diff options
Diffstat (limited to 'misc/sys/cdefs.h')
| -rw-r--r-- | misc/sys/cdefs.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h index 74f9a49b05..06523bfe9c 100644 --- a/misc/sys/cdefs.h +++ b/misc/sys/cdefs.h @@ -464,4 +464,20 @@ # define __glibc_macro_warning(msg) #endif +/* Support for generic selection (ISO C11) is available in GCC since + version 4.9. Previous versions do not provide generic selection, + even though they might set __STDC_VERSION__ to 201112L, when in + -std=c11 mode. Thus, we must check for !defined __GNUC__ when + testing __STDC_VERSION__ for generic selection support. + On the other hand, Clang also defines __GNUC__, so a clang-specific + check is required to enable the use of generic selection. */ +#if __GNUC_PREREQ (4, 9) \ + || __glibc_clang_has_extension (c_generic_selections) \ + || (!defined __GNUC__ && defined __STDC_VERSION__ \ + && __STDC_VERSION__ >= 201112L) +# define __HAVE_GENERIC_SELECTION 1 +#else +# define __HAVE_GENERIC_SELECTION 0 +#endif + #endif /* sys/cdefs.h */ |