1 # extern-inline.m4 serial 2
2 dnl 'extern inline' a la ISO C99.
4 dnl Copyright 2012-2013 Free Software Foundation, Inc.
5 dnl This file is free software; the Free Software Foundation
6 dnl gives unlimited permission to copy and/or distribute it,
7 dnl with or without modifications, as long as this notice is preserved.
9 AC_DEFUN([gl_EXTERN_INLINE],
11 AH_VERBATIM([extern_inline],
12 [/* Please see the Gnulib manual for how to use these macros.
14 Suppress extern inline with HP-UX cc, as it appears to be broken; see
15 <http://lists.gnu.org/archive/html/bug-texinfo/2013-02/msg00030.html>.
17 Suppress extern inline with Sun C in standards-conformance mode, as it
18 mishandles inline functions that call each other. E.g., for 'inline void f
19 (void) { } inline void g (void) { f (); }', c99 incorrectly complains
20 'reference to static identifier "f" in extern inline function'.
21 This bug was observed with Sun C 5.12 SunOS_i386 2011/11/16.
23 Suppress the use of extern inline on problematic Apple configurations, as
24 Libc at least through Libc-825.26 (2013-04-09) mishandles it; see, e.g.,
25 <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>.
26 Perhaps Apple will fix this some day. */
27 #if (defined __APPLE__ \
28 && ((! defined _DONT_USE_CTYPE_INLINE_ \
29 && (defined __GNUC__ || defined __cplusplus)) \
30 || (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \
31 && defined __GNUC__ && ! defined __cplusplus)))
32 # define _GL_EXTERN_INLINE_APPLE_BUG
35 ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
36 : (199901L <= __STDC_VERSION__ \
38 && !(defined __SUNPRO_C && __STDC__))) \
39 && !defined _GL_EXTERN_INLINE_APPLE_BUG)
40 # define _GL_INLINE inline
41 # define _GL_EXTERN_INLINE extern inline
42 # define _GL_EXTERN_INLINE_IN_USE
43 #elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \
44 && !defined _GL_EXTERN_INLINE_APPLE_BUG)
45 # if defined __GNUC_GNU_INLINE__ && __GNUC_GNU_INLINE__
46 /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */
47 # define _GL_INLINE extern inline __attribute__ ((__gnu_inline__))
49 # define _GL_INLINE extern inline
51 # define _GL_EXTERN_INLINE extern
52 # define _GL_EXTERN_INLINE_IN_USE
54 # define _GL_INLINE static _GL_UNUSED
55 # define _GL_EXTERN_INLINE static _GL_UNUSED
58 #if 4 < __GNUC__ + (6 <= __GNUC_MINOR__)
59 # if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__
60 # define _GL_INLINE_HEADER_CONST_PRAGMA
62 # define _GL_INLINE_HEADER_CONST_PRAGMA \
63 _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"")
65 /* Suppress GCC's bogus "no previous prototype for 'FOO'"
66 and "no previous declaration for 'FOO'" diagnostics,
67 when FOO is an inline function in the header; see
68 <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113>. */
69 # define _GL_INLINE_HEADER_BEGIN \
70 _Pragma ("GCC diagnostic push") \
71 _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \
72 _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \
73 _GL_INLINE_HEADER_CONST_PRAGMA
74 # define _GL_INLINE_HEADER_END \
75 _Pragma ("GCC diagnostic pop")
77 # define _GL_INLINE_HEADER_BEGIN
78 # define _GL_INLINE_HEADER_END