Changeset 2273Tweet

Timestamp:

Jan 25, 2013, 12:38:58 PM (10 years ago)

Author:

sam

Message:

build: use our own main() wrapper in addition to SDL's, and only
in that case. Currently only works with GCC.

Location:

trunk

Files:

• configure.ac (modified) (1 diff)
• src/core.h (modified) (1 diff)
• src/platform/sdl/sdlapp.cpp (modified) (2 diffs)
• test/math/Makefile.am (modified) (1 diff)

trunk/configure.ac

@@ -198 +198 @@
  [AC_MSG_RESULT(yes)
   CXXFLAGS="${CXXFLAGS} -mwindows -mwin32"
-  LOL_LIBS="${LOL_LIBS} -uWinMain -u_WinMain@16"],
+  dnl  If we come across these symbols, try to link them
+  LOL_LIBS="${LOL_LIBS} -uWinMain -u_WinMain@16 -u_SDL_main"],
  [AC_MSG_RESULT(no)])
 LIBS="$LIBS_save"

trunk/src/core.h

@@ -69 +69 @@
 #endif
 
-/* If using SDL on Windows or OS X, let it override main() */
-#if defined USE_SDL && (defined _WIN32 || defined __APPLE__)
+/* If using SDL, let it override main() but immediately replace
+ * the override with ours. */
+#if defined USE_SDL
 #   include <SDL_main.h>
+#   if defined main && !LOL_DONT_DIVERT_MAIN
+#       undef main
+#       define main lol_sdl_main
+#   endif
 #endif
 

trunk/src/platform/sdl/sdlapp.cpp

@@ -12 +12 @@
 #   include "config.h"
 #endif
+
+/* This instructs our headers to let SDL override the "main"
+ * symbol using its macros. */
+#define LOL_DONT_DIVERT_MAIN 1
 
 #if defined USE_SDL
@@ -36 +40 @@
 HWND g_hwnd = NULL;
 extern IDirect3DDevice9 *g_d3ddevice;
+#endif
+
+#if defined main
+#   if defined _MSC_VER
+#       pragma comment(linker, "/alternatename:_lol_sdl_main=_lol_sdl_main_msvc")
+#       define WRAPPER lol_sdl_main_msvc
+#   else
+int lol_sdl_main() __attribute__((weak));
+int lol_sdl_main(int argc, char **argv) __attribute__((weak));
+int lol_sdl_main(int argc, char **argv, char **envp) __attribute__((weak));
+#       define WRAPPER lol_sdl_main
+#   endif
+
+/* One of these wrappers will be overridden by the user's version */
+int WRAPPER() { return 0; }
+int WRAPPER(int argc, char **argv) { return 0; }
+int WRAPPER(int argc, char **argv, char **envp) { return 0; }
+
+int main(int argc, char *argv[])
+{
+printf("LOL OK\n");
+    int ret = 0;
+    ret += lol_sdl_main();
+    ret += lol_sdl_main(argc, argv);
+    ret += lol_sdl_main(argc, argv, NULL);
+    return ret;
+}
 #endif
 

trunk/test/math/Makefile.am

@@ -10 +10 @@
 pi_SOURCES = pi.cpp
 pi_CPPFLAGS = @LOL_CFLAGS@
-pi_LDFLAGS = $(top_builddir)/src/liblol.a @LOL_LIBS@
+pi_LDFLAGS = -u_SDL_main -uSDL_main $(top_builddir)/src/liblol.a @LOL_LIBS@
 pi_DEPENDENCIES = $(top_builddir)/src/liblol.a