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authorZack Weinberg <zackw@panix.com>2016-04-28 11:07:58 -0400
committerZack Weinberg <zackw@panix.com>2016-08-03 14:03:46 -0400
commitcab4d74b01320670f57dcf356ff89256f4d2fc12 (patch)
tree2a043314a5c820767e04a810eff4ecbad70a5a49 /sysdeps/unix/sysv
parentbf91be88ea90c1ea888d5646270d66363389ce96 (diff)
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Add utility macros for clang detection, and deprecation with messages.
There are three new macros added to features.h and sys/cdefs.h: * __glibc_clang_prereq: just like __GNUC_PREREQ, but for clang. * __glibc_clang_has_extension: wraps clang's intrinsic __has_extension. Writing "#if defined __clang__ && __has_extension (...)" doesn't work, because compilers other than clang will object to the unknown macro __has_extension even though they don't need to evaluate it. Instead, write "#if __glibc_clang_has_extension (...)". * __attribute_deprecated_msg__(msg): like __attribute_deprecated__, but if possible, prints a message. The first two are used to define the third. The third will be used in subsequent patches. * include/features.h (__glibc_clang_prereq): New macro. * misc/sys/cdefs.h (__glibc_clang_has_extension) (__attribute_deprecated_msg__): New macros.
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