05bc2f4dc1
This is named gdkconstructor.h to avoid any possible conflicts. This fixes the current usages of G_HAS_CONSTRUCTORS, as that header is not installed by glib.
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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