1dnl 'extern inline' a la ISO C99. 2 3dnl Copyright 2012-2013 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 Apple's platforms, as Libc at least 23 through Libc-825.26 (2013-04-09) is incompatible with it; see, e.g., 24 <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>. 25 Perhaps Apple will fix this some day. */ 26#if ((__GNUC__ \ 27 ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \ 28 : (199901L <= __STDC_VERSION__ \ 29 && !defined __HP_cc \ 30 && !(defined __SUNPRO_C && __STDC__))) \ 31 && !defined __APPLE__) 32# define _GL_INLINE inline 33# define _GL_EXTERN_INLINE extern inline 34#elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \ 35 && !defined __APPLE__) 36# if __GNUC_GNU_INLINE__ 37 /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */ 38# define _GL_INLINE extern inline __attribute__ ((__gnu_inline__)) 39# else 40# define _GL_INLINE extern inline 41# endif 42# define _GL_EXTERN_INLINE extern 43#else 44# define _GL_INLINE static _GL_UNUSED 45# define _GL_EXTERN_INLINE static _GL_UNUSED 46#endif 47 48#if 4 < __GNUC__ + (6 <= __GNUC_MINOR__) 49# if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ 50# define _GL_INLINE_HEADER_CONST_PRAGMA 51# else 52# define _GL_INLINE_HEADER_CONST_PRAGMA \ 53 _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"") 54# endif 55 /* Suppress GCC's bogus "no previous prototype for 'FOO'" 56 and "no previous declaration for 'FOO'" diagnostics, 57 when FOO is an inline function in the header; see 58 <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113>. */ 59# define _GL_INLINE_HEADER_BEGIN \ 60 _Pragma ("GCC diagnostic push") \ 61 _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \ 62 _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \ 63 _GL_INLINE_HEADER_CONST_PRAGMA 64# define _GL_INLINE_HEADER_END \ 65 _Pragma ("GCC diagnostic pop") 66#else 67# define _GL_INLINE_HEADER_BEGIN 68# define _GL_INLINE_HEADER_END 69#endif]) 70]) 71