| 1 | dnl 'extern inline' a la ISO C99. |
| 2 | |
| 3 | dnl Copyright 2012-2013 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 extern inline with HP-UX cc, as it appears to be broken; see |
| 22 | <http://lists.gnu.org/archive/html/bug-texinfo/2013-02/msg00030.html>. |
| 23 | |
| 24 | Suppress extern inline with Sun C in standards-conformance mode, as it |
| 25 | mishandles inline functions that call each other. E.g., for 'inline void f |
| 26 | (void) { } inline void g (void) { f (); }', c99 incorrectly complains |
| 27 | 'reference to static identifier "f" in extern inline function'. |
| 28 | This bug was observed with Sun C 5.12 SunOS_i386 2011/11/16. |
| 29 | |
| 30 | Suppress the use of extern inline on Apple's platforms, as Libc at least |
| 31 | through Libc-825.26 (2013-04-09) is incompatible with it; see, e.g., |
| 32 | <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>. |
| 33 | Perhaps Apple will fix this some day. */ |
| 34 | #if ((__GNUC__ \ |
| 35 | ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \ |
| 36 | : (199901L <= __STDC_VERSION__ \ |
| 37 | && !defined __HP_cc \ |
| 38 | && !(defined __SUNPRO_C && __STDC__))) \ |
| 39 | && !defined __APPLE__) |
| 40 | # define _GL_INLINE inline |
| 41 | # define _GL_EXTERN_INLINE extern inline |
| 42 | #elif 2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __APPLE__ |
| 43 | # if __GNUC_GNU_INLINE__ |
| 44 | /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */ |
| 45 | # define _GL_INLINE extern inline __attribute__ ((__gnu_inline__)) |
| 46 | # else |
| 47 | # define _GL_INLINE extern inline |
| 48 | # endif |
| 49 | # define _GL_EXTERN_INLINE extern |
| 50 | #else |
| 51 | # define _GL_INLINE static _GL_UNUSED |
| 52 | # define _GL_EXTERN_INLINE static _GL_UNUSED |
| 53 | #endif |
| 54 | |
| 55 | #if 4 < __GNUC__ + (6 <= __GNUC_MINOR__) |
| 56 | # if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ |
| 57 | # define _GL_INLINE_HEADER_CONST_PRAGMA |
| 58 | # else |
| 59 | # define _GL_INLINE_HEADER_CONST_PRAGMA \ |
| 60 | _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"") |
| 61 | # endif |
| 62 | # define _GL_INLINE_HEADER_BEGIN \ |
| 63 | _Pragma ("GCC diagnostic push") \ |
| 64 | _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \ |
| 65 | _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \ |
| 66 | _GL_INLINE_HEADER_CONST_PRAGMA |
| 67 | # define _GL_INLINE_HEADER_END \ |
| 68 | _Pragma ("GCC diagnostic pop") |
| 69 | #else |
| 70 | # define _GL_INLINE_HEADER_BEGIN |
| 71 | # define _GL_INLINE_HEADER_END |
| 72 | #endif]) |
| 73 | ]) |