diff options
Diffstat (limited to 'misc/sys/cdefs.h')
| -rw-r--r-- | misc/sys/cdefs.h | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h index b3e7f3be96..cfd39d5302 100644 --- a/misc/sys/cdefs.h +++ b/misc/sys/cdefs.h @@ -463,17 +463,18 @@ # 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. +/* Generic selection (ISO C11) is a C-only feature, 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) +#if !defined __cplusplus \ + && (__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 |