39 lines
1,001 B
C
39 lines
1,001 B
C
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/*
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* Define a macro for compiler attributes. Use either gcc
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* syntax if __GNUC__ is defined, or try to look for the
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* modern standard [[x]] attributes.
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*
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* Unfortunately [[x]] doesn't always work when it comes to
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* GNUC-specific attributes, and some compilers support GCC
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* syntax without __attribute__ just to be confusing.
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* Therefore, this also needs an autoconf module to test
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* the validity.
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*
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* Use #ifdef and not defined() here; some compilers do the wrong
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* thing in the latter case.
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*/
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#ifndef ATTRIBUTE
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# define MODERN_ATTRIBUTE(x) [[x]]
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# ifndef __GNUC__
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# ifdef __cplusplus
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# ifdef __has_cpp_attribute
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# define ATTRIBUTE(x) MODERN_ATTRIBUTE(x)
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# endif
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# endif
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# ifndef ATTRIBUTE
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# ifdef __has_c_attribute
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# define ATTRIBUTE(x) MODERN_ATTRIBUTE(x)
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# endif
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# endif
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# ifndef ATTRIBUTE
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# ifdef __has_attribute
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# define ATTRIBUTE(x) MODERN_ATTRIBUTE(x)
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# endif
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# endif
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# endif
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# ifndef ATTRIBUTE
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# define ATTRIBUTE(x) __attribute__((x))
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# endif
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#endif
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