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101 lines
4.2 KiB
Plaintext
101 lines
4.2 KiB
Plaintext
dnl 'extern inline' a la ISO C99.
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dnl Copyright 2012-2015 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_EXTERN_INLINE],
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[
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AH_VERBATIM([extern_inline],
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[/* Please see the Gnulib manual for how to use these macros.
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Suppress extern inline with HP-UX cc, as it appears to be broken; see
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<http://lists.gnu.org/archive/html/bug-texinfo/2013-02/msg00030.html>.
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Suppress extern inline with Sun C in standards-conformance mode, as it
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mishandles inline functions that call each other. E.g., for 'inline void f
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(void) { } inline void g (void) { f (); }', c99 incorrectly complains
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'reference to static identifier "f" in extern inline function'.
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This bug was observed with Sun C 5.12 SunOS_i386 2011/11/16.
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Suppress extern inline (with or without __attribute__ ((__gnu_inline__)))
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on configurations that mistakenly use 'static inline' to implement
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functions or macros in standard C headers like <ctype.h>. For example,
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if isdigit is mistakenly implemented via a static inline function,
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a program containing an extern inline function that calls isdigit
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may not work since the C standard prohibits extern inline functions
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from calling static functions. This bug is known to occur on:
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OS X 10.8 and earlier; see:
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http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html
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DragonFly; see
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http://muscles.dragonflybsd.org/bulk/bleeding-edge-potential/latest-per-pkg/ah-tty-0.3.12.log
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FreeBSD; see:
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http://lists.gnu.org/archive/html/bug-gnulib/2014-07/msg00104.html
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OS X 10.9 has a macro __header_inline indicating the bug is fixed for C and
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for clang but remains for g++; see <http://trac.macports.org/ticket/41033>.
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Assume DragonFly and FreeBSD will be similar. */
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#if (((defined __APPLE__ && defined __MACH__) \
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|| defined __DragonFly__ || defined __FreeBSD__) \
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&& (defined __header_inline \
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? (defined __cplusplus && defined __GNUC_STDC_INLINE__ \
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&& ! defined __clang__) \
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: ((! defined _DONT_USE_CTYPE_INLINE_ \
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&& (defined __GNUC__ || defined __cplusplus)) \
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|| (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \
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&& defined __GNUC__ && ! defined __cplusplus))))
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# define _GL_EXTERN_INLINE_STDHEADER_BUG
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#endif
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#if ((__GNUC__ \
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? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
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: (199901L <= __STDC_VERSION__ \
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&& !defined __HP_cc \
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&& !(defined __SUNPRO_C && __STDC__))) \
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&& !defined _GL_EXTERN_INLINE_STDHEADER_BUG)
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# define _GL_INLINE inline
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# define _GL_EXTERN_INLINE extern inline
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# define _GL_EXTERN_INLINE_IN_USE
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#elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \
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&& !defined _GL_EXTERN_INLINE_STDHEADER_BUG)
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# if defined __GNUC_GNU_INLINE__ && __GNUC_GNU_INLINE__
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/* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */
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# define _GL_INLINE extern inline __attribute__ ((__gnu_inline__))
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# else
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# define _GL_INLINE extern inline
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# endif
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# define _GL_EXTERN_INLINE extern
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# define _GL_EXTERN_INLINE_IN_USE
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#else
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# define _GL_INLINE static _GL_UNUSED
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# define _GL_EXTERN_INLINE static _GL_UNUSED
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#endif
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/* In GCC, suppress bogus "no previous prototype for 'FOO'"
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and "no previous declaration for 'FOO'" diagnostics,
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when FOO is an inline function in the header; see
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<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113> and
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<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63877>. */
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#if 4 < __GNUC__ + (6 <= __GNUC_MINOR__)
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# if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__
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# define _GL_INLINE_HEADER_CONST_PRAGMA
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# else
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# define _GL_INLINE_HEADER_CONST_PRAGMA \
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_Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"")
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# endif
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# define _GL_INLINE_HEADER_BEGIN \
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_Pragma ("GCC diagnostic push") \
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_Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \
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_Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \
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_GL_INLINE_HEADER_CONST_PRAGMA
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# define _GL_INLINE_HEADER_END \
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_Pragma ("GCC diagnostic pop")
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#else
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# define _GL_INLINE_HEADER_BEGIN
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# define _GL_INLINE_HEADER_END
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#endif])
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])
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