Commit d7630af4363afdbda443c63400473dc135bc858f
2023-03-16T13:45:40
stddef: Define 'unreachable', for ISO C 23 compliance. * lib/verify.h (_GL_HAS_BUILTIN_UNREACHABLE): Don't define if already defined. * lib/stddef.in.h (_GL_HAS_BUILTIN_UNREACHABLE, unreachable): New macros. (abort): Declare if needed for unreachable. * m4/stddef_h.m4 (gl_STDDEF_H): Test for unreachable. * tests/test-stddef.c (test_unreachable_optimization, test_unreachable_noreturn): New functions, based on tests/test-verify.c. * doc/posix-headers/stddef.texi: Mention unreachable.