mgba patch to build on Leopard with gcc 4.2

gistfile1.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 04a4f1c..3a49def 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 2.6)
 project(mGBA C)
 set(BINARY_NAME mgba CACHE INTERNAL "Name of output binaries")
 if(NOT MSVC)
-       set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wno-missing-field-initializers -std=c99")
+       set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wno-missing-field-initializers -std=gnu99")
 else()
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_CRT_SECURE_NO_WARNINGS /wd4003 /wd4244 /wd4146")
 endif()
@@ -223,8 +223,8 @@ endif()
 list(APPEND OS_LIB ${M_LIBRARY})
 
 if(APPLE OR CMAKE_C_COMPILER_ID STREQUAL "GNU" AND BUILD_LTO)
-       set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -flto")
-       set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -flto")
+       set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")
+       set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
 endif()
 
 if(BUILD_BBB OR BUILD_RASPI OR BUILD_PANDORA)
diff --git a/include/mgba-util/common.h b/include/mgba-util/common.h
index 63e3dd3..cf66e94 100644
--- a/include/mgba-util/common.h
+++ b/include/mgba-util/common.h
@@ -61,6 +61,10 @@ typedef intptr_t ssize_t;
 #include <sys/syslimits.h>
 #endif
 
+#ifdef __APPLE__
+#include <libkern/OSByteOrder.h>
+#endif
+
 #ifndef SSIZE_MAX
 #define SSIZE_MAX ((ssize_t) (SIZE_MAX >> 1))
 #endif
@@ -73,7 +77,7 @@ typedef intptr_t ssize_t;
 #define M_PI 3.141592654f
 #endif
 
-#ifndef _MSC_VER
+#if 0
 #define ATOMIC_STORE(DST, SRC) __atomic_store_n(&DST, SRC, __ATOMIC_RELEASE)
 #define ATOMIC_LOAD(DST, SRC) DST = __atomic_load_n(&SRC, __ATOMIC_ACQUIRE)
 #define ATOMIC_ADD(DST, OP) __atomic_add_fetch(&DST, OP, __ATOMIC_RELEASE)
@@ -126,8 +130,13 @@ typedef intptr_t ssize_t;
        __asm__("sthbrx %0, %1, %2" : : "r"(SRC), "b"(_ptr), "r"(_addr)); \
 }
 
+#if defined(__APPLE__)
+#define LOAD_64LE(DEST, ADDR, ARR) DEST = OSSwapInt64(((uint64_t*) ARR)[(ADDR) >> 3])
+#define STORE_64LE(SRC, ADDR, ARR) ((uint64_t*) ARR)[(ADDR) >> 3] = OSSwapInt64(SRC)
+#else
 #define LOAD_64LE(DEST, ADDR, ARR) DEST = __builtin_bswap64(((uint64_t*) ARR)[(ADDR) >> 3])
 #define STORE_64LE(SRC, ADDR, ARR) ((uint64_t*) ARR)[(ADDR) >> 3] = __builtin_bswap64(SRC)
+#endif
 #elif defined __BIG_ENDIAN__
 #if defined(__llvm__) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
 #define LOAD_64LE(DEST, ADDR, ARR) DEST = __builtin_bswap64(((uint64_t*) ARR)[(ADDR) >> 3])
diff --git a/include/mgba-util/platform/posix/threading.h b/include/mgba-util/platform/posix/threading.h
index b880c54..577df37 100644
--- a/include/mgba-util/platform/posix/threading.h
+++ b/include/mgba-util/platform/posix/threading.h
@@ -84,7 +84,9 @@ static inline int ThreadJoin(Thread thread) {
 
 static inline int ThreadSetName(const char* name) {
 #ifdef __APPLE__
-       return pthread_setname_np(name);
+       //return pthread_setname_np(name);
+       UNUSED(name);
+       return 0;
 #elif defined(__FreeBSD__) || defined(__OpenBSD__)
        pthread_set_name_np(pthread_self(), name);
        return 0;
diff --git a/src/platform/sdl/CMakeLists.txt b/src/platform/sdl/CMakeLists.txt
index 9a653fc..b606848 100644
--- a/src/platform/sdl/CMakeLists.txt
+++ b/src/platform/sdl/CMakeLists.txt
@@ -86,6 +86,10 @@ else()
        endif()
 endif()
 
+if(APPLE)
+       list(APPEND PLATFORM_SRC ${CMAKE_SOURCE_DIR}/src/platform/sdl/SDLMain.m)
+endif()
+
 add_executable(${BINARY_NAME}-sdl WIN32 ${PLATFORM_SRC} ${MAIN_SRC})
 set_target_properties(${BINARY_NAME}-sdl PROPERTIES COMPILE_DEFINITIONS "${FEATURE_DEFINES};${FUNCTION_DEFINES}")
 target_link_libraries(${BINARY_NAME}-sdl ${BINARY_NAME} ${PLATFORM_LIBRARY} ${OPENGL_LIBRARY} ${OPENGLES2_LIBRARY})

If you want to file a PR, I can try to do a proper review. That said, here are some preliminary things:

• OSWriteLittleInt64 is probably a better approach than OSSwapInt64
• Detecting the compiler version for swapping between gnu99/c99 and -flto is probably a good approach
• Using check_function_exists for pthread_set_name_np/pthread_setname_np/just dummying out the function is a good idea.