Compilation Error

[rakim0]

Hi, I am not able to compile the library because of -Wstrict-prototypes. I could add the prototypes but just wanted to know if this is due to a newer version of clang. (or just skill issue ;-;)

I'm on Fedora 39 and here's the output for clang --version

❯ clang --version
clang version 17.0.6 (Fedora 17.0.6-2.fc39)
Target: x86_64-redhat-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

make output:

~/programming_stuff/repos_ext/syscall_intercept
❯ make                     
[  0%] Built target check_whitespace
[  0%] Building CXX object CMakeFiles/cpp_test.dir/src/cpp_compile_test.cc.o
[  1%] Building C object CMakeFiles/cpp_test.dir/src/cpp_compile_mock.c.o
[  2%] Linking CXX executable cpp_test
[  2%] Built target cpp_test
[  2%] Built target cstyle
[  2%] Building C object CMakeFiles/syscall_intercept_base_c.dir/src/disasm_wrapper.c.o
/home/rakim/programming_stuff/repos_ext/syscall_intercept/repo/src/disasm_wrapper.c:66:14: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
   66 | nop_vsnprintf()
      |              ^
      |               void
1 error generated.
make[2]: *** [CMakeFiles/syscall_intercept_base_c.dir/build.make:76: CMakeFiles/syscall_intercept_base_c.dir/src/disasm_wrapper.c.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:300: CMakeFiles/syscall_intercept_base_c.dir/all] Error 2
make: *** [Makefile:146: all] Error 2

cmake output:

~/programming_stuff/repos_ext/syscall_intercept
❯ cmake repo -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=clang
CMake Deprecation Warning at CMakeLists.txt:32 (cmake_minimum_required):
  Compatibility with CMake < 3.5 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


-- The C compiler identification is Clang 17.0.6
-- The ASM compiler identification is Clang with GNU-like command-line
-- Found assembler: /usr/lib64/ccache/clang
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/lib64/ccache/clang - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Performing Test HAS_WERROR
-- Performing Test HAS_WERROR - Success
-- Performing Test HAS_WALL
-- Performing Test HAS_WALL - Success
-- Performing Test HAS_WEXTRA
-- Performing Test HAS_WEXTRA - Success
-- Performing Test HAS_PEDANTIC
-- Performing Test HAS_PEDANTIC - Success
-- Performing Test HAS_NOMFI
-- Performing Test HAS_NOMFI - Success
-- Performing Test HAS_NO9099
-- Performing Test HAS_NO9099 - Failed
-- Performing Test LINKER_HAS_NOSTDLIB
-- Performing Test LINKER_HAS_NOSTDLIB - Success
-- Performing Test HAS_WLFATAL
-- Performing Test HAS_WLFATAL - Success
-- Performing Test HAS_NOUNUSEDARG
-- Performing Test HAS_NOUNUSEDARG - Success
-- Performing Test HAS_ARG_PIE
-- Performing Test HAS_ARG_PIE - Success
-- Performing Test HAS_ARG_NOPIE
-- Performing Test HAS_ARG_NOPIE - Success
-- Performing Test HAS_ARG_NO_PIE
-- Performing Test HAS_ARG_NO_PIE - Success
-- Performing Test HAS_GCC_ATTR_CONSTR
-- Performing Test HAS_GCC_ATTR_CONSTR - Success
-- Performing Test HAS_GCC_PRAGMA_SYSH
-- Performing Test HAS_GCC_PRAGMA_SYSH - Success
-- Looking for include file elf.h
-- Looking for include file elf.h - found
-- Looking for dladdr
-- Looking for dladdr - found
-- Looking for a CXX compiler
-- Looking for a CXX compiler - /usr/lib64/ccache/c++
-- The CXX compiler identification is GNU 13.2.1
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/lib64/ccache/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found Perl: /usr/bin/perl (found version "5.38.2") 
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE  
-- Configuring done (2.8s)
-- Generating done (0.1s)
-- Build files have been written to: /home/rakim/programming_stuff/repos_ext/syscall_intercept

[GBuella]

Good catch! It is not your skill issue, it should be something:

static int
nop_vsnprintf(char *str, size_t size, const char *format, va_list ap)

See the definition in capstone:
https://github.com/capstone-engine/capstone/blob/8f9a337dfaad6bddec3fb8dc1cccae17a3736b93/include/capstone/capstone.h#L243

[rakim0]

Ah so to compile it for now, I just changed the function to the definition given below.
Just used printf/vfprintf to get rid of the unused parameters error (it seems very hacky so am curious how to deal with that error in a dummy function?).

I also had to change main() -> main(void) in two different files: /test/test_clone_thread.c and /test/filter_test.c

and finally it compiles ^^

static int
nop_vsnprintf(char *str, size_t size, const char *format, va_list ap)
{
	printf("%s %lu %s", str, size, format);
	vfprintf(stderr, format, ap);
	return 0;
}

P.S. Sorry for responding so late, just got done with finals week.