diff options
Diffstat (limited to 'misc/sys/cdefs.h')
| -rw-r--r-- | misc/sys/cdefs.h | 147 |
1 files changed, 105 insertions, 42 deletions
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h index 7fd41549db..3f6fe3cc85 100644 --- a/misc/sys/cdefs.h +++ b/misc/sys/cdefs.h @@ -1,4 +1,4 @@ -/* Copyright (C) 1992-2016 Free Software Foundation, Inc. +/* Copyright (C) 1992-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -55,21 +55,29 @@ # 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) # define __THROW throw () # define __THROWNL throw () # define __NTH(fct) __LEAF_ATTR fct throw () +# define __NTHNL(fct) fct throw () # else # define __THROW # define __THROWNL # define __NTH(fct) fct +# define __NTHNL(fct) fct # endif # endif #else /* Not GCC. */ -# define __inline /* No inline functions. */ +# if (defined __cplusplus \ + || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) +# define __inline inline +# else +# define __inline /* No inline functions. */ +# endif # define __THROW # define __THROWNL @@ -77,6 +85,15 @@ #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 + /* These two macros are not used in glibc anymore. They are kept here only because some other projects expect the macros to be defined. */ #define __P(args) args @@ -90,7 +107,6 @@ /* This is not a typedef so `const __ptr_t' does the right thing. */ #define __ptr_t void * -#define __long_double_t long double /* C++ needs to know that types and declarations are C, not C++. */ @@ -103,31 +119,6 @@ #endif -/* The standard library needs the functions from the ISO C90 standard - in the std namespace. At the same time we want to be safe for - future changes and we include the ISO C99 code in the non-standard - namespace __c99. The C++ wrapper header take case of adding the - definitions to the global namespace. */ -#if defined __cplusplus && defined _GLIBCPP_USE_NAMESPACES -# define __BEGIN_NAMESPACE_STD namespace std { -# define __END_NAMESPACE_STD } -# define __USING_NAMESPACE_STD(name) using std::name; -# define __BEGIN_NAMESPACE_C99 namespace __c99 { -# define __END_NAMESPACE_C99 } -# define __USING_NAMESPACE_C99(name) using __c99::name; -#else -/* For compatibility we do not add the declarations into any - namespace. They will end up in the global namespace which is what - old code expects. */ -# define __BEGIN_NAMESPACE_STD -# define __END_NAMESPACE_STD -# define __USING_NAMESPACE_STD(name) -# define __BEGIN_NAMESPACE_C99 -# define __END_NAMESPACE_C99 -# define __USING_NAMESPACE_C99(name) -#endif - - /* Fortify support. */ #define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1) #define __bos0(ptr) __builtin_object_size (ptr, 0) @@ -144,21 +135,27 @@ # define __errordecl(name, msg) extern void name (void) #endif -/* Support for flexible arrays. */ -#if __GNUC_PREREQ (2,97) -/* GCC 2.97 supports C99 flexible array members. */ +/* Support for flexible arrays. + 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 +# define __flexarr [] +# define __glibc_c99_flexarr_available 1 +#elif __GNUC_PREREQ (2,97) +/* GCC 2.97 supports 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 +#elif defined __GNUC__ +/* Pre-2.97 GCC did not support C99 flexible arrays but did have + an equivalent extension with slightly different notation. */ +# define __flexarr [0] +# define __glibc_c99_flexarr_available 1 #else -# ifdef __GNUC__ -# define __flexarr [0] -# else -# if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L -# define __flexarr [] -# else /* Some other non-C99 compiler. Approximate with [1]. */ -# define __flexarr [1] -# endif -# endif +# define __flexarr [1] +# define __glibc_c99_flexarr_available 0 #endif @@ -249,13 +246,24 @@ # define __attribute_noinline__ /* Ignore */ #endif -/* gcc allows marking deprecated functions. */ +/* Since version 3.2, gcc allows marking deprecated functions. */ #if __GNUC_PREREQ (3,2) # define __attribute_deprecated__ __attribute__ ((__deprecated__)) #else # define __attribute_deprecated__ /* Ignore */ #endif +/* Since version 4.5, gcc also allows one to specify the message printed + 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__) +# define __attribute_deprecated_msg__(msg) \ + __attribute__ ((__deprecated__ (msg))) +#else +# define __attribute_deprecated_msg__(msg) __attribute_deprecated__ +#endif + /* At some point during the gcc 2.8 development the `format_arg' attribute for functions was introduced. We don't want to use it unconditionally (although this would be possible) since it generates warnings. @@ -304,8 +312,13 @@ /* Forces a function to be always inlined. */ #if __GNUC_PREREQ (3,2) +/* 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. */ +# undef __always_inline # define __always_inline __inline __attribute__ ((__always_inline__)) #else +# undef __always_inline # define __always_inline __inline #endif @@ -360,7 +373,11 @@ /* __restrict is known in EGCS 1.2 and above. */ #if !__GNUC_PREREQ (2,92) -# define __restrict /* Ignore */ +# if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L +# define __restrict restrict +# else +# define __restrict /* Ignore */ +# endif #endif /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is @@ -389,6 +406,12 @@ # 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)) @@ -399,6 +422,15 @@ # endif #endif +#if __GNUC_PREREQ (8, 0) +/* Describes a char array whose address can safely be passed as the first + argument to strncpy and strncat, as the char array is not necessarily + a NUL-terminated string. */ +# define __attribute_nonstring__ __attribute__ ((__nonstring__)) +#else +# define __attribute_nonstring__ +#endif + #if (!defined _Static_assert && !defined __cplusplus \ && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \ && (!__GNUC_PREREQ (4, 6) || defined __STRICT_ANSI__)) @@ -408,6 +440,7 @@ #endif #include <bits/wordsize.h> +#include <bits/long-double.h> #if defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH # define __LDBL_COMPAT 1 @@ -441,4 +474,34 @@ # endif #endif +/* __glibc_macro_warning (MESSAGE) issues warning MESSAGE. This is + intended for use in preprocessor macros. + + Note: MESSAGE must be a _single_ string; concatenation of string + literals is not supported. */ +#if __GNUC_PREREQ (4,8) || __glibc_clang_prereq (3,5) +# define __glibc_macro_warning1(message) _Pragma (#message) +# define __glibc_macro_warning(message) \ + __glibc_macro_warning1 (GCC warning message) +#else +# define __glibc_macro_warning(msg) +#endif + +/* 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 !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 +#endif + #endif /* sys/cdefs.h */ |