diff options
Diffstat (limited to 'gl/m4/btowc.m4')
| -rw-r--r-- | gl/m4/btowc.m4 | 45 |
1 files changed, 42 insertions, 3 deletions
diff --git a/gl/m4/btowc.m4 b/gl/m4/btowc.m4 index b46f74fb..c4ee4e41 100644 --- a/gl/m4/btowc.m4 +++ b/gl/m4/btowc.m4 @@ -1,5 +1,5 @@ -# btowc.m4 serial 4 -dnl Copyright (C) 2008-2009 Free Software Foundation, Inc. +# btowc.m4 serial 6 +dnl Copyright (C) 2008-2010 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. @@ -8,15 +8,49 @@ AC_DEFUN([gl_FUNC_BTOWC], [ AC_REQUIRE([gl_WCHAR_H_DEFAULTS]) + dnl Check whether <wchar.h> is usable at all, first. Otherwise the test + dnl program below may lead to an endless loop. See + dnl <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>. + AC_REQUIRE([gl_WCHAR_H_INLINE_OK]) + AC_CHECK_FUNCS_ONCE([btowc]) if test $ac_cv_func_btowc = no; then HAVE_BTOWC=0 else - dnl IRIX 6.5 btowc(EOF) is 0xFF, not WEOF. AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([gt_LOCALE_FR]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + + dnl Cygwin 1.7.2 btowc('\0') is WEOF, not 0. + AC_CACHE_CHECK([whether btowc(0) is correct], + [gl_cv_func_btowc_nul], + [ + AC_TRY_RUN([ +#include <stdio.h> +#include <string.h> +#include <wchar.h> +int main () +{ + if (btowc ('\0') != 0) + return 1; + return 0; +}], + [gl_cv_func_btowc_nul=yes], + [gl_cv_func_btowc_nul=no], + [ +changequote(,)dnl + case "$host_os" in + # Guess no on Cygwin. + cygwin*) gl_cv_func_btowc_nul="guessing no" ;; + # Guess yes otherwise. + *) gl_cv_func_btowc_nul="guessing yes" ;; + esac +changequote([,])dnl + ]) + ]) + + dnl IRIX 6.5 btowc(EOF) is 0xFF, not WEOF. AC_CACHE_CHECK([whether btowc(EOF) is correct], [gl_cv_func_btowc_eof], [ @@ -50,6 +84,11 @@ int main () [:]) fi ]) + + case "$gl_cv_func_btowc_nul" in + *yes) ;; + *) REPLACE_BTOWC=1 ;; + esac case "$gl_cv_func_btowc_eof" in *yes) ;; *) REPLACE_BTOWC=1 ;; |