From 62b7f85d47499c4f4428771454aab25eaba308a4 Mon Sep 17 00:00:00 2001 From: Ed Schouten Date: Wed, 3 Sep 2014 09:35:38 +0000 Subject: [PATCH] Leave the C11 keywords alone when we have a recent version of GCC. As GCC also gained support for the C11 keywords over time, we can patch up to not define these anymore. This has the advantage that error messages for static assertions are printed natively and that _Alignas() will work with even a type outside of C11 mode. All C11 keywords are supported with GCC 4.7 and higher, with the exception of _Thread_local and _Generic. These are only supported as of GCC 4.9. --- include/tgmath.h | 2 +- sys/sys/cdefs.h | 13 +++++++++---- 2 files changed, 10 insertions(+), 5 deletions(-) diff --git a/include/tgmath.h b/include/tgmath.h index 7f4de6f3fa6e..488575f0fbfa 100644 --- a/include/tgmath.h +++ b/include/tgmath.h @@ -61,7 +61,7 @@ */ #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \ - __has_extension(c_generic_selections) + __has_extension(c_generic_selections) || __GNUC_PREREQ__(4, 9) #define __tg_generic(x, cfnl, cfn, cfnf, fnl, fn, fnf) \ _Generic(x, \ long double _Complex: cfnl, \ diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h index 7af7e38f9f08..3d1aba46b037 100644 --- a/sys/sys/cdefs.h +++ b/sys/sys/cdefs.h @@ -254,7 +254,7 @@ #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L -#if !__has_extension(c_alignas) +#if !__has_extension(c_alignas) && !__GNUC_PREREQ__(4, 7) #if (defined(__cplusplus) && __cplusplus >= 201103L) || \ __has_extension(cxx_alignas) #define _Alignas(x) alignas(x) @@ -264,11 +264,13 @@ #endif #endif +#if !__GNUC_PREREQ__(4, 7) #if defined(__cplusplus) && __cplusplus >= 201103L #define _Alignof(x) alignof(x) #else #define _Alignof(x) __alignof(x) #endif +#endif #if !__has_extension(c_atomic) && !__has_extension(cxx_atomic) /* @@ -278,13 +280,15 @@ #define _Atomic(T) struct { T volatile __val; } #endif +#if !__GNUC_PREREQ__(4, 7) #if defined(__cplusplus) && __cplusplus >= 201103L #define _Noreturn [[noreturn]] #else #define _Noreturn __dead2 #endif +#endif -#if !__has_extension(c_static_assert) +#if !__has_extension(c_static_assert) && !__GNUC_PREREQ__(4, 7) #if (defined(__cplusplus) && __cplusplus >= 201103L) || \ __has_extension(cxx_static_assert) #define _Static_assert(x, y) static_assert(x, y) @@ -297,7 +301,7 @@ #endif #endif -#if !__has_extension(c_thread_local) +#if !__has_extension(c_thread_local) && !__GNUC_PREREQ__(4, 9) /* * XXX: Some compilers (Clang 3.3, GCC 4.7) falsely announce C++11 mode * without actually supporting the thread_local keyword. Don't check for @@ -322,7 +326,8 @@ * distinguish multiple cases. */ -#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L +#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \ + __has_extension(c_generic_selections) || __GNUC_PREREQ__(4, 9) #define __generic(expr, t, yes, no) \ _Generic(expr, t: yes, default: no) #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)