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