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102 lines
4.3 KiB
102 lines
4.3 KiB
dnl 'extern inline' a la ISO C99. |
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dnl Copyright 2012-2017 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 __PGI \ |
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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 4.6 (inclusive) to 5.1 (exclusive), |
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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 __GNUC__ == 4 && 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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