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-rw-r--r--gl/m4/extern-inline.m496
1 files changed, 78 insertions, 18 deletions
diff --git a/gl/m4/extern-inline.m4 b/gl/m4/extern-inline.m4
index c4c5e7f..c001b1c 100644
--- a/gl/m4/extern-inline.m4
+++ b/gl/m4/extern-inline.m4
@@ -1,61 +1,121 @@
1dnl 'extern inline' a la ISO C99. 1dnl 'extern inline' a la ISO C99.
2 2
3dnl Copyright 2012-2013 Free Software Foundation, Inc. 3dnl Copyright 2012-2023 Free Software Foundation, Inc.
4dnl This file is free software; the Free Software Foundation 4dnl This file is free software; the Free Software Foundation
5dnl gives unlimited permission to copy and/or distribute it, 5dnl gives unlimited permission to copy and/or distribute it,
6dnl with or without modifications, as long as this notice is preserved. 6dnl with or without modifications, as long as this notice is preserved.
7 7
8AC_DEFUN([gl_EXTERN_INLINE], 8AC_DEFUN([gl_EXTERN_INLINE],
9[ 9[
10 AH_VERBATIM([extern_inline], 10 AC_CACHE_CHECK([whether ctype.h defines __header_inline],
11 [gl_cv_have___header_inline],
12 [AC_PREPROC_IFELSE(
13 [AC_LANG_SOURCE([[#include <ctype.h>
14 #ifndef __header_inline
15 #error "<ctype.h> does not define __header_inline"
16 #endif
17 ]])],
18 [gl_cv_have___header_inline=yes],
19 [gl_cv_have___header_inline=no])])
20 if test "$gl_cv_have___header_inline" = yes; then
21 AC_DEFINE([HAVE___HEADER_INLINE], [1],
22 [Define to 1 if ctype.h defines __header_inline.])
23 fi
24
25 AH_VERBATIM([HAVE___HEADER_INLINE_1],
11[/* Please see the Gnulib manual for how to use these macros. 26[/* Please see the Gnulib manual for how to use these macros.
12 27
13 Suppress extern inline with HP-UX cc, as it appears to be broken; see 28 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>. 29 <https://lists.gnu.org/r/bug-texinfo/2013-02/msg00030.html>.
15 30
16 Suppress extern inline with Sun C in standards-conformance mode, as it 31 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 32 mishandles inline functions that call each other. E.g., for 'inline void f
18 (void) { } inline void g (void) { f (); }', c99 incorrectly complains 33 (void) { } inline void g (void) { f (); }', c99 incorrectly complains
19 'reference to static identifier "f" in extern inline function'. 34 'reference to static identifier "f" in extern inline function'.
20 This bug was observed with Sun C 5.12 SunOS_i386 2011/11/16. 35 This bug was observed with Oracle Developer Studio 12.6
36 (Sun C 5.15 SunOS_sparc 2017/05/30).
37
38 Suppress extern inline (with or without __attribute__ ((__gnu_inline__)))
39 on configurations that mistakenly use 'static inline' to implement
40 functions or macros in standard C headers like <ctype.h>. For example,
41 if isdigit is mistakenly implemented via a static inline function,
42 a program containing an extern inline function that calls isdigit
43 may not work since the C standard prohibits extern inline functions
44 from calling static functions (ISO C 99 section 6.7.4.(3).
45 This bug is known to occur on:
46
47 OS X 10.8 and earlier; see:
48 https://lists.gnu.org/r/bug-gnulib/2012-12/msg00023.html
49
50 DragonFly; see
51 http://muscles.dragonflybsd.org/bulk/clang-master-potential/20141111_102002/logs/ah-tty-0.3.12.log
21 52
22 Suppress the use of extern inline on Apple's platforms, as Libc at least 53 FreeBSD; see:
23 through Libc-825.26 (2013-04-09) is incompatible with it; see, e.g., 54 https://lists.gnu.org/r/bug-gnulib/2014-07/msg00104.html
24 <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>. 55
25 Perhaps Apple will fix this some day. */ 56 OS X 10.9 has a macro __header_inline indicating the bug is fixed for C and
57 for clang but remains for g++; see <https://trac.macports.org/ticket/41033>.
58 Assume DragonFly and FreeBSD will be similar.
59
60 GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
61 inline semantics, unless -fgnu89-inline is used. It defines a macro
62 __GNUC_STDC_INLINE__ to indicate this situation or a macro
63 __GNUC_GNU_INLINE__ to indicate the opposite situation.
64 GCC 4.2 with -std=c99 or -std=gnu99 implements the GNU C inline
65 semantics but warns, unless -fgnu89-inline is used:
66 warning: C99 inline functions are not supported; using GNU89
67 warning: to disable this warning use -fgnu89-inline or the gnu_inline function attribute
68 It defines a macro __GNUC_GNU_INLINE__ to indicate this situation.
69 */
70#if (((defined __APPLE__ && defined __MACH__) \
71 || defined __DragonFly__ || defined __FreeBSD__) \
72 && (defined HAVE___HEADER_INLINE \
73 ? (defined __cplusplus && defined __GNUC_STDC_INLINE__ \
74 && ! defined __clang__) \
75 : ((! defined _DONT_USE_CTYPE_INLINE_ \
76 && (defined __GNUC__ || defined __cplusplus)) \
77 || (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \
78 && defined __GNUC__ && ! defined __cplusplus))))
79# define _GL_EXTERN_INLINE_STDHEADER_BUG
80#endif
26#if ((__GNUC__ \ 81#if ((__GNUC__ \
27 ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \ 82 ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
28 : (199901L <= __STDC_VERSION__ \ 83 : (199901L <= __STDC_VERSION__ \
29 && !defined __HP_cc \ 84 && !defined __HP_cc \
85 && !defined __PGI \
30 && !(defined __SUNPRO_C && __STDC__))) \ 86 && !(defined __SUNPRO_C && __STDC__))) \
31 && !defined __APPLE__) 87 && !defined _GL_EXTERN_INLINE_STDHEADER_BUG)
32# define _GL_INLINE inline 88# define _GL_INLINE inline
33# define _GL_EXTERN_INLINE extern inline 89# define _GL_EXTERN_INLINE extern inline
90# define _GL_EXTERN_INLINE_IN_USE
34#elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \ 91#elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \
35 && !defined __APPLE__) 92 && !defined _GL_EXTERN_INLINE_STDHEADER_BUG)
36# if __GNUC_GNU_INLINE__ 93# if defined __GNUC_GNU_INLINE__ && __GNUC_GNU_INLINE__
37 /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */ 94 /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */
38# define _GL_INLINE extern inline __attribute__ ((__gnu_inline__)) 95# define _GL_INLINE extern inline __attribute__ ((__gnu_inline__))
39# else 96# else
40# define _GL_INLINE extern inline 97# define _GL_INLINE extern inline
41# endif 98# endif
42# define _GL_EXTERN_INLINE extern 99# define _GL_EXTERN_INLINE extern
100# define _GL_EXTERN_INLINE_IN_USE
43#else 101#else
44# define _GL_INLINE static _GL_UNUSED 102# define _GL_INLINE _GL_UNUSED static
45# define _GL_EXTERN_INLINE static _GL_UNUSED 103# define _GL_EXTERN_INLINE _GL_UNUSED static
46#endif 104#endif
47 105
48#if 4 < __GNUC__ + (6 <= __GNUC_MINOR__) 106/* In GCC 4.6 (inclusive) to 5.1 (exclusive),
107 suppress bogus "no previous prototype for 'FOO'"
108 and "no previous declaration for 'FOO'" diagnostics,
109 when FOO is an inline function in the header; see
110 <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113> and
111 <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63877>. */
112#if __GNUC__ == 4 && 6 <= __GNUC_MINOR__
49# if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ 113# if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__
50# define _GL_INLINE_HEADER_CONST_PRAGMA 114# define _GL_INLINE_HEADER_CONST_PRAGMA
51# else 115# else
52# define _GL_INLINE_HEADER_CONST_PRAGMA \ 116# define _GL_INLINE_HEADER_CONST_PRAGMA \
53 _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"") 117 _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"")
54# endif 118# 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 \ 119# define _GL_INLINE_HEADER_BEGIN \
60 _Pragma ("GCC diagnostic push") \ 120 _Pragma ("GCC diagnostic push") \
61 _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \ 121 _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \