Annotation of embedaddon/libiconv/srcm4/extern-inline.m4, revision 1.1.1.1
1.1 misho 1: dnl 'extern inline' a la ISO C99.
2:
3: dnl Copyright 2012-2019 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: [/* 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: <https://lists.gnu.org/r/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 (ISO C 99 section 6.7.4.(3).
29: This bug is known to occur on:
30:
31: OS X 10.8 and earlier; see:
32: https://lists.gnu.org/r/bug-gnulib/2012-12/msg00023.html
33:
34: DragonFly; see
35: http://muscles.dragonflybsd.org/bulk/bleeding-edge-potential/latest-per-pkg/ah-tty-0.3.12.log
36:
37: FreeBSD; see:
38: https://lists.gnu.org/r/bug-gnulib/2014-07/msg00104.html
39:
40: OS X 10.9 has a macro __header_inline indicating the bug is fixed for C and
41: for clang but remains for g++; see <https://trac.macports.org/ticket/41033>.
42: Assume DragonFly and FreeBSD will be similar.
43:
44: GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
45: inline semantics, unless -fgnu89-inline is used. It defines a macro
46: __GNUC_STDC_INLINE__ to indicate this situation or a macro
47: __GNUC_GNU_INLINE__ to indicate the opposite situation.
48: GCC 4.2 with -std=c99 or -std=gnu99 implements the GNU C inline
49: semantics but warns, unless -fgnu89-inline is used:
50: warning: C99 inline functions are not supported; using GNU89
51: warning: to disable this warning use -fgnu89-inline or the gnu_inline function attribute
52: It defines a macro __GNUC_GNU_INLINE__ to indicate this situation.
53: */
54: #if (((defined __APPLE__ && defined __MACH__) \
55: || defined __DragonFly__ || defined __FreeBSD__) \
56: && (defined __header_inline \
57: ? (defined __cplusplus && defined __GNUC_STDC_INLINE__ \
58: && ! defined __clang__) \
59: : ((! defined _DONT_USE_CTYPE_INLINE_ \
60: && (defined __GNUC__ || defined __cplusplus)) \
61: || (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \
62: && defined __GNUC__ && ! defined __cplusplus))))
63: # define _GL_EXTERN_INLINE_STDHEADER_BUG
64: #endif
65: #if ((__GNUC__ \
66: ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
67: : (199901L <= __STDC_VERSION__ \
68: && !defined __HP_cc \
69: && !defined __PGI \
70: && !(defined __SUNPRO_C && __STDC__))) \
71: && !defined _GL_EXTERN_INLINE_STDHEADER_BUG)
72: # define _GL_INLINE inline
73: # define _GL_EXTERN_INLINE extern inline
74: # define _GL_EXTERN_INLINE_IN_USE
75: #elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \
76: && !defined _GL_EXTERN_INLINE_STDHEADER_BUG)
77: # if defined __GNUC_GNU_INLINE__ && __GNUC_GNU_INLINE__
78: /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */
79: # define _GL_INLINE extern inline __attribute__ ((__gnu_inline__))
80: # else
81: # define _GL_INLINE extern inline
82: # endif
83: # define _GL_EXTERN_INLINE extern
84: # define _GL_EXTERN_INLINE_IN_USE
85: #else
86: # define _GL_INLINE static _GL_UNUSED
87: # define _GL_EXTERN_INLINE static _GL_UNUSED
88: #endif
89:
90: /* In GCC 4.6 (inclusive) to 5.1 (exclusive),
91: suppress bogus "no previous prototype for 'FOO'"
92: and "no previous declaration for 'FOO'" diagnostics,
93: when FOO is an inline function in the header; see
94: <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113> and
95: <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63877>. */
96: #if __GNUC__ == 4 && 6 <= __GNUC_MINOR__
97: # if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__
98: # define _GL_INLINE_HEADER_CONST_PRAGMA
99: # else
100: # define _GL_INLINE_HEADER_CONST_PRAGMA \
101: _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"")
102: # endif
103: # define _GL_INLINE_HEADER_BEGIN \
104: _Pragma ("GCC diagnostic push") \
105: _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \
106: _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \
107: _GL_INLINE_HEADER_CONST_PRAGMA
108: # define _GL_INLINE_HEADER_END \
109: _Pragma ("GCC diagnostic pop")
110: #else
111: # define _GL_INLINE_HEADER_BEGIN
112: # define _GL_INLINE_HEADER_END
113: #endif])
114: ])
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