rpi_gpio.so compiled as 32-bit on 64-bit system

[vanne]

On Ubuntu 20.04 LTS 64-bit, the gem installs fine but rpi_gpio.so is compiled as a 32-bit lib.

"rpi_gpio.so: wrong ELF class: ELFCLASS32"

ubuntu@rpi4:~/test$ uname -a
Linux rpi4 5.4.0-1018-raspi #20-Ubuntu SMP Sun Sep 6 05:11:16 UTC 2020 aarch64 aarch64 aarch64 GNU/Linux
ubuntu@rpi4:~/test$ rbenv version
2.7.1 (set by /home/ubuntu/.rbenv/version)
ubuntu@rpi4:~/test$ 

ubuntu@rpi4:~/test$ cat test.rb 
require 'rpi_gpio'
ubuntu@rpi4:~/test$ bundle exec ruby test.rb 
Traceback (most recent call last):
	3: from test.rb:1:in `<main>'
	2: from test.rb:1:in `require'
	1: from /home/ubuntu/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rpi_gpio-0.5.0/lib/rpi_gpio.rb:1:in `<top (required)>'
/home/ubuntu/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rpi_gpio-0.5.0/lib/rpi_gpio.rb:1:in `require': /home/ubuntu/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rpi_gpio-0.5.0/lib/rpi_gpio/rpi_gpio.so: wrong ELF class: ELFCLASS32 - /home/ubuntu/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rpi_gpio-0.5.0/lib/rpi_gpio/rpi_gpio.so (LoadError)
ubuntu@rpi4:~/test$

[vanne]

When checking out the repository and build manually, things are fine:

ubuntu@rpi4:~$ git clone https://github.com/ClockVapor/rpi_gpio.git
Cloning into 'rpi_gpio'...
remote: Enumerating objects: 110, done.
remote: Counting objects: 100% (110/110), done.
remote: Compressing objects: 100% (65/65), done.
remote: Total 426 (delta 51), reused 73 (delta 27), pack-reused 316
Receiving objects: 100% (426/426), 241.55 KiB | 1.05 MiB/s, done.
Resolving deltas: 100% (242/242), done.
ubuntu@rpi4:~$ cd rpi_gpio/ext/rpi_gpio/
ubuntu@rpi4:~/rpi_gpio/ext/rpi_gpio$ ruby extconf.rb 
creating Makefile
ubuntu@rpi4:~/rpi_gpio/ext/rpi_gpio$ make
<snip>
linking shared-object rpi_gpio/rpi_gpio.so
ubuntu@rpi4:~/rpi_gpio/ext/rpi_gpio$ file rpi_gpio.so 
rpi_gpio.so: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, BuildID[sha1]=9d7712484c2ed99db38dc4aa316ed47cc853e18a, with debug_info, not stripped
ubuntu@rpi4:~/rpi_gpio/ext/rpi_gpio$ make install
/usr/bin/install -c -m 0755 rpi_gpio.so /home/ubuntu/.rbenv/versions/2.7.1/lib/ruby/site_ruby/2.7.0/aarch64-linux/rpi_gpio
ubuntu@rpi4:~/rpi_gpio/ext/rpi_gpio$ 

[phykos]

Encountered this error because I am on AArch64 too.
So far, on 5 years of Ruby I never seen such error.

edit: tried to build the gem myself and I got this:

compiling c_gpio.c
c_gpio.c: In function ‘setup’:
c_gpio.c:134:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  134 |     if ((uint32_t)gpio_mem % PAGE_SIZE)
      |         ^
c_gpio.c:135:34: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  135 |         gpio_mem += PAGE_SIZE - ((uint32_t)gpio_mem % PAGE_SIZE);
      |                                  ^
c_gpio.c: At top level:
cc1: note: unrecognized command-line option ‘-Wno-self-assign’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-parentheses-equality’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-constant-logical-operand’ may have been intended to silence earlier diagnostics
compiling common.c
compiling cpuinfo.c
cpuinfo.c: In function ‘get_rpi_info’:
cpuinfo.c:86:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   86 |                case '0': info->type = "Model A"; info->p1_revision = 2; break;
      |                                     ^
cpuinfo.c:87:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   87 |                case '1': info->type = "Model B"; info->p1_revision = 2; break;
      |                                     ^
cpuinfo.c:88:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   88 |                case '2': info->type = "Model A+"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:89:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   89 |                case '3': info->type = "Model B+"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:90:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   90 |                case '4': info->type = "Pi 2 Model B"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:91:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   91 |                case '5': info->type = "Alpha"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:92:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   92 |                case '6': info->type = "Compute Module 1"; info->p1_revision = 0; break;
      |                                     ^
cpuinfo.c:93:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   93 |                case '8': info->type = "Pi 3 Model B"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:94:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   94 |                case '9': info->type = "Zero"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:95:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   95 |                case 'a': info->type = "Compute Module 3"; info->p1_revision = 0; break;
      |                                     ^
cpuinfo.c:96:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   96 |                case 'c': info->type = "Zero W"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:97:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   97 |                case 'd': info->type = "Pi 3 Model B+"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:98:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   98 |                case 'e': info->type = "Pi 3 Model A+"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:99:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   99 |                default : info->type = "Unknown"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:103:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  103 |                case '0': info->type = "Compute Module 3+"; info->p1_revision = 0; break;
      |                                     ^
cpuinfo.c:104:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  104 |                case '1': info->type = "Pi 4 Model B"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:105:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  105 |                default : info->type = "Unknown"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:107:30: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  107 |          default: info->type = "Unknown"; info->p1_revision = 3; break;
      |                              ^
cpuinfo.c:111:36: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  111 |          case '0': info->processor = "BCM2835"; break;
      |                                    ^
cpuinfo.c:112:36: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  112 |          case '1': info->processor = "BCM2836"; break;
      |                                    ^
cpuinfo.c:113:36: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  113 |          case '2': info->processor = "BCM2837"; break;
      |                                    ^
cpuinfo.c:114:36: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  114 |          case '3': info->processor = "BCM2711"; break;
      |                                    ^
cpuinfo.c:115:36: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  115 |          default : info->processor = "Unknown"; break;
      |                                    ^
cpuinfo.c:118:39: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  118 |          case '0': info->manufacturer = "Sony"; break;
      |                                       ^
cpuinfo.c:119:39: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  119 |          case '1': info->manufacturer = "Egoman"; break;
      |                                       ^
cpuinfo.c:120:39: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  120 |          case '2': info->manufacturer = "Embest"; break;
      |                                       ^
cpuinfo.c:121:39: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  121 |          case '3': info->manufacturer = "Sony Japan"; break;
      |                                       ^
cpuinfo.c:122:39: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  122 |          case '4': info->manufacturer = "Embest"; break;
      |                                       ^
cpuinfo.c:123:39: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  123 |          case '5': info->manufacturer = "Stadium"; break;
      |                                       ^
cpuinfo.c:124:39: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  124 |          default : info->manufacturer = "Unknown"; break;
      |                                       ^
cpuinfo.c:127:28: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  127 |          case 0: info->ram = "256M"; break;
      |                            ^
cpuinfo.c:128:28: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  128 |          case 1: info->ram = "512M"; break;
      |                            ^
cpuinfo.c:129:28: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  129 |          case 2: info->ram = "1G"; break;
      |                            ^
cpuinfo.c:130:28: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  130 |          case 3: info->ram = "2G"; break;
      |                            ^
cpuinfo.c:131:28: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  131 |          case 4: info->ram = "4G"; break;
      |                            ^
cpuinfo.c:132:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  132 |          default: info->ram = "Unknown"; break;
      |                             ^
cpuinfo.c:136:17: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  136 |       info->ram = "Unknown";
      |                 ^
cpuinfo.c:137:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  137 |       info->manufacturer = "Unknown";
      |                          ^
cpuinfo.c:138:23: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  138 |       info->processor = "Unknown";
      |                       ^
cpuinfo.c:139:18: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  139 |       info->type = "Unknown";
      |                  ^
cpuinfo.c:143:28: warning: format ‘%llx’ expects argument of type ‘long long unsigned int *’, but argument 3 has type ‘uint64_t *’ {aka ‘long unsigned int *’} [-Wformat=]
  143 |       sscanf(revision, "%llx", &rev);
      |                         ~~~^   ~~~~
      |                            |   |
      |                            |   uint64_t * {aka long unsigned int *}
      |                            long long unsigned int *
      |                         %lx
cpuinfo.c:147:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  147 |          info->type = "Model B";
      |                     ^
cpuinfo.c:149:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  149 |          info->ram = "256M";
      |                    ^
cpuinfo.c:150:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  150 |          info->manufacturer = "Egoman";
      |                             ^
cpuinfo.c:151:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  151 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:153:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  153 |          info->type = "Model B";
      |                     ^
cpuinfo.c:155:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  155 |          info->ram = "256M";
      |                    ^
cpuinfo.c:156:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  156 |          info->manufacturer = "Sony UK";
      |                             ^
cpuinfo.c:157:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  157 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:159:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  159 |          info->type = "Model B";
      |                     ^
cpuinfo.c:161:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  161 |          info->ram = "256M";
      |                    ^
cpuinfo.c:162:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  162 |          info->manufacturer = "Qisda";
      |                             ^
cpuinfo.c:163:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  163 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:165:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  165 |          info->type = "Model B";
      |                     ^
cpuinfo.c:167:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  167 |          info->ram = "256M";
      |                    ^
cpuinfo.c:168:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  168 |          info->manufacturer = "Egoman";
      |                             ^
cpuinfo.c:169:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  169 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:171:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  171 |          info->type = "Model A";
      |                     ^
cpuinfo.c:173:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  173 |          info->ram = "256M";
      |                    ^
cpuinfo.c:174:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  174 |          info->manufacturer = "Egoman";
      |                             ^
cpuinfo.c:175:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  175 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:177:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  177 |          info->type = "Model A";
      |                     ^
cpuinfo.c:179:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  179 |          info->ram = "256M";
      |                    ^
cpuinfo.c:180:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  180 |          info->manufacturer = "Sony UK";
      |                             ^
cpuinfo.c:181:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  181 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:183:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  183 |          info->type = "Model A";
      |                     ^
cpuinfo.c:185:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  185 |          info->ram = "256M";
      |                    ^
cpuinfo.c:186:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  186 |          info->manufacturer = "Qisda";
      |                             ^
cpuinfo.c:187:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  187 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:189:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  189 |          info->type = "Model B";
      |                     ^
cpuinfo.c:191:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  191 |          info->ram = "512M";
      |                    ^
cpuinfo.c:192:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  192 |          info->manufacturer = "Egoman";
      |                             ^
cpuinfo.c:193:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  193 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:195:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  195 |          info->type = "Model B";
      |                     ^
cpuinfo.c:197:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  197 |          info->ram = "512M";
      |                    ^
cpuinfo.c:198:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  198 |          info->manufacturer = "Sony UK";
      |                             ^
cpuinfo.c:199:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  199 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:201:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  201 |          info->type = "Model B";
      |                     ^
cpuinfo.c:203:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  203 |          info->ram = "512M";
      |                    ^
cpuinfo.c:204:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  204 |          info->manufacturer = "Qisda";
      |                             ^
cpuinfo.c:205:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  205 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:207:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  207 |          info->type = "Model B+";
      |                     ^
cpuinfo.c:209:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  209 |          info->ram = "512M";
      |                    ^
cpuinfo.c:210:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  210 |          info->manufacturer = "Sony UK";
      |                             ^
cpuinfo.c:211:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  211 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:213:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  213 |          info->type = "Compute Module 1";
      |                     ^
cpuinfo.c:215:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  215 |          info->ram = "512M";
      |                    ^
cpuinfo.c:216:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  216 |          info->manufacturer = "Sony UK";
      |                             ^
cpuinfo.c:217:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  217 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:219:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  219 |          info->type = "Model A+";
      |                     ^
cpuinfo.c:221:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  221 |          info->ram = "256M";
      |                    ^
cpuinfo.c:222:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  222 |          info->manufacturer = "Sony UK";
      |                             ^
cpuinfo.c:223:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  223 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:225:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  225 |          info->type = "Model B+";
      |                     ^
cpuinfo.c:227:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  227 |          info->ram = "512M";
      |                    ^
cpuinfo.c:228:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  228 |          info->manufacturer = "Embest";
      |                             ^
cpuinfo.c:229:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  229 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:231:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  231 |          info->type = "Compute Module 1";
      |                     ^
cpuinfo.c:233:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  233 |          info->ram = "512M";
      |                    ^
cpuinfo.c:234:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  234 |          info->manufacturer = "Embest";
      |                             ^
cpuinfo.c:235:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  235 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:237:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  237 |          info->type = "Model A+";
      |                     ^
cpuinfo.c:239:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  239 |          info->ram = "Unknown";
      |                    ^
cpuinfo.c:240:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  240 |          info->manufacturer = "Embest";
      |                             ^
cpuinfo.c:241:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  241 |          info->processor = "BCM2835";compiling c_gpio.c
c_gpio.c: In function ‘setup’:
c_gpio.c:134:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  134 |     if ((uint32_t)gpio_mem % PAGE_SIZE)
      |         ^
c_gpio.c:135:34: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  135 |         gpio_mem += PAGE_SIZE - ((uint32_t)gpio_mem % PAGE_SIZE);
      |                                  ^
c_gpio.c: At top level:
cc1: note: unrecognized command-line option ‘-Wno-self-assign’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-parentheses-equality’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-constant-logical-operand’ may have been intended to silence earlier diagnostics
compiling common.c
compiling cpuinfo.c
cpuinfo.c: In function ‘get_rpi_info’:
cpuinfo.c:86:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   86 |                case '0': info->type = "Model A"; info->p1_revision = 2; break;
      |                                     ^
cpuinfo.c:87:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   87 |                case '1': info->type = "Model B"; info->p1_revision = 2; break;
      |                                     ^
cpuinfo.c:88:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   88 |                case '2': info->type = "Model A+"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:89:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   89 |                case '3': info->type = "Model B+"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:90:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   90 |                case '4': info->type = "Pi 2 Model B"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:91:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   91 |                case '5': info->type = "Alpha"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:92:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   92 |                case '6': info->type = "Compute Module 1"; info->p1_revision = 0; break;
      |                                     ^
cpuinfo.c:93:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   93 |                case '8': info->type = "Pi 3 Model B"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:94:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   94 |                case '9': info->type = "Zero"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:95:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   95 |                case 'a': info->type = "Compute Module 3"; info->p1_revision = 0; break;
      |                                     ^
cpuinfo.c:96:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   96 |                case 'c': info->type = "Zero W"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:97:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   97 |                case 'd': info->type = "Pi 3 Model B+"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:98:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   98 |                case 'e': info->type = "Pi 3 Model A+"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:99:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   99 |                default : info->type = "Unknown"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:103:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  103 |                case '0': info->type = "Compute Module 3+"; info->p1_revision = 0; break;
      |                                     ^
cpuinfo.c:104:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  104 |                case '1': info->type = "Pi 4 Model B"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:105:37: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  105 |                default : info->type = "Unknown"; info->p1_revision = 3; break;
      |                                     ^
cpuinfo.c:107:30: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  107 |          default: info->type = "Unknown"; info->p1_revision = 3; break;
      |                              ^
cpuinfo.c:111:36: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  111 |          case '0': info->processor = "BCM2835"; break;
      |                                    ^
cpuinfo.c:112:36: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  112 |          case '1': info->processor = "BCM2836"; break;
      |                                    ^
cpuinfo.c:113:36: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  113 |          case '2': info->processor = "BCM2837"; break;
      |                                    ^
cpuinfo.c:114:36: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  114 |          case '3': info->processor = "BCM2711"; break;
      |                                    ^
cpuinfo.c:115:36: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  115 |          default : info->processor = "Unknown"; break;
      |                                    ^
cpuinfo.c:118:39: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  118 |          case '0': info->manufacturer = "Sony"; break;
      |                                       ^
cpuinfo.c:119:39: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  119 |          case '1': info->manufacturer = "Egoman"; break;
      |                                       ^
cpuinfo.c:120:39: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  120 |          case '2': info->manufacturer = "Embest"; break;
      |                                       ^
cpuinfo.c:121:39: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  121 |          case '3': info->manufacturer = "Sony Japan"; break;
      |                                       ^
cpuinfo.c:122:39: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  122 |          case '4': info->manufacturer = "Embest"; break;
      |                                       ^
cpuinfo.c:123:39: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  123 |          case '5': info->manufacturer = "Stadium"; break;
      |                                       ^
cpuinfo.c:124:39: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  124 |          default : info->manufacturer = "Unknown"; break;
      |                                       ^
cpuinfo.c:127:28: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  127 |          case 0: info->ram = "256M"; break;
      |                            ^
cpuinfo.c:128:28: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  128 |          case 1: info->ram = "512M"; break;
      |                            ^
cpuinfo.c:129:28: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  129 |          case 2: info->ram = "1G"; break;
      |                            ^
cpuinfo.c:130:28: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  130 |          case 3: info->ram = "2G"; break;
      |                            ^
cpuinfo.c:131:28: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  131 |          case 4: info->ram = "4G"; break;
      |                            ^
cpuinfo.c:132:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  132 |          default: info->ram = "Unknown"; break;
      |                             ^
cpuinfo.c:136:17: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  136 |       info->ram = "Unknown";
      |                 ^
cpuinfo.c:137:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  137 |       info->manufacturer = "Unknown";
      |                          ^
cpuinfo.c:138:23: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  138 |       info->processor = "Unknown";
      |                       ^
cpuinfo.c:139:18: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  139 |       info->type = "Unknown";
      |                  ^
cpuinfo.c:143:28: warning: format ‘%llx’ expects argument of type ‘long long unsigned int *’, but argument 3 has type ‘uint64_t *’ {aka ‘long unsigned int *’} [-Wformat=]
  143 |       sscanf(revision, "%llx", &rev);
      |                         ~~~^   ~~~~
      |                            |   |
      |                            |   uint64_t * {aka long unsigned int *}
      |                            long long unsigned int *
      |                         %lx
cpuinfo.c:147:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  147 |          info->type = "Model B";
      |                     ^
cpuinfo.c:149:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  149 |          info->ram = "256M";
      |                    ^
cpuinfo.c:150:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  150 |          info->manufacturer = "Egoman";
      |                             ^
cpuinfo.c:151:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  151 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:153:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  153 |          info->type = "Model B";
      |                     ^
cpuinfo.c:155:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  155 |          info->ram = "256M";
      |                    ^
cpuinfo.c:156:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  156 |          info->manufacturer = "Sony UK";
      |                             ^
cpuinfo.c:157:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  157 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:159:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  159 |          info->type = "Model B";
      |                     ^
cpuinfo.c:161:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  161 |          info->ram = "256M";
      |                    ^
cpuinfo.c:162:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  162 |          info->manufacturer = "Qisda";
      |                             ^
cpuinfo.c:163:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  163 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:165:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  165 |          info->type = "Model B";
      |                     ^
cpuinfo.c:167:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  167 |          info->ram = "256M";
      |                    ^
cpuinfo.c:168:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  168 |          info->manufacturer = "Egoman";
      |                             ^
cpuinfo.c:169:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  169 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:171:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  171 |          info->type = "Model A";
      |                     ^
cpuinfo.c:173:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  173 |          info->ram = "256M";
      |                    ^
cpuinfo.c:174:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  174 |          info->manufacturer = "Egoman";
      |                             ^
cpuinfo.c:175:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  175 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:177:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  177 |          info->type = "Model A";
      |                     ^
cpuinfo.c:179:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  179 |          info->ram = "256M";
      |                    ^
cpuinfo.c:180:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  180 |          info->manufacturer = "Sony UK";
      |                             ^
cpuinfo.c:181:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  181 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:183:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  183 |          info->type = "Model A";
      |                     ^
cpuinfo.c:185:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  185 |          info->ram = "256M";
      |                    ^
cpuinfo.c:186:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  186 |          info->manufacturer = "Qisda";
      |                             ^
cpuinfo.c:187:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  187 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:189:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  189 |          info->type = "Model B";
      |                     ^
cpuinfo.c:191:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  191 |          info->ram = "512M";
      |                    ^
cpuinfo.c:192:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  192 |          info->manufacturer = "Egoman";
      |                             ^
cpuinfo.c:193:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  193 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:195:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  195 |          info->type = "Model B";
      |                     ^
cpuinfo.c:197:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  197 |          info->ram = "512M";
      |                    ^
cpuinfo.c:198:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  198 |          info->manufacturer = "Sony UK";
      |                             ^
cpuinfo.c:199:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  199 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:201:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  201 |          info->type = "Model B";
      |                     ^
cpuinfo.c:203:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  203 |          info->ram = "512M";
      |                    ^
cpuinfo.c:204:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  204 |          info->manufacturer = "Qisda";
      |                             ^
cpuinfo.c:205:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  205 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:207:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  207 |          info->type = "Model B+";
      |                     ^
cpuinfo.c:209:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  209 |          info->ram = "512M";
      |                    ^
cpuinfo.c:210:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  210 |          info->manufacturer = "Sony UK";
      |                             ^
cpuinfo.c:211:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  211 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:213:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  213 |          info->type = "Compute Module 1";
      |                     ^
cpuinfo.c:215:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  215 |          info->ram = "512M";
      |                    ^
cpuinfo.c:216:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  216 |          info->manufacturer = "Sony UK";
      |                             ^
cpuinfo.c:217:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  217 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:219:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  219 |          info->type = "Model A+";
      |                     ^
cpuinfo.c:221:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  221 |          info->ram = "256M";
      |                    ^
cpuinfo.c:222:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  222 |          info->manufacturer = "Sony UK";
      |                             ^
cpuinfo.c:223:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  223 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:225:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  225 |          info->type = "Model B+";
      |                     ^
cpuinfo.c:227:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  227 |          info->ram = "512M";
      |                    ^
cpuinfo.c:228:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  228 |          info->manufacturer = "Embest";
      |                             ^
cpuinfo.c:229:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  229 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:231:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  231 |          info->type = "Compute Module 1";
      |                     ^
cpuinfo.c:233:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  233 |          info->ram = "512M";
      |                    ^
cpuinfo.c:234:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  234 |          info->manufacturer = "Embest";
      |                             ^
cpuinfo.c:235:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  235 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c:237:21: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  237 |          info->type = "Model A+";
      |                     ^
cpuinfo.c:239:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  239 |          info->ram = "Unknown";
      |                    ^
cpuinfo.c:240:29: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  240 |          info->manufacturer = "Embest";
      |                             ^
cpuinfo.c:241:26: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  241 |          info->processor = "BCM2835";
      |                          ^
cpuinfo.c: At top level:
cc1: note: unrecognized command-line option ‘-Wno-self-assign’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-parentheses-equality’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-constant-logical-operand’ may have been intended to silence earlier diagnostics
compiling rb_gpio.c
compiling rb_pwm.c
compiling rpi_gpio.c
compiling soft_pwm.c
soft_pwm.c: In function ‘pwm_thread’:
soft_pwm.c:95:7: warning: function might be candidate for attribute ‘noreturn’ [-Wsuggest-attribute=noreturn]
   95 | void *pwm_thread(void *threadarg)
      |       ^~~~~~~~~~
soft_pwm.c: At top level:
cc1: note: unrecognized command-line option ‘-Wno-self-assign’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-parentheses-equality’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-constant-logical-operand’ may have been intended to silence earlier diagnostics
linking shared-object rpi_gpio/rpi_gpio.so
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:37: multiple definition of `gpio_mode'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:37: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:43: multiple definition of `rpiinfo'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:43: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:41: multiple definition of `pin_to_gpio'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:41: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:45: multiple definition of `module_setup'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:45: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:44: multiple definition of `setup_error'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:44: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:42: multiple definition of `gpio_direction'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:42: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:40: multiple definition of `pin_to_gpio_rev3'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:40: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:39: multiple definition of `pin_to_gpio_rev2'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:39: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:38: multiple definition of `pin_to_gpio_rev1'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:38: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:42: multiple definition of `gpio_direction'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:42: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:45: multiple definition of `module_setup'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:45: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:44: multiple definition of `setup_error'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:44: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:43: multiple definition of `rpiinfo'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:43: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:41: multiple definition of `pin_to_gpio'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:41: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:40: multiple definition of `pin_to_gpio_rev3'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:40: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:39: multiple definition of `pin_to_gpio_rev2'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:39: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:38: multiple definition of `pin_to_gpio_rev1'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:38: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:37: multiple definition of `gpio_mode'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:37: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:45: multiple definition of `module_setup'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:45: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:44: multiple definition of `setup_error'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:44: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:43: multiple definition of `rpiinfo'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:43: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:42: multiple definition of `gpio_direction'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:42: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:41: multiple definition of `pin_to_gpio'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:41: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:40: multiple definition of `pin_to_gpio_rev3'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:40: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:39: multiple definition of `pin_to_gpio_rev2'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:39: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:38: multiple definition of `pin_to_gpio_rev1'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:38: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:37: multiple definition of `gpio_mode'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:37: first defined here
collect2: error: ld returned 1 exit status
make: *** [Makefile:262: rpi_gpio.so] Error 1

      |                          ^
cpuinfo.c: At top level:
cc1: note: unrecognized command-line option ‘-Wno-self-assign’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-parentheses-equality’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-constant-logical-operand’ may have been intended to silence earlier diagnostics
compiling rb_gpio.c
compiling rb_pwm.c
compiling rpi_gpio.c
compiling soft_pwm.c
soft_pwm.c: In function ‘pwm_thread’:
soft_pwm.c:95:7: warning: function might be candidate for attribute ‘noreturn’ [-Wsuggest-attribute=noreturn]
   95 | void *pwm_thread(void *threadarg)
      |       ^~~~~~~~~~
soft_pwm.c: At top level:
cc1: note: unrecognized command-line option ‘-Wno-self-assign’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-parentheses-equality’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-constant-logical-operand’ may have been intended to silence earlier diagnostics
linking shared-object rpi_gpio/rpi_gpio.so
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:37: multiple definition of `gpio_mode'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:37: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:43: multiple definition of `rpiinfo'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:43: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:41: multiple definition of `pin_to_gpio'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:41: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:45: multiple definition of `module_setup'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:45: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:44: multiple definition of `setup_error'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:44: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:42: multiple definition of `gpio_direction'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:42: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:40: multiple definition of `pin_to_gpio_rev3'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:40: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:39: multiple definition of `pin_to_gpio_rev2'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:39: first defined here
/usr/bin/ld: rb_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:38: multiple definition of `pin_to_gpio_rev1'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:38: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:42: multiple definition of `gpio_direction'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:42: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:45: multiple definition of `module_setup'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:45: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:44: multiple definition of `setup_error'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:44: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:43: multiple definition of `rpiinfo'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:43: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:41: multiple definition of `pin_to_gpio'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:41: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:40: multiple definition of `pin_to_gpio_rev3'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:40: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:39: multiple definition of `pin_to_gpio_rev2'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:39: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:38: multiple definition of `pin_to_gpio_rev1'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:38: first defined here
/usr/bin/ld: rb_pwm.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:37: multiple definition of `gpio_mode'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:37: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:45: multiple definition of `module_setup'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:45: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:44: multiple definition of `setup_error'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:44: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:43: multiple definition of `rpiinfo'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:43: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:42: multiple definition of `gpio_direction'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:42: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:41: multiple definition of `pin_to_gpio'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:41: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:40: multiple definition of `pin_to_gpio_rev3'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:40: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:39: multiple definition of `pin_to_gpio_rev2'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:39: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:38: multiple definition of `pin_to_gpio_rev1'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:38: first defined here
/usr/bin/ld: rpi_gpio.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:37: multiple definition of `gpio_mode'; common.o:/home/g/Public/software/rpi_gpio/ext/rpi_gpio/common.h:37: first defined here
collect2: error: ld returned 1 exit status
make: *** [Makefile:262: rpi_gpio.so] Error 1

[chris-clifton]

Specifying the git repo did it for me and it correctly compiled as 64 bit.

1. Delete Gemfile.lock
2. Change Gemfile to read: gem 'rpi_gpio', git: 'git@github.com:ClockVapor/rpi_gpio.git'
3. Run bundle install