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libiconv 1.16

    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: ])