Move dlfcn.h availability check to platform_common.h (bytecodealliance#1134)

Author: yamt

core/shared/platform/include/platform_common.h

@@ -65,6 +65,14 @@ BH_VPRINTF(const char *format, va_list ap);
 #define NULL (void *)0
 #endif
 
+#if !defined(BH_HAS_DLFCN)
+#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE)
+#define BH_HAS_DLFCN 1
+#else
+#define BH_HAS_DLFCN 0
+#endif
+#endif
+
 #ifndef __cplusplus
 
 #ifndef true

core/shared/platform/nuttx/platform_internal.h

@@ -41,6 +41,12 @@ typedef pthread_t korp_thread;
 #define os_printf printf
 #define os_vprintf vprintf
 
+#if defined(CONFIG_LIBC_DLFCN)
+#define BH_HAS_DLFCN 1
+#else
+#define BH_HAS_DLFCN 0
+#endif
+
 /* On NuttX, time_t is uint32_t */
 #define BH_TIME_T_MAX 0xffffffff
 

product-mini/platforms/posix/main.c

@@ -8,14 +8,15 @@
 #endif
 #include <stdlib.h>
 #include <string.h>
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE)
-#include <dlfcn.h>
-#endif
 
 #include "bh_platform.h"
 #include "bh_read_file.h"
 #include "wasm_export.h"
 
+#if BH_HAS_DLFCN
+#include <dlfcn.h>
+#endif
+
 static int app_argc;
 static char **app_argv;
 
@@ -47,7 +48,7 @@ print_help()
     printf("                         for example:\n");
     printf("                           --addr-pool=1.2.3.4/15,2.3.4.5/16\n");
 #endif
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE)
+#if BH_HAS_DLFCN
     printf("  --native-lib=<lib>     Register native libraries to the WASM module, which\n");
     printf("                         are shared object (.so) files, for example:\n");
     printf("                           --native-lib=test1.so --native-lib=test2.so\n");
@@ -182,7 +183,7 @@ validate_env_str(char *env)
 }
 #endif
 
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE)
+#if BH_HAS_DLFCN
 typedef uint32 (*get_native_lib_func)(char **p_module_name,
                                       NativeSymbol **p_native_symbols);
 
@@ -232,7 +233,7 @@ load_and_register_native_libs(const char **native_lib_list,
 
     return native_handle_count;
 }
-#endif /* end of defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) */
+#endif /* BH_HAS_DLFCN */
 
 #if WASM_ENABLE_MULTI_MODULE != 0
 static char *
@@ -309,7 +310,7 @@ main(int argc, char *argv[])
     const char *addr_pool[8] = { NULL };
     uint32 addr_pool_size = 0;
 #endif
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE)
+#if BH_HAS_DLFCN
     const char *native_lib_list[8] = { NULL };
     uint32 native_lib_count = 0;
     void *native_handle_list[8] = { NULL };
@@ -403,7 +404,7 @@ main(int argc, char *argv[])
             }
         }
 #endif /* WASM_ENABLE_LIBC_WASI */
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE)
+#if BH_HAS_DLFCN
         else if (!strncmp(argv[0], "--native-lib=", 13)) {
             if (argv[0][13] == '\0')
                 return print_help();
@@ -485,7 +486,7 @@ main(int argc, char *argv[])
     bh_log_set_verbose_level(log_verbose_level);
 #endif
 
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE)
+#if BH_HAS_DLFCN
     native_handle_count = load_and_register_native_libs(
         native_lib_list, native_lib_count, native_handle_list);
 #endif
@@ -564,7 +565,7 @@ main(int argc, char *argv[])
         os_munmap(wasm_file_buf, wasm_file_size);
 
 fail1:
-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE)
+#if BH_HAS_DLFCN
     /* unload the native libraries */
     for (native_handle_idx = 0; native_handle_idx < native_handle_count;
          native_handle_idx++)