From be3bba2a1cf9551778683e25f61bffc7c187f93c Mon Sep 17 00:00:00 2001
From: Simon Howard
Date: Mon, 7 Sep 2009 19:43:04 +0000
Subject: Fix compilation under MacOS X.

Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 1659
---
 acinclude.m4 | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 acinclude.m4

(limited to 'acinclude.m4')

diff --git a/acinclude.m4 b/acinclude.m4
new file mode 100644
index 00000000..ac54f4b9
--- /dev/null
+++ b/acinclude.m4
@@ -0,0 +1,31 @@
+
+dnl Macro to check if autoconf's compile tests have been broken by
+dnl SDL.  Tries to build the simplest possible program, and if it
+dnl fails, calls the given block.
+
+AC_DEFUN([AC_CHECK_SDL_BREAKAGE], [
+    AC_LINK_IFELSE(AC_LANG_PROGRAM([], []), [], [
+        $1
+    ])
+])
+
+dnl Macro to work around SDL redefining main.  The provided block
+dnl is run with main #defined to SDL_main via a compiler switch
+dnl if autoconf tests are found to be broken.
+
+AC_DEFUN([AC_SDL_MAIN_WORKAROUND], [
+    sdl_workaround_saved_CFLAGS="$CFLAGS"
+
+    AC_CHECK_SDL_BREAKAGE([
+        CFLAGS="$CFLAGS -Dmain=SDL_main"
+    ])
+
+    AC_CHECK_SDL_BREAKAGE([
+        AC_MSG_ERROR([Autoconf checks broken by SDL, and can't figure out how to fix them.])
+    ])
+
+    $1
+
+    CFLAGS="$sdl_workaround_saved_CFLAGS"
+])
+
-- 
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