1dnl 'extern inline' a la ISO C99. 2 3dnl Copyright 2012-2018 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 <https://lists.gnu.org/r/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 extern inline (with or without __attribute__ ((__gnu_inline__))) 23 on configurations that mistakenly use 'static inline' to implement 24 functions or macros in standard C headers like <ctype.h>. For example, 25 if isdigit is mistakenly implemented via a static inline function, 26 a program containing an extern inline function that calls isdigit 27 may not work since the C standard prohibits extern inline functions 28 from calling static functions. This bug is known to occur on: 29 30 OS X 10.8 and earlier; see: 31 https://lists.gnu.org/r/bug-gnulib/2012-12/msg00023.html 32 33 DragonFly; see 34 http://muscles.dragonflybsd.org/bulk/bleeding-edge-potential/latest-per-pkg/ah-tty-0.3.12.log 35 36 FreeBSD; see: 37 https://lists.gnu.org/r/bug-gnulib/2014-07/msg00104.html 38 39 OS X 10.9 has a macro __header_inline indicating the bug is fixed for C and 40 for clang but remains for g++; see <https://trac.macports.org/ticket/41033>. 41 Assume DragonFly and FreeBSD will be similar. */ 42#if (((defined __APPLE__ && defined __MACH__) \ 43 || defined __DragonFly__ || defined __FreeBSD__) \ 44 && (defined __header_inline \ 45 ? (defined __cplusplus && defined __GNUC_STDC_INLINE__ \ 46 && ! defined __clang__) \ 47 : ((! defined _DONT_USE_CTYPE_INLINE_ \ 48 && (defined __GNUC__ || defined __cplusplus)) \ 49 || (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \ 50 && defined __GNUC__ && ! defined __cplusplus)))) 51# define _GL_EXTERN_INLINE_STDHEADER_BUG 52#endif 53#if ((__GNUC__ \ 54 ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \ 55 : (199901L <= __STDC_VERSION__ \ 56 && !defined __HP_cc \ 57 && !defined __PGI \ 58 && !(defined __SUNPRO_C && __STDC__))) \ 59 && !defined _GL_EXTERN_INLINE_STDHEADER_BUG) 60# define _GL_INLINE inline 61# define _GL_EXTERN_INLINE extern inline 62# define _GL_EXTERN_INLINE_IN_USE 63#elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \ 64 && !defined _GL_EXTERN_INLINE_STDHEADER_BUG) 65# if defined __GNUC_GNU_INLINE__ && __GNUC_GNU_INLINE__ 66 /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */ 67# define _GL_INLINE extern inline __attribute__ ((__gnu_inline__)) 68# else 69# define _GL_INLINE extern inline 70# endif 71# define _GL_EXTERN_INLINE extern 72# define _GL_EXTERN_INLINE_IN_USE 73#else 74# define _GL_INLINE static _GL_UNUSED 75# define _GL_EXTERN_INLINE static _GL_UNUSED 76#endif 77 78/* In GCC 4.6 (inclusive) to 5.1 (exclusive), 79 suppress bogus "no previous prototype for 'FOO'" 80 and "no previous declaration for 'FOO'" diagnostics, 81 when FOO is an inline function in the header; see 82 <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113> and 83 <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63877>. */ 84#if __GNUC__ == 4 && 6 <= __GNUC_MINOR__ 85# if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ 86# define _GL_INLINE_HEADER_CONST_PRAGMA 87# else 88# define _GL_INLINE_HEADER_CONST_PRAGMA \ 89 _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"") 90# endif 91# define _GL_INLINE_HEADER_BEGIN \ 92 _Pragma ("GCC diagnostic push") \ 93 _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \ 94 _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \ 95 _GL_INLINE_HEADER_CONST_PRAGMA 96# define _GL_INLINE_HEADER_END \ 97 _Pragma ("GCC diagnostic pop") 98#else 99# define _GL_INLINE_HEADER_BEGIN 100# define _GL_INLINE_HEADER_END 101#endif]) 102]) 103