m4/btowc.m4

   1 # btowc.m4 serial 10
   2 dnl Copyright (C) 2008-2012 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 AC_DEFUN([gl_FUNC_BTOWC],
   8 [
   9   AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
  10
  11   dnl Check whether <wchar.h> is usable at all, first. Otherwise the test
  12   dnl program below may lead to an endless loop. See
  13   dnl <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>.
  14   AC_REQUIRE([gl_WCHAR_H_INLINE_OK])
  15
  16   AC_CHECK_FUNCS_ONCE([btowc])
  17   if test $ac_cv_func_btowc = no; then
  18     HAVE_BTOWC=0
  19   else
  20
  21     AC_REQUIRE([AC_PROG_CC])
  22     AC_REQUIRE([gt_LOCALE_FR])
  23     AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  24
  25     dnl Cygwin 1.7.2 btowc('\0') is WEOF, not 0.
  26     AC_CACHE_CHECK([whether btowc(0) is correct],
  27       [gl_cv_func_btowc_nul],
  28       [
  29         AC_RUN_IFELSE(
  30           [AC_LANG_SOURCE([[
  31 #include <string.h>
  32 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
  33    <wchar.h>.
  34    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
  35    included before <wchar.h>.  */
  36 #include <stddef.h>
  37 #include <stdio.h>
  38 #include <time.h>
  39 #include <wchar.h>
  40 int main ()
  41 {
  42   if (btowc ('\0') != 0)
  43     return 1;
  44   return 0;
  45 }]])],
  46           [gl_cv_func_btowc_nul=yes],
  47           [gl_cv_func_btowc_nul=no],
  48           [
  49 changequote(,)dnl
  50            case "$host_os" in
  51                       # Guess no on Cygwin.
  52              cygwin*) gl_cv_func_btowc_nul="guessing no" ;;
  53                       # Guess yes otherwise.
  54              *)       gl_cv_func_btowc_nul="guessing yes" ;;
  55            esac
  56 changequote([,])dnl
  57           ])
  58       ])
  59
  60     dnl IRIX 6.5 btowc(EOF) is 0xFF, not WEOF.
  61     AC_CACHE_CHECK([whether btowc(EOF) is correct],
  62       [gl_cv_func_btowc_eof],
  63       [
  64         dnl Initial guess, used when cross-compiling or when no suitable locale
  65         dnl is present.
  66 changequote(,)dnl
  67         case "$host_os" in
  68                  # Guess no on IRIX.
  69           irix*) gl_cv_func_btowc_eof="guessing no" ;;
  70                  # Guess yes otherwise.
  71           *)     gl_cv_func_btowc_eof="guessing yes" ;;
  72         esac
  73 changequote([,])dnl
  74         if test $LOCALE_FR != none; then
  75           AC_RUN_IFELSE(
  76             [AC_LANG_SOURCE([[
  77 #include <locale.h>
  78 #include <string.h>
  79 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
  80    <wchar.h>.
  81    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
  82    included before <wchar.h>.  */
  83 #include <stddef.h>
  84 #include <stdio.h>
  85 #include <time.h>
  86 #include <wchar.h>
  87 int main ()
  88 {
  89   if (setlocale (LC_ALL, "$LOCALE_FR") != NULL)
  90     {
  91       if (btowc (EOF) != WEOF)
  92         return 1;
  93     }
  94   return 0;
  95 }]])],
  96             [gl_cv_func_btowc_eof=yes],
  97             [gl_cv_func_btowc_eof=no],
  98             [:])
  99         fi
 100       ])
 101
 102     case "$gl_cv_func_btowc_nul" in
 103       *yes) ;;
 104       *) REPLACE_BTOWC=1 ;;
 105     esac
 106     case "$gl_cv_func_btowc_eof" in
 107       *yes) ;;
 108       *) REPLACE_BTOWC=1 ;;
 109     esac
 110   fi
 111 ])
 112
 113 # Prerequisites of lib/btowc.c.
 114 AC_DEFUN([gl_PREREQ_BTOWC], [
 115   :
 116 ])