diff options
Diffstat (limited to 'misc/sys/cdefs.h')
| -rw-r--r-- | misc/sys/cdefs.h | 142 |
1 files changed, 85 insertions, 57 deletions
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h index 57ca262bdf..8e244a77cf 100644 --- a/misc/sys/cdefs.h +++ b/misc/sys/cdefs.h @@ -34,7 +34,29 @@ #undef __P #undef __PMT -#ifdef __GNUC__ +/* Compilers that lack __has_attribute may object to + #if defined __has_attribute && __has_attribute (...) + even though they do not need to evaluate the right-hand side of the &&. + Similarly for __has_builtin, etc. */ +#if (defined __has_attribute \ + && (!defined __clang_minor__ \ + || 3 < __clang_major__ + (5 <= __clang_minor__))) +# define __glibc_has_attribute(attr) __has_attribute (attr) +#else +# define __glibc_has_attribute(attr) 0 +#endif +#ifdef __has_builtin +# define __glibc_has_builtin(name) __has_builtin (name) +#else +# define __glibc_has_builtin(name) 0 +#endif +#ifdef __has_extension +# define __glibc_has_extension(ext) __has_extension (ext) +#else +# define __glibc_has_extension(ext) 0 +#endif + +#if defined __GNUC__ || defined __clang__ /* All functions, except those with callbacks or those that synchronize memory, are leaf functions. */ @@ -48,16 +70,17 @@ /* GCC can always grok prototypes. For C++ programs we add throw() to help it optimize the function calls. But this only works with - gcc 2.8.x and egcs. For gcc 3.2 and up we even mark C functions + gcc 2.8.x and egcs. For gcc 3.4 and up we even mark C functions as non-throwing using a function attribute since programs can use the -fexceptions options for C code as well. */ -# if !defined __cplusplus && __GNUC_PREREQ (3, 3) +# if !defined __cplusplus \ + && (__GNUC_PREREQ (3, 4) || __glibc_has_attribute (__nothrow__)) # define __THROW __attribute__ ((__nothrow__ __LEAF)) # define __THROWNL __attribute__ ((__nothrow__)) # define __NTH(fct) __attribute__ ((__nothrow__ __LEAF)) fct # define __NTHNL(fct) __attribute__ ((__nothrow__)) fct # else -# if defined __cplusplus && __GNUC_PREREQ (2,8) +# if defined __cplusplus && (__GNUC_PREREQ (2,8) || __clang_major >= 4) # if __cplusplus >= 201103L # define __THROW noexcept (true) # else @@ -74,7 +97,7 @@ # endif # endif -#else /* Not GCC. */ +#else /* Not GCC or clang. */ # if (defined __cplusplus \ || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) @@ -87,16 +110,7 @@ # define __THROWNL # define __NTH(fct) fct -#endif /* GCC. */ - -/* Compilers that are not clang may object to - #if defined __clang__ && __has_extension(...) - even though they do not need to evaluate the right-hand side of the &&. */ -#if defined __clang__ && defined __has_extension -# define __glibc_clang_has_extension(ext) __has_extension (ext) -#else -# define __glibc_clang_has_extension(ext) 0 -#endif +#endif /* GCC || clang. */ /* These two macros are not used in glibc anymore. They are kept here only because some other projects expect the macros to be defined. */ @@ -149,11 +163,11 @@ Headers that should use flexible arrays only if they're "real" (e.g. only if they won't affect sizeof()) should test #if __glibc_c99_flexarr_available. */ -#if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L +#if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L && !defined __HP_cc # define __flexarr [] # define __glibc_c99_flexarr_available 1 -#elif __GNUC_PREREQ (2,97) -/* GCC 2.97 supports C99 flexible array members as an extension, +#elif __GNUC_PREREQ (2,97) || defined __clang__ +/* GCC 2.97 and clang support C99 flexible array members as an extension, even when in C89 mode or compiling C++ (any version). */ # define __flexarr [] # define __glibc_c99_flexarr_available 1 @@ -179,7 +193,7 @@ Example: int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */ -#if defined __GNUC__ && __GNUC__ >= 2 +#if (defined __GNUC__ && __GNUC__ >= 2) || (__clang_major__ >= 4) # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias)) # ifdef __cplusplus @@ -204,17 +218,17 @@ */ #endif -/* GCC has various useful declarations that can be made with the - `__attribute__' syntax. All of the ways we use this do fine if - they are omitted for compilers that don't understand it. */ -#if !defined __GNUC__ || __GNUC__ < 2 +/* GCC and clang have various useful declarations that can be made with + the '__attribute__' syntax. All of the ways we use this do fine if + they are omitted for compilers that don't understand it. */ +#if !(defined __GNUC__ || defined __clang__) # define __attribute__(xyz) /* Ignore */ #endif /* At some point during the gcc 2.96 development the `malloc' attribute for functions was introduced. We don't want to use it unconditionally (although this would be possible) since it generates warnings. */ -#if __GNUC_PREREQ (2,96) +#if __GNUC_PREREQ (2,96) || __glibc_has_attribute (__malloc__) # define __attribute_malloc__ __attribute__ ((__malloc__)) #else # define __attribute_malloc__ /* Ignore */ @@ -232,23 +246,29 @@ /* At some point during the gcc 2.96 development the `pure' attribute for functions was introduced. We don't want to use it unconditionally (although this would be possible) since it generates warnings. */ -#if __GNUC_PREREQ (2,96) +#if __GNUC_PREREQ (2,96) || __glibc_has_attribute (__pure__) # define __attribute_pure__ __attribute__ ((__pure__)) #else # define __attribute_pure__ /* Ignore */ #endif /* This declaration tells the compiler that the value is constant. */ -#if __GNUC_PREREQ (2,5) +#if __GNUC_PREREQ (2,5) || __glibc_has_attribute (__const__) # define __attribute_const__ __attribute__ ((__const__)) #else # define __attribute_const__ /* Ignore */ #endif +#if __GNUC_PREREQ (2,7) || __glibc_has_attribute (__unused__) +# define __attribute_maybe_unused__ __attribute__ ((__unused__)) +#else +# define __attribute_maybe_unused__ /* Ignore */ +#endif + /* At some point during the gcc 3.1 development the `used' attribute for functions was introduced. We don't want to use it unconditionally (although this would be possible) since it generates warnings. */ -#if __GNUC_PREREQ (3,1) +#if __GNUC_PREREQ (3,1) || __glibc_has_attribute (__used__) # define __attribute_used__ __attribute__ ((__used__)) # define __attribute_noinline__ __attribute__ ((__noinline__)) #else @@ -257,7 +277,7 @@ #endif /* Since version 3.2, gcc allows marking deprecated functions. */ -#if __GNUC_PREREQ (3,2) +#if __GNUC_PREREQ (3,2) || __glibc_has_attribute (__deprecated__) # define __attribute_deprecated__ __attribute__ ((__deprecated__)) #else # define __attribute_deprecated__ /* Ignore */ @@ -267,7 +287,7 @@ when a deprecated function is used. clang claims to be gcc 4.2, but may also support this feature. */ #if __GNUC_PREREQ (4,5) \ - || __glibc_clang_has_extension (__attribute_deprecated_with_message__) + || __glibc_has_extension (__attribute_deprecated_with_message__) # define __attribute_deprecated_msg__(msg) \ __attribute__ ((__deprecated__ (msg))) #else @@ -280,7 +300,7 @@ If several `format_arg' attributes are given for the same function, in gcc-3.0 and older, all but the last one are ignored. In newer gccs, all designated arguments are considered. */ -#if __GNUC_PREREQ (2,8) +#if __GNUC_PREREQ (2,8) || __glibc_has_attribute (__format_arg__) # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x))) #else # define __attribute_format_arg__(x) /* Ignore */ @@ -290,27 +310,32 @@ attribute for functions was introduced. We don't want to use it unconditionally (although this would be possible) since it generates warnings. */ -#if __GNUC_PREREQ (2,97) +#if __GNUC_PREREQ (2,97) || __glibc_has_attribute (__format__) # define __attribute_format_strfmon__(a,b) \ __attribute__ ((__format__ (__strfmon__, a, b))) #else # define __attribute_format_strfmon__(a,b) /* Ignore */ #endif -/* The nonull function attribute allows to mark pointer parameters which +/* The nonnull function attribute marks pointer parameters that must not be NULL. */ -#if __GNUC_PREREQ (3,3) -# define __nonnull(params) __attribute__ ((__nonnull__ params)) -#else -# define __nonnull(params) +#ifndef __nonnull +# if __GNUC_PREREQ (3,3) || __glibc_has_attribute (__nonnull__) +# define __nonnull(params) __attribute__ ((__nonnull__ params)) +# else +# define __nonnull(params) +# endif +#elif !defined __GLIBC__ +# undef __nonnull +# define __nonnull(params) _GL_ATTRIBUTE_NONNULL (params) #endif /* If fortification mode, we warn about unused results of certain function calls which can lead to problems. */ -#if __GNUC_PREREQ (3,4) +#if __GNUC_PREREQ (3,4) || __glibc_has_attribute (__warn_unused_result__) # define __attribute_warn_unused_result__ \ __attribute__ ((__warn_unused_result__)) -# if __USE_FORTIFY_LEVEL > 0 +# if defined __USE_FORTIFY_LEVEL && __USE_FORTIFY_LEVEL > 0 # define __wur __attribute_warn_unused_result__ # endif #else @@ -321,7 +346,7 @@ #endif /* Forces a function to be always inlined. */ -#if __GNUC_PREREQ (3,2) +#if __GNUC_PREREQ (3,2) || __glibc_has_attribute (__always_inline__) /* The Linux kernel defines __always_inline in stddef.h (283d7573), and it conflicts with this definition. Therefore undefine it first to allow either header to be included first. */ @@ -334,7 +359,7 @@ /* Associate error messages with the source location of the call site rather than with the source location inside the function. */ -#if __GNUC_PREREQ (4,3) +#if __GNUC_PREREQ (4,3) || __glibc_has_attribute (__artificial__) # define __attribute_artificial__ __attribute__ ((__artificial__)) #else # define __attribute_artificial__ /* Ignore */ @@ -377,12 +402,14 @@ run in pedantic mode if the uses are carefully marked using the `__extension__' keyword. But this is not generally available before version 2.8. */ -#if !__GNUC_PREREQ (2,8) +#if !(__GNUC_PREREQ (2,8) || defined __clang__) # define __extension__ /* Ignore */ #endif -/* __restrict is known in EGCS 1.2 and above. */ -#if !__GNUC_PREREQ (2,92) +/* __restrict is known in EGCS 1.2 and above, and in clang. + It works also in C++ mode (outside of arrays), but only when spelled + as '__restrict', not 'restrict'. */ +#if !(__GNUC_PREREQ (2,92) || __clang_major__ >= 3) # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L # define __restrict restrict # else @@ -392,8 +419,9 @@ /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is array_name[restrict] - GCC 3.1 supports this. */ -#if __GNUC_PREREQ (3,1) && !defined __GNUG__ + GCC 3.1 and clang support this. + This syntax is not usable in C++ mode. */ +#if (__GNUC_PREREQ (3,1) || __clang_major__ >= 3) && !defined __cplusplus # define __restrict_arr __restrict #else # ifdef __GNUC__ @@ -408,7 +436,7 @@ # endif #endif -#if __GNUC__ >= 3 +#if (__GNUC__ >= 3) || __glibc_has_builtin (__builtin_expect) # define __glibc_unlikely(cond) __builtin_expect ((cond), 0) # define __glibc_likely(cond) __builtin_expect ((cond), 1) #else @@ -416,15 +444,10 @@ # define __glibc_likely(cond) (cond) #endif -#ifdef __has_attribute -# define __glibc_has_attribute(attr) __has_attribute (attr) -#else -# define __glibc_has_attribute(attr) 0 -#endif - #if (!defined _Noreturn \ && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \ - && !__GNUC_PREREQ (4,7)) + && !(__GNUC_PREREQ (4,7) \ + || (3 < __clang_major__ + (5 <= __clang_minor__)))) # if __GNUC_PREREQ (2,8) # define _Noreturn __attribute__ ((__noreturn__)) # else @@ -453,14 +476,19 @@ #if (!defined _Static_assert && !defined __cplusplus \ && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \ - && (!__GNUC_PREREQ (4, 6) || defined __STRICT_ANSI__)) + && (!(__GNUC_PREREQ (4, 6) || __clang_major__ >= 4) \ + || defined __STRICT_ANSI__)) # define _Static_assert(expr, diagnostic) \ extern int (*__Static_assert_function (void)) \ [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })] #endif -#include <bits/wordsize.h> -#include <bits/long-double.h> +/* The #ifndef lets Gnulib avoid including these on non-glibc + platforms, where the includes typically do not exist. */ +#ifdef __GLIBC__ +# include <bits/wordsize.h> +# include <bits/long-double.h> +#endif #if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1 # ifdef __REDIRECT @@ -550,7 +578,7 @@ _Static_assert (0, "IEEE 128-bits long double requires redirection on this platf check is required to enable the use of generic selection. */ #if !defined __cplusplus \ && (__GNUC_PREREQ (4, 9) \ - || __glibc_clang_has_extension (c_generic_selections) \ + || __glibc_has_extension (c_generic_selections) \ || (!defined __GNUC__ && defined __STDC_VERSION__ \ && __STDC_VERSION__ >= 201112L)) # define __HAVE_GENERIC_SELECTION 1 |