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Whole program optimization is enabled by default in visual studio release builds, and this causes constructors (for e.g. resources) to be optimized away as they are not referenced from elsewhere. This works around this by some pragma magic. https://bugzilla.gnome.org/show_bug.cgi?id=752837
121 lines
4.1 KiB
C
121 lines
4.1 KiB
C
/*
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If G_HAS_CONSTRUCTORS is true then the compiler support *both* constructors and
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destructors, in a sane way, including e.g. on library unload. If not you're on
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your own.
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Some compilers need #pragma to handle this, which does not work with macros,
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so the way you need to use this is (for constructors):
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#ifdef G_DEFINE_CONSTRUCTOR_NEEDS_PRAGMA
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#pragma G_DEFINE_CONSTRUCTOR_PRAGMA_ARGS(my_constructor)
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#endif
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G_DEFINE_CONSTRUCTOR(my_constructor)
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static void my_constructor(void) {
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...
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}
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*/
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#ifndef __GTK_DOC_IGNORE__
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#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
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#define G_HAS_CONSTRUCTORS 1
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#define G_DEFINE_CONSTRUCTOR(_func) static void __attribute__((constructor)) _func (void);
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#define G_DEFINE_DESTRUCTOR(_func) static void __attribute__((destructor)) _func (void);
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#elif defined (_MSC_VER) && (_MSC_VER >= 1500)
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/* Visual studio 2008 and later has _Pragma */
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#define G_HAS_CONSTRUCTORS 1
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/* We do some weird things to avoid the constructors being optimized
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* away on VS2015 if WholeProgramOptimization is enabled. First we
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* make a reference to the array from the wrapper to make sure its
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* references. Then we use a pragma to make sure the wrapper function
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* symbol is always included at the link stage. Also, the symbols
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* need to be extern (but not dllexport), even though they are not
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* really used from another object file.
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*/
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/* We need to account for differences between the mangling of symbols
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* for Win32 (x86) and x64 programs, as symbols on Win32 are prefixed
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* with an underscore but symbols on x64 are not.
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*/
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#ifdef _WIN64
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#define G_MSVC_SYMBOL_PREFIX ""
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#else
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#define G_MSVC_SYMBOL_PREFIX "_"
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#endif
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#define G_DEFINE_CONSTRUCTOR(_func) G_MSVC_CTOR (_func, G_MSVC_SYMBOL_PREFIX)
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#define G_DEFINE_DESTRUCTOR(_func) G_MSVC_DTOR (_func, G_MSVC_SYMBOL_PREFIX)
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#define G_MSVC_CTOR(_func,_sym_prefix) \
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static void _func(void); \
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extern int (* _array ## _func)(void); \
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int _func ## _wrapper(void) { _func(); g_slist_find (NULL, _array ## _func); return 0; } \
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__pragma(comment(linker,"/include:" _sym_prefix # _func "_wrapper")) \
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__pragma(section(".CRT$XCU",read)) \
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__declspec(allocate(".CRT$XCU")) int (* _array ## _func)(void) = _func ## _wrapper;
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#define G_MSVC_DTOR(_func,_sym_prefix) \
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static void _func(void); \
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extern int (* _array ## _func)(void); \
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int _func ## _constructor(void) { atexit (_func); g_slist_find (NULL, _array ## _func); return 0; } \
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__pragma(comment(linker,"/include:" _sym_prefix # _func "_constructor")) \
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__pragma(section(".CRT$XCU",read)) \
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__declspec(allocate(".CRT$XCU")) int (* _array ## _func)(void) = _func ## _constructor;
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#elif defined (_MSC_VER)
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#define G_HAS_CONSTRUCTORS 1
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/* Pre Visual studio 2008 must use #pragma section */
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#define G_DEFINE_CONSTRUCTOR_NEEDS_PRAGMA 1
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#define G_DEFINE_DESTRUCTOR_NEEDS_PRAGMA 1
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#define G_DEFINE_CONSTRUCTOR_PRAGMA_ARGS(_func) \
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section(".CRT$XCU",read)
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#define G_DEFINE_CONSTRUCTOR(_func) \
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static void _func(void); \
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static int _func ## _wrapper(void) { _func(); return 0; } \
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__declspec(allocate(".CRT$XCU")) static int (*p)(void) = _func ## _wrapper;
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#define G_DEFINE_DESTRUCTOR_PRAGMA_ARGS(_func) \
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section(".CRT$XCU",read)
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#define G_DEFINE_DESTRUCTOR(_func) \
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static void _func(void); \
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static int _func ## _constructor(void) { atexit (_func); return 0; } \
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__declspec(allocate(".CRT$XCU")) static int (* _array ## _func)(void) = _func ## _constructor;
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#elif defined(__SUNPRO_C)
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/* This is not tested, but i believe it should work, based on:
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* http://opensource.apple.com/source/OpenSSL098/OpenSSL098-35/src/fips/fips_premain.c
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*/
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#define G_HAS_CONSTRUCTORS 1
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#define G_DEFINE_CONSTRUCTOR_NEEDS_PRAGMA 1
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#define G_DEFINE_DESTRUCTOR_NEEDS_PRAGMA 1
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#define G_DEFINE_CONSTRUCTOR_PRAGMA_ARGS(_func) \
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init(_func)
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#define G_DEFINE_CONSTRUCTOR(_func) \
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static void _func(void);
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#define G_DEFINE_DESTRUCTOR_PRAGMA_ARGS(_func) \
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fini(_func)
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#define G_DEFINE_DESTRUCTOR(_func) \
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static void _func(void);
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#else
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/* constructors not supported for this compiler */
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#endif
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#endif /* __GTK_DOC_IGNORE__ */
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