| /* ANSI and traditional C compatability macros |
| Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, |
| 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2013 |
| Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
| |
| /* ANSI and traditional C compatibility macros |
| |
| ANSI C is assumed if __STDC__ is #defined. |
| |
| Macro ANSI C definition Traditional C definition |
| ----- ---- - ---------- ----------- - ---------- |
| PTR `void *' `char *' |
| const not defined `' |
| volatile not defined `' |
| signed not defined `' |
| |
| For ease of writing code which uses GCC extensions but needs to be |
| portable to other compilers, we provide the GCC_VERSION macro that |
| simplifies testing __GNUC__ and __GNUC_MINOR__ together, and various |
| wrappers around __attribute__. Also, __extension__ will be #defined |
| to nothing if it doesn't work. See below. */ |
| |
| #ifndef _ANSIDECL_H |
| #define _ANSIDECL_H 1 |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* Every source file includes this file, |
| so they will all get the switch for lint. */ |
| /* LINTLIBRARY */ |
| |
| /* Using MACRO(x,y) in cpp #if conditionals does not work with some |
| older preprocessors. Thus we can't define something like this: |
| |
| #define HAVE_GCC_VERSION(MAJOR, MINOR) \ |
| (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR))) |
| |
| and then test "#if HAVE_GCC_VERSION(2,7)". |
| |
| So instead we use the macro below and test it against specific values. */ |
| |
| /* This macro simplifies testing whether we are using gcc, and if it |
| is of a particular minimum version. (Both major & minor numbers are |
| significant.) This macro will evaluate to 0 if we are not using |
| gcc at all. */ |
| #ifndef GCC_VERSION |
| #define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__) |
| #endif /* GCC_VERSION */ |
| |
| #if defined (__STDC__) || defined(__cplusplus) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32) |
| /* All known AIX compilers implement these things (but don't always |
| define __STDC__). The RISC/OS MIPS compiler defines these things |
| in SVR4 mode, but does not define __STDC__. */ |
| /* eraxxon@alumni.rice.edu: The Compaq C++ compiler, unlike many other |
| C++ compilers, does not define __STDC__, though it acts as if this |
| was so. (Verified versions: 5.7, 6.2, 6.3, 6.5) */ |
| |
| #define PTR void * |
| |
| #undef const |
| #undef volatile |
| #undef signed |
| |
| /* inline requires special treatment; it's in C99, and GCC >=2.7 supports |
| it too, but it's not in C89. */ |
| #undef inline |
| #if __STDC_VERSION__ >= 199901L || defined(__cplusplus) || (defined(__SUNPRO_C) && defined(__C99FEATURES__)) |
| /* it's a keyword */ |
| #else |
| # if GCC_VERSION >= 2007 |
| # define inline __inline__ /* __inline__ prevents -pedantic warnings */ |
| # else |
| # define inline /* nothing */ |
| # endif |
| #endif |
| |
| #else /* Not ANSI C. */ |
| |
| #define PTR char * |
| |
| /* some systems define these in header files for non-ansi mode */ |
| #undef const |
| #undef volatile |
| #undef signed |
| #undef inline |
| #define const |
| #define volatile |
| #define signed |
| #define inline |
| |
| #endif /* ANSI C. */ |
| |
| /* Define macros for some gcc attributes. This permits us to use the |
| macros freely, and know that they will come into play for the |
| version of gcc in which they are supported. */ |
| |
| #if (GCC_VERSION < 2007) |
| # define __attribute__(x) |
| #endif |
| |
| /* Attribute __malloc__ on functions was valid as of gcc 2.96. */ |
| #ifndef ATTRIBUTE_MALLOC |
| # if (GCC_VERSION >= 2096) |
| # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__)) |
| # else |
| # define ATTRIBUTE_MALLOC |
| # endif /* GNUC >= 2.96 */ |
| #endif /* ATTRIBUTE_MALLOC */ |
| |
| /* Attributes on labels were valid as of gcc 2.93 and g++ 4.5. For |
| g++ an attribute on a label must be followed by a semicolon. */ |
| #ifndef ATTRIBUTE_UNUSED_LABEL |
| # ifndef __cplusplus |
| # if GCC_VERSION >= 2093 |
| # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED |
| # else |
| # define ATTRIBUTE_UNUSED_LABEL |
| # endif |
| # else |
| # if GCC_VERSION >= 4005 |
| # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED ; |
| # else |
| # define ATTRIBUTE_UNUSED_LABEL |
| # endif |
| # endif |
| #endif |
| |
| /* Similarly to ARG_UNUSED below. Prior to GCC 3.4, the C++ frontend |
| couldn't parse attributes placed after the identifier name, and now |
| the entire compiler is built with C++. */ |
| #ifndef ATTRIBUTE_UNUSED |
| #if GCC_VERSION >= 3004 |
| # define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) |
| #else |
| #define ATTRIBUTE_UNUSED |
| #endif |
| #endif /* ATTRIBUTE_UNUSED */ |
| |
| /* Before GCC 3.4, the C++ frontend couldn't parse attributes placed after the |
| identifier name. */ |
| #if ! defined(__cplusplus) || (GCC_VERSION >= 3004) |
| # define ARG_UNUSED(NAME) NAME ATTRIBUTE_UNUSED |
| #else /* !__cplusplus || GNUC >= 3.4 */ |
| # define ARG_UNUSED(NAME) NAME |
| #endif /* !__cplusplus || GNUC >= 3.4 */ |
| |
| #ifndef ATTRIBUTE_NORETURN |
| #define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__)) |
| #endif /* ATTRIBUTE_NORETURN */ |
| |
| /* Attribute `nonnull' was valid as of gcc 3.3. */ |
| #ifndef ATTRIBUTE_NONNULL |
| # if (GCC_VERSION >= 3003) |
| # define ATTRIBUTE_NONNULL(m) __attribute__ ((__nonnull__ (m))) |
| # else |
| # define ATTRIBUTE_NONNULL(m) |
| # endif /* GNUC >= 3.3 */ |
| #endif /* ATTRIBUTE_NONNULL */ |
| |
| /* Attribute `returns_nonnull' was valid as of gcc 4.9. */ |
| #ifndef ATTRIBUTE_RETURNS_NONNULL |
| # if (GCC_VERSION >= 4009) |
| # define ATTRIBUTE_RETURNS_NONNULL __attribute__ ((__returns_nonnull__)) |
| # else |
| # define ATTRIBUTE_RETURNS_NONNULL |
| # endif /* GNUC >= 4.9 */ |
| #endif /* ATTRIBUTE_RETURNS_NONNULL */ |
| |
| /* Attribute `pure' was valid as of gcc 3.0. */ |
| #ifndef ATTRIBUTE_PURE |
| # if (GCC_VERSION >= 3000) |
| # define ATTRIBUTE_PURE __attribute__ ((__pure__)) |
| # else |
| # define ATTRIBUTE_PURE |
| # endif /* GNUC >= 3.0 */ |
| #endif /* ATTRIBUTE_PURE */ |
| |
| /* Use ATTRIBUTE_PRINTF when the format specifier must not be NULL. |
| This was the case for the `printf' format attribute by itself |
| before GCC 3.3, but as of 3.3 we need to add the `nonnull' |
| attribute to retain this behavior. */ |
| #ifndef ATTRIBUTE_PRINTF |
| #define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n))) ATTRIBUTE_NONNULL(m) |
| #define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2) |
| #define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3) |
| #define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4) |
| #define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5) |
| #define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6) |
| #endif /* ATTRIBUTE_PRINTF */ |
| |
| /* Use ATTRIBUTE_FPTR_PRINTF when the format attribute is to be set on |
| a function pointer. Format attributes were allowed on function |
| pointers as of gcc 3.1. */ |
| #ifndef ATTRIBUTE_FPTR_PRINTF |
| # if (GCC_VERSION >= 3001) |
| # define ATTRIBUTE_FPTR_PRINTF(m, n) ATTRIBUTE_PRINTF(m, n) |
| # else |
| # define ATTRIBUTE_FPTR_PRINTF(m, n) |
| # endif /* GNUC >= 3.1 */ |
| # define ATTRIBUTE_FPTR_PRINTF_1 ATTRIBUTE_FPTR_PRINTF(1, 2) |
| # define ATTRIBUTE_FPTR_PRINTF_2 ATTRIBUTE_FPTR_PRINTF(2, 3) |
| # define ATTRIBUTE_FPTR_PRINTF_3 ATTRIBUTE_FPTR_PRINTF(3, 4) |
| # define ATTRIBUTE_FPTR_PRINTF_4 ATTRIBUTE_FPTR_PRINTF(4, 5) |
| # define ATTRIBUTE_FPTR_PRINTF_5 ATTRIBUTE_FPTR_PRINTF(5, 6) |
| #endif /* ATTRIBUTE_FPTR_PRINTF */ |
| |
| /* Use ATTRIBUTE_NULL_PRINTF when the format specifier may be NULL. A |
| NULL format specifier was allowed as of gcc 3.3. */ |
| #ifndef ATTRIBUTE_NULL_PRINTF |
| # if (GCC_VERSION >= 3003) |
| # define ATTRIBUTE_NULL_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n))) |
| # else |
| # define ATTRIBUTE_NULL_PRINTF(m, n) |
| # endif /* GNUC >= 3.3 */ |
| # define ATTRIBUTE_NULL_PRINTF_1 ATTRIBUTE_NULL_PRINTF(1, 2) |
| # define ATTRIBUTE_NULL_PRINTF_2 ATTRIBUTE_NULL_PRINTF(2, 3) |
| # define ATTRIBUTE_NULL_PRINTF_3 ATTRIBUTE_NULL_PRINTF(3, 4) |
| # define ATTRIBUTE_NULL_PRINTF_4 ATTRIBUTE_NULL_PRINTF(4, 5) |
| # define ATTRIBUTE_NULL_PRINTF_5 ATTRIBUTE_NULL_PRINTF(5, 6) |
| #endif /* ATTRIBUTE_NULL_PRINTF */ |
| |
| /* Attribute `sentinel' was valid as of gcc 3.5. */ |
| #ifndef ATTRIBUTE_SENTINEL |
| # if (GCC_VERSION >= 3005) |
| # define ATTRIBUTE_SENTINEL __attribute__ ((__sentinel__)) |
| # else |
| # define ATTRIBUTE_SENTINEL |
| # endif /* GNUC >= 3.5 */ |
| #endif /* ATTRIBUTE_SENTINEL */ |
| |
| |
| #ifndef ATTRIBUTE_ALIGNED_ALIGNOF |
| # if (GCC_VERSION >= 3000) |
| # define ATTRIBUTE_ALIGNED_ALIGNOF(m) __attribute__ ((__aligned__ (__alignof__ (m)))) |
| # else |
| # define ATTRIBUTE_ALIGNED_ALIGNOF(m) |
| # endif /* GNUC >= 3.0 */ |
| #endif /* ATTRIBUTE_ALIGNED_ALIGNOF */ |
| |
| /* Useful for structures whose layout must much some binary specification |
| regardless of the alignment and padding qualities of the compiler. */ |
| #ifndef ATTRIBUTE_PACKED |
| # define ATTRIBUTE_PACKED __attribute__ ((packed)) |
| #endif |
| |
| /* Attribute `hot' and `cold' was valid as of gcc 4.3. */ |
| #ifndef ATTRIBUTE_COLD |
| # if (GCC_VERSION >= 4003) |
| # define ATTRIBUTE_COLD __attribute__ ((__cold__)) |
| # else |
| # define ATTRIBUTE_COLD |
| # endif /* GNUC >= 4.3 */ |
| #endif /* ATTRIBUTE_COLD */ |
| #ifndef ATTRIBUTE_HOT |
| # if (GCC_VERSION >= 4003) |
| # define ATTRIBUTE_HOT __attribute__ ((__hot__)) |
| # else |
| # define ATTRIBUTE_HOT |
| # endif /* GNUC >= 4.3 */ |
| #endif /* ATTRIBUTE_HOT */ |
| |
| /* We use __extension__ in some places to suppress -pedantic warnings |
| about GCC extensions. This feature didn't work properly before |
| gcc 2.8. */ |
| #if GCC_VERSION < 2008 |
| #define __extension__ |
| #endif |
| |
| /* This is used to declare a const variable which should be visible |
| outside of the current compilation unit. Use it as |
| EXPORTED_CONST int i = 1; |
| This is because the semantics of const are different in C and C++. |
| "extern const" is permitted in C but it looks strange, and gcc |
| warns about it when -Wc++-compat is not used. */ |
| #ifdef __cplusplus |
| #define EXPORTED_CONST extern const |
| #else |
| #define EXPORTED_CONST const |
| #endif |
| |
| /* Be conservative and only use enum bitfields with C++ or GCC. |
| FIXME: provide a complete autoconf test for buggy enum bitfields. */ |
| |
| #ifdef __cplusplus |
| #define ENUM_BITFIELD(TYPE) enum TYPE |
| #elif (GCC_VERSION > 2000) |
| #define ENUM_BITFIELD(TYPE) __extension__ enum TYPE |
| #else |
| #define ENUM_BITFIELD(TYPE) unsigned int |
| #endif |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* ansidecl.h */ |
