Annotation of embedaddon/libiconv/srcm4/extern-inline.m4, revision 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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