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74 lines
2.9 KiB
Plaintext
74 lines
2.9 KiB
Plaintext
dnl 'extern inline' a la ISO C99.
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dnl Copyright 2012-2013 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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[/* _GL_INLINE is a portable alternative to ISO C99 plain 'inline'.
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_GL_EXTERN_INLINE is a portable alternative to 'extern inline'.
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_GL_INLINE_HEADER_BEGIN contains useful stuff to put
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in an include file, before uses of _GL_INLINE.
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It suppresses GCC's bogus "no previous prototype for 'FOO'" diagnostic,
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when FOO is an inline function in the header; see
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<http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113>.
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_GL_INLINE_HEADER_END contains useful stuff to put
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in the same include file, after uses of _GL_INLINE.
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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 the use of extern inline on Apple's platforms, as Libc at least
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through Libc-825.26 (2013-04-09) is incompatible with it; see, e.g.,
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<http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>.
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Perhaps Apple will fix this some day. */
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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 __APPLE__)
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# define _GL_INLINE inline
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# define _GL_EXTERN_INLINE extern inline
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#elif 2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __APPLE__
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# if __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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#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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#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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