1 dnl 'extern inline' a la ISO C99. 2 3 dnl Copyright 2012 Free Software Foundation, Inc. 4 dnl This file is free software; the Free Software Foundation 5 dnl gives unlimited permission to copy and/or distribute it, 6 dnl with or without modifications, as long as this notice is preserved. 7 8 AC_DEFUN([gl_EXTERN_INLINE], 9 [ 10 AH_VERBATIM([extern_inline], 11 [/* _GL_INLINE is a portable alternative to ISO C99 plain 'inline'. 12 _GL_EXTERN_INLINE is a portable alternative to 'extern inline'. 13 _GL_INLINE_HEADER_BEGIN contains useful stuff to put 14 in an include file, before uses of _GL_INLINE. 15 It suppresses GCC's bogus "no previous prototype for 'FOO'" diagnostic, 16 when FOO is an inline function in the header; see 17 <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113>. 18 _GL_INLINE_HEADER_END contains useful stuff to put 19 in the same include file, after uses of _GL_INLINE. 20 21 Suppress the use of extern inline on Apple's platforms, 22 as Libc-825.25 (2012-09-19) is incompatible with it; see 23 <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>. 24 Perhaps Apple will fix this some day. */ 25 #if ((__GNUC__ \ 26 ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \ 27 : 199901L <= __STDC_VERSION__) \ 28 && !defined __APPLE__) 29 # define _GL_INLINE inline 30 # define _GL_EXTERN_INLINE extern inline 31 #elif 2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __APPLE__ 32 # if __GNUC_GNU_INLINE__ 33 /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */ 34 # define _GL_INLINE extern inline __attribute__ ((__gnu_inline__)) 35 # else 36 # define _GL_INLINE extern inline 37 # endif 38 # define _GL_EXTERN_INLINE extern 39 #else 40 # define _GL_INLINE static _GL_UNUSED 41 # define _GL_EXTERN_INLINE static _GL_UNUSED 42 #endif 43 44 #if 4 < __GNUC__ + (6 <= __GNUC_MINOR__) 45 # if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ 46 # define _GL_INLINE_HEADER_CONST_PRAGMA 47 # else 48 # define _GL_INLINE_HEADER_CONST_PRAGMA \ 49 _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"") 50 # endif 51 # define _GL_INLINE_HEADER_BEGIN \ 52 _Pragma ("GCC diagnostic push") \ 53 _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \ 54 _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \ 55 _GL_INLINE_HEADER_CONST_PRAGMA 56 # define _GL_INLINE_HEADER_END \ 57 _Pragma ("GCC diagnostic pop") 58 #else 59 # define _GL_INLINE_HEADER_BEGIN 60 # define _GL_INLINE_HEADER_END 61 #endif]) 62 ]) 63
