1dnl 'extern inline' a la ISO C99. 2 3dnl Copyright 2012-2014 Free Software Foundation, Inc. 4dnl This file is free software; the Free Software Foundation 5dnl gives unlimited permission to copy and/or distribute it, 6dnl with or without modifications, as long as this notice is preserved. 7 8AC_DEFUN([gl_EXTERN_INLINE], 9[ 10 AH_VERBATIM([extern_inline], 11[/* Please see the Gnulib manual for how to use these macros. 12 13 Suppress extern inline with HP-UX cc, as it appears to be broken; see 14 <http://lists.gnu.org/archive/html/bug-texinfo/2013-02/msg00030.html>. 15 16 Suppress extern inline with Sun C in standards-conformance mode, as it 17 mishandles inline functions that call each other. E.g., for 'inline void f 18 (void) { } inline void g (void) { f (); }', c99 incorrectly complains 19 'reference to static identifier "f" in extern inline function'. 20 This bug was observed with Sun C 5.12 SunOS_i386 2011/11/16. 21 22 Suppress the use of extern inline on problematic Apple configurations. 23 OS X 10.8 and earlier mishandle it; see, e.g., 24 <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>. 25 OS X 10.9 has a macro __header_inline indicating the bug is fixed for C and 26 for clang but remains for g++; see <http://trac.macports.org/ticket/41033>. 27 Perhaps Apple will fix this some day. */ 28#if (defined __APPLE__ \ 29 && (defined __header_inline \ 30 ? (defined __cplusplus && defined __GNUC_STDC_INLINE__ \ 31 && ! defined __clang__) \ 32 : ((! defined _DONT_USE_CTYPE_INLINE_ \ 33 && (defined __GNUC__ || defined __cplusplus)) \ 34 || (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \ 35 && defined __GNUC__ && ! defined __cplusplus)))) 36# define _GL_EXTERN_INLINE_APPLE_BUG 37#endif 38#if ((__GNUC__ \ 39 ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \ 40 : (199901L <= __STDC_VERSION__ \ 41 && !defined __HP_cc \ 42 && !(defined __SUNPRO_C && __STDC__))) \ 43 && !defined _GL_EXTERN_INLINE_APPLE_BUG) 44# define _GL_INLINE inline 45# define _GL_EXTERN_INLINE extern inline 46# define _GL_EXTERN_INLINE_IN_USE 47#elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \ 48 && !defined _GL_EXTERN_INLINE_APPLE_BUG) 49# if defined __GNUC_GNU_INLINE__ && __GNUC_GNU_INLINE__ 50 /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */ 51# define _GL_INLINE extern inline __attribute__ ((__gnu_inline__)) 52# else 53# define _GL_INLINE extern inline 54# endif 55# define _GL_EXTERN_INLINE extern 56# define _GL_EXTERN_INLINE_IN_USE 57#else 58# define _GL_INLINE static _GL_UNUSED 59# define _GL_EXTERN_INLINE static _GL_UNUSED 60#endif 61 62#if 4 < __GNUC__ + (6 <= __GNUC_MINOR__) 63# if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ 64# define _GL_INLINE_HEADER_CONST_PRAGMA 65# else 66# define _GL_INLINE_HEADER_CONST_PRAGMA \ 67 _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"") 68# endif 69 /* Suppress GCC's bogus "no previous prototype for 'FOO'" 70 and "no previous declaration for 'FOO'" diagnostics, 71 when FOO is an inline function in the header; see 72 <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113>. */ 73# define _GL_INLINE_HEADER_BEGIN \ 74 _Pragma ("GCC diagnostic push") \ 75 _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \ 76 _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \ 77 _GL_INLINE_HEADER_CONST_PRAGMA 78# define _GL_INLINE_HEADER_END \ 79 _Pragma ("GCC diagnostic pop") 80#else 81# define _GL_INLINE_HEADER_BEGIN 82# define _GL_INLINE_HEADER_END 83#endif]) 84]) 85