m4/extern-inline.m4

   1 # extern-inline.m4 serial 2
   2 dnl 'extern inline' a la ISO C99.
   3
   4 dnl Copyright 2012-2013 Free Software Foundation, Inc.
   5 dnl This file is free software; the Free Software Foundation
   6 dnl gives unlimited permission to copy and/or distribute it,
   7 dnl with or without modifications, as long as this notice is preserved.
   8
   9 AC_DEFUN([gl_EXTERN_INLINE],
  10 [
  11   AH_VERBATIM([extern_inline],
  12 [/* Please see the Gnulib manual for how to use these macros.
  13
  14    Suppress extern inline with HP-UX cc, as it appears to be broken; see
  15    <http://lists.gnu.org/archive/html/bug-texinfo/2013-02/msg00030.html>.
  16
  17    Suppress extern inline with Sun C in standards-conformance mode, as it
  18    mishandles inline functions that call each other.  E.g., for 'inline void f
  19    (void) { } inline void g (void) { f (); }', c99 incorrectly complains
  20    'reference to static identifier "f" in extern inline function'.
  21    This bug was observed with Sun C 5.12 SunOS_i386 2011/11/16.
  22
  23    Suppress the use of extern inline on problematic Apple configurations, as
  24    Libc at least through Libc-825.26 (2013-04-09) mishandles it; see, e.g.,
  25    <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>.
  26    Perhaps Apple will fix this some day.  */
  27 #if (defined __APPLE__ \
  28      && ((! defined _DONT_USE_CTYPE_INLINE_ \
  29           && (defined __GNUC__ || defined __cplusplus)) \
  30          || (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \
  31              && defined __GNUC__ && ! defined __cplusplus)))
  32 # define _GL_EXTERN_INLINE_APPLE_BUG
  33 #endif
  34 #if ((__GNUC__ \
  35       ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
  36       : (199901L <= __STDC_VERSION__ \
  37          && !defined __HP_cc \
  38          && !(defined __SUNPRO_C && __STDC__))) \
  39      && !defined _GL_EXTERN_INLINE_APPLE_BUG)
  40 # define _GL_INLINE inline
  41 # define _GL_EXTERN_INLINE extern inline
  42 # define _GL_EXTERN_INLINE_IN_USE
  43 #elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \
  44        && !defined _GL_EXTERN_INLINE_APPLE_BUG)
  45 # if defined __GNUC_GNU_INLINE__ && __GNUC_GNU_INLINE__
  46    /* __gnu_inline__ suppresses a GCC 4.2 diagnostic.  */
  47 #  define _GL_INLINE extern inline __attribute__ ((__gnu_inline__))
  48 # else
  49 #  define _GL_INLINE extern inline
  50 # endif
  51 # define _GL_EXTERN_INLINE extern
  52 # define _GL_EXTERN_INLINE_IN_USE
  53 #else
  54 # define _GL_INLINE static _GL_UNUSED
  55 # define _GL_EXTERN_INLINE static _GL_UNUSED
  56 #endif
  57
  58 #if 4 < __GNUC__ + (6 <= __GNUC_MINOR__)
  59 # if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__
  60 #  define _GL_INLINE_HEADER_CONST_PRAGMA
  61 # else
  62 #  define _GL_INLINE_HEADER_CONST_PRAGMA \
  63      _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"")
  64 # endif
  65   /* Suppress GCC's bogus "no previous prototype for 'FOO'"
  66      and "no previous declaration for 'FOO'"  diagnostics,
  67      when FOO is an inline function in the header; see
  68      <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113>.  */
  69 # define _GL_INLINE_HEADER_BEGIN \
  70     _Pragma ("GCC diagnostic push") \
  71     _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \
  72     _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \
  73     _GL_INLINE_HEADER_CONST_PRAGMA
  74 # define _GL_INLINE_HEADER_END \
  75     _Pragma ("GCC diagnostic pop")
  76 #else
  77 # define _GL_INLINE_HEADER_BEGIN
  78 # define _GL_INLINE_HEADER_END
  79 #endif])
  80 ])