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a512b375 JB |
1 | dnl 'extern inline' a la ISO C99. |
2 | ||
49e4877c | 3 | dnl Copyright 2012-2016 Free Software Foundation, Inc. |
a512b375 JB |
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], | |
4a626d0a PA |
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 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 | http://lists.gnu.org/archive/html/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 | http://lists.gnu.org/archive/html/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 <http://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 | |
a512b375 JB |
53 | #if ((__GNUC__ \ |
54 | ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \ | |
4a626d0a PA |
55 | : (199901L <= __STDC_VERSION__ \ |
56 | && !defined __HP_cc \ | |
49e4877c | 57 | && !defined __PGI \ |
4a626d0a PA |
58 | && !(defined __SUNPRO_C && __STDC__))) \ |
59 | && !defined _GL_EXTERN_INLINE_STDHEADER_BUG) | |
a512b375 JB |
60 | # define _GL_INLINE inline |
61 | # define _GL_EXTERN_INLINE extern inline | |
4a626d0a PA |
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__ | |
a512b375 JB |
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 | |
4a626d0a | 72 | # define _GL_EXTERN_INLINE_IN_USE |
a512b375 JB |
73 | #else |
74 | # define _GL_INLINE static _GL_UNUSED | |
75 | # define _GL_EXTERN_INLINE static _GL_UNUSED | |
76 | #endif | |
77 | ||
4a626d0a PA |
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__ | |
a512b375 JB |
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 | ]) |