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gmacros.h: use g_macro__has_attribute() where possible
Fall back to compiler version checks only when `__has_attribute()` is not available. clang-cl doesn't define `__GNU__`, but still accepts attributes. This change gets rid of a lot of warnings when building GLib with clang-cl. For GCC and non-cl Clang nothing should change.
This commit is contained in:
Aleksandr Mezin
parent
a78b7ebb20
commit
2b9bf7b162
@ -754,6 +754,21 @@ g_macro__has_attribute
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g_macro__has_builtin
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g_macro__has_feature
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g_macro__has_extension
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g_macro__has_attribute___alloc_size__
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g_macro__has_attribute___const__
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g_macro__has_attribute___deprecated__
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g_macro__has_attribute___format__
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g_macro__has_attribute___format_arg__
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g_macro__has_attribute___malloc__
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g_macro__has_attribute___no_instrument_function__
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g_macro__has_attribute___noreturn__
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g_macro__has_attribute___pure__
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g_macro__has_attribute___sentinel__
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g_macro__has_attribute___unused__
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g_macro__has_attribute_fallthrough
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g_macro__has_attribute_may_alias
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g_macro__has_attribute_noinline
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g_macro__has_attribute_warn_unused_result
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</SECTION>
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<SECTION>
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127
glib/gmacros.h
127
glib/gmacros.h
@ -37,6 +37,12 @@
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*/
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#include <stddef.h>
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/*
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* Note: Clang (but not clang-cl) defines __GNUC__ and __GNUC_MINOR__.
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* Both Clang 11.1 on current Arch Linux and Apple's Clang 12.0 define
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* __GNUC__ = 4 and __GNUC_MINOR__ = 2. So G_GNUC_CHECK_VERSION(4, 2) on
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* current Clang will be 1.
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*/
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#ifdef __GNUC__
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#define G_GNUC_CHECK_VERSION(major, minor) \
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((__GNUC__ > (major)) || \
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@ -106,6 +112,39 @@
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# define G_INLINE_FUNC static inline GLIB_DEPRECATED_MACRO_IN_2_48_FOR(static inline)
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#endif /* G_IMPLEMENT_INLINES */
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/*
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* Attribute support detection. Works on clang and GCC >= 5
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* https://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
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* https://gcc.gnu.org/onlinedocs/cpp/_005f_005fhas_005fattribute.html
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*/
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#ifdef __has_attribute
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#define g_macro__has_attribute __has_attribute
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#else
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/*
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* Fallback for GCC < 5 and other compilers not supporting __has_attribute.
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*/
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#define g_macro__has_attribute(x) g_macro__has_attribute_##x
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#define g_macro__has_attribute___pure__ G_GNUC_CHECK_VERSION (2, 96)
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#define g_macro__has_attribute___malloc__ G_GNUC_CHECK_VERSION (2, 96)
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#define g_macro__has_attribute_noinline G_GNUC_CHECK_VERSION (2, 96)
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#define g_macro__has_attribute___sentinel__ G_GNUC_CHECK_VERSION (4, 0)
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#define g_macro__has_attribute___alloc_size__ G_GNUC_CHECK_VERSION (4, 3)
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#define g_macro__has_attribute___format__ G_GNUC_CHECK_VERSION (2, 4)
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#define g_macro__has_attribute___format_arg__ G_GNUC_CHECK_VERSION (2, 4)
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#define g_macro__has_attribute___noreturn__ G_GNUC_CHECK_VERSION (2, 4)
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#define g_macro__has_attribute___const__ G_GNUC_CHECK_VERSION (2, 4)
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#define g_macro__has_attribute___unused__ G_GNUC_CHECK_VERSION (2, 4)
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#define g_macro__has_attribute___no_instrument_function__ G_GNUC_CHECK_VERSION (2, 4)
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#define g_macro__has_attribute_fallthrough G_GNUC_CHECK_VERSION (6, 0)
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#define g_macro__has_attribute___deprecated__ G_GNUC_CHECK_VERSION (3, 1)
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#define g_macro__has_attribute_may_alias G_GNUC_CHECK_VERSION (3, 3)
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#define g_macro__has_attribute_warn_unused_result G_GNUC_CHECK_VERSION (3, 4)
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#endif
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/* Provide macros to feature the GCC function attribute.
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*/
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@ -194,13 +233,21 @@
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* code which includes glib.h, even if the third party code doesn’t use the new
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* macro itself. */
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#if G_GNUC_CHECK_VERSION(2, 96)
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#if g_macro__has_attribute(__pure__)
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#define G_GNUC_PURE __attribute__((__pure__))
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#define G_GNUC_MALLOC __attribute__((__malloc__))
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#define G_GNUC_NO_INLINE __attribute__((noinline))
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#else
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#define G_GNUC_PURE
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#endif
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#if g_macro__has_attribute(__malloc__)
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#define G_GNUC_MALLOC __attribute__ ((__malloc__))
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#else
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#define G_GNUC_MALLOC
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#endif
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#if g_macro__has_attribute(noinline)
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#define G_GNUC_NO_INLINE __attribute__ ((noinline))
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#else
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#define G_GNUC_NO_INLINE
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#endif
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@ -223,7 +270,7 @@
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*
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* Since: 2.8
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*/
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#if G_GNUC_CHECK_VERSION(4, 0)
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#if g_macro__has_attribute(__sentinel__)
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#define G_GNUC_NULL_TERMINATED __attribute__((__sentinel__))
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#else
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#define G_GNUC_NULL_TERMINATED
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@ -261,12 +308,6 @@
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* So we define it to 0 to satisfy the pre-processor.
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*/
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#ifdef __has_attribute
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#define g_macro__has_attribute __has_attribute
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#else
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#define g_macro__has_attribute(x) 0
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#endif
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#ifdef __has_feature
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#define g_macro__has_feature __has_feature
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#else
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@ -328,8 +369,7 @@
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*
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* Since: 2.18
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*/
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#if (!defined(__clang__) && G_GNUC_CHECK_VERSION(4, 3)) || \
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(defined(__clang__) && g_macro__has_attribute(__alloc_size__))
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#if g_macro__has_attribute(__alloc_size__)
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#define G_GNUC_ALLOC_SIZE(x) __attribute__((__alloc_size__(x)))
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#define G_GNUC_ALLOC_SIZE2(x,y) __attribute__((__alloc_size__(x,y)))
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#else
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@ -515,7 +555,8 @@
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* See the [GNU C documentation](https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-no_005finstrument_005ffunction-function-attribute) for more details.
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*/
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#if G_GNUC_CHECK_VERSION(2, 4)
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#if g_macro__has_attribute(__format__)
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#if !defined (__clang__) && G_GNUC_CHECK_VERSION (4, 4)
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#define G_GNUC_PRINTF( format_idx, arg_idx ) \
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__attribute__((__format__ (gnu_printf, format_idx, arg_idx)))
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@ -533,31 +574,54 @@
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__attribute__((__format__ (__strftime__, format_idx, 0))) \
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GLIB_AVAILABLE_MACRO_IN_2_60
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#endif
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#define G_GNUC_FORMAT( arg_idx ) \
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__attribute__((__format_arg__ (arg_idx)))
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#define G_GNUC_NORETURN \
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__attribute__((__noreturn__))
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#define G_GNUC_CONST \
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__attribute__((__const__))
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#define G_GNUC_UNUSED \
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__attribute__((__unused__))
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#define G_GNUC_NO_INSTRUMENT \
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__attribute__((__no_instrument_function__))
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#else /* !__GNUC__ */
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#else
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#define G_GNUC_PRINTF( format_idx, arg_idx )
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#define G_GNUC_SCANF( format_idx, arg_idx )
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#define G_GNUC_STRFTIME( format_idx ) \
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GLIB_AVAILABLE_MACRO_IN_2_60
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#endif
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#if g_macro__has_attribute(__format_arg__)
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#define G_GNUC_FORMAT(arg_idx) \
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__attribute__ ((__format_arg__ (arg_idx)))
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#else
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#define G_GNUC_FORMAT( arg_idx )
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#endif
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#if g_macro__has_attribute(__noreturn__)
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#define G_GNUC_NORETURN \
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__attribute__ ((__noreturn__))
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#else
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/* NOTE: MSVC has __declspec(noreturn) but unlike GCC __attribute__,
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* __declspec can only be placed at the start of the function prototype
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* and not at the end, so we can't use it without breaking API.
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*/
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#define G_GNUC_NORETURN
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#endif
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#if g_macro__has_attribute(__const__)
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#define G_GNUC_CONST \
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__attribute__ ((__const__))
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#else
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#define G_GNUC_CONST
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#endif
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#if g_macro__has_attribute(__unused__)
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#define G_GNUC_UNUSED \
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__attribute__ ((__unused__))
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#else
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#define G_GNUC_UNUSED
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#endif
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#if g_macro__has_attribute(__no_instrument_function__)
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#define G_GNUC_NO_INSTRUMENT \
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__attribute__ ((__no_instrument_function__))
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#else
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#define G_GNUC_NO_INSTRUMENT
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#endif /* !__GNUC__ */
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#endif
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/**
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* G_GNUC_FALLTHROUGH:
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@ -587,16 +651,13 @@
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*
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* Since: 2.60
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*/
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#if G_GNUC_CHECK_VERSION(6, 0)
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#define G_GNUC_FALLTHROUGH __attribute__((fallthrough)) \
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GLIB_AVAILABLE_MACRO_IN_2_60
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#elif g_macro__has_attribute (fallthrough)
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#if g_macro__has_attribute(fallthrough)
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#define G_GNUC_FALLTHROUGH __attribute__((fallthrough)) \
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GLIB_AVAILABLE_MACRO_IN_2_60
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#else
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#define G_GNUC_FALLTHROUGH \
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GLIB_AVAILABLE_MACRO_IN_2_60
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#endif /* __GNUC__ */
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#endif
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/**
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* G_GNUC_DEPRECATED:
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@ -616,7 +677,7 @@
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*
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* Since: 2.2
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*/
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#if G_GNUC_CHECK_VERSION(3, 1) || defined(__clang__)
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#if g_macro__has_attribute(__deprecated__)
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#define G_GNUC_DEPRECATED __attribute__((__deprecated__))
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#else
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#define G_GNUC_DEPRECATED
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@ -694,7 +755,7 @@
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*
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* Since: 2.14
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*/
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#if G_GNUC_CHECK_VERSION(3, 3)
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#if g_macro__has_attribute(may_alias)
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#define G_GNUC_MAY_ALIAS __attribute__((may_alias))
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#else
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#define G_GNUC_MAY_ALIAS
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@ -718,7 +779,7 @@
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*
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* Since: 2.10
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*/
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#if G_GNUC_CHECK_VERSION(3, 4)
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#if g_macro__has_attribute(warn_unused_result)
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#define G_GNUC_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
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#else
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#define G_GNUC_WARN_UNUSED_RESULT
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