Make scons 'loadable_module' output consistent with make output location...

test/module/src/program.c

+#include <stdio.h>
+#include <stdlib.h>
+
+#if defined(PLATFORM_WIN)
+#include <windows.h>
+#elif defined(PLATFORM_MAC) || defined(PLATFORM_LINUX)
+#include <dlfcn.h>
+#include <libgen.h>
+#include <string.h>
+#include <sys/param.h>
+#define MAX_PATH PATH_MAX
+#endif
+
+#if defined(PLATFORM_WIN)
+#define MODULE_SUFFIX ".dll"
+#elif defined(PLATFORM_MAC)
+#define MODULE_SUFFIX ".dylib"
+#elif defined(PLATFORM_LINUX)
+#define MODULE_SUFFIX ".so"
+#endif
+
+typedef void (*module_symbol)(void);
+char bin_path[MAX_PATH + 1];
+
+
+void CallModule(const char* module) {
+  char module_path[MAX_PATH + 1];
+  const char* module_function = "module_main";
+  module_symbol funcptr;
+#if defined(PLATFORM_WIN)
+  HMODULE dl;
+  char drive[_MAX_DRIVE];
+  char dir[_MAX_DIR];
+
+  if (_splitpath_s(bin_path, drive, _MAX_DRIVE, dir, _MAX_DIR,
+                    NULL, 0, NULL, 0)) {
+    fprintf(stderr, "Failed to split executable path.\n");
+    return;
+  }
+  if (_makepath_s(module_path, MAX_PATH, drive, dir, module, MODULE_SUFFIX)) {
+    fprintf(stderr, "Failed to calculate module path.\n");
+    return;
+  }
+
+  dl = LoadLibrary(module_path);
+  if (!dl) {
+    fprintf(stderr, "Failed to open module: %s\n", module_path);
+    return;
+  }
+
+  funcptr = (module_symbol) GetProcAddress(dl, module_function);
+  if (!funcptr) {
+    fprintf(stderr, "Failed to find symbol: %s\n", module_function);
+    return;
+  }
+  funcptr();
+
+  FreeLibrary(dl);
+#elif defined(PLATFORM_MAC) || defined(PLATFORM_LINUX)
+  void* dl;
+  char* path_copy = strdup(bin_path);
+  char* bin_dir = dirname(path_copy);
+  int path_size = snprintf(module_path, MAX_PATH, "%s/%s%s", bin_dir, module,
+                           MODULE_SUFFIX);
+  free(path_copy);
+  if (path_size < 0 || path_size > MAX_PATH) {
+    fprintf(stderr, "Failed to calculate module path.\n");
+    return;
+  }
+  module_path[path_size] = 0;
+
+  dl = dlopen(module_path, RTLD_LAZY);
+  if (!dl) {
+    fprintf(stderr, "Failed to open module: %s\n", module_path);
+    return;
+  }
+
+  funcptr = dlsym(dl, module_function);
+  if (!funcptr) {
+    fprintf(stderr, "Failed to find symbol: %s\n", module_function);
+    return;
+  }
+  funcptr();
+
+  dlclose(dl);
+#endif
+}
+
+int main(int argc, char *argv[])
+{
+  fprintf(stdout, "Hello from program.c\n");
+  fflush(stdout);
+
+#if defined(PLATFORM_WIN)
+  if (!GetModuleFileName(NULL, bin_path, MAX_PATH)) {
+    fprintf(stderr, "Failed to determine executable path.\n");
+    return;
+  }
+#elif defined(PLATFORM_MAC) || defined(PLATFORM_LINUX)
+  // Using argv[0] should be OK here since we control how the tests run, and
+  // can avoid exec and such issues that make it unreliable.
+  if (!realpath(argv[0], bin_path)) {
+    fprintf(stderr, "Failed to determine executable path (%s).\n", argv[0]);
+    return;
+  }
+#endif
+
+  CallModule("lib1");
+  CallModule("lib2");
+  return 0;
+}