openat: fix unlinkat bugs on Solaris 9

[gnulib.git] / m4 / wctype.m4

diff --git a/m4/wctype.m4 b/m4/wctype.m4
index c24e75f..b611ebb 100644 (file)
--- a/m4/wctype.m4
+++ b/m4/wctype.m4
@@ -1,6 +1,8 @@
+# wctype.m4 serial 4
+
 dnl A placeholder for ISO C99 <wctype.h>, for platforms that lack it.
 
-dnl Copyright (C) 2006 Free Software Foundation, Inc.
+dnl Copyright (C) 2006-2009 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.
@@ -9,51 +11,74 @@ dnl Written by Paul Eggert.
 
 AC_DEFUN([gl_WCTYPE_H],
 [
+  AC_REQUIRE([AC_PROG_CC])
+  AC_REQUIRE([AC_CANONICAL_HOST])
   AC_CHECK_FUNCS_ONCE([iswcntrl])
+  if test $ac_cv_func_iswcntrl = yes; then
+    HAVE_ISWCNTRL=1
+  else
+    HAVE_ISWCNTRL=0
+  fi
+  AC_SUBST([HAVE_ISWCNTRL])
   AC_CHECK_HEADERS_ONCE([wctype.h])
   AC_REQUIRE([AC_C_INLINE])
 
   AC_REQUIRE([gt_TYPE_WINT_T])
+  if test $gt_cv_c_wint_t = yes; then
+    HAVE_WINT_T=1
+  else
+    HAVE_WINT_T=0
+  fi
   AC_SUBST([HAVE_WINT_T])
 
+  WCTYPE_H=wctype.h
   if test $ac_cv_header_wctype_h = yes; then
-    gl_ABSOLUTE_HEADER([wctype.h])
-    ABSOLUTE_WCTYPE_H=\"$gl_cv_absolute_wctype_h\"
+    if test $ac_cv_func_iswcntrl = yes; then
+      dnl Linux libc5 has an iswprint function that returns 0 for all arguments.
+      dnl The other functions are likely broken in the same way.
+      AC_CACHE_CHECK([whether iswcntrl works], [gl_cv_func_iswcntrl_works],
+        [
+          AC_RUN_IFELSE([AC_LANG_SOURCE([[
+                            #include <stddef.h>
+                            #include <stdio.h>
+                            #include <time.h>
+                            #include <wchar.h>
+                            #include <wctype.h>
+                            int main () { return iswprint ('x') == 0; }]])],
+            [gl_cv_func_iswcntrl_works=yes], [gl_cv_func_iswcntrl_works=no],
+            [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdlib.h>
+                          #if __GNU_LIBRARY__ == 1
+                          Linux libc5 i18n is broken.
+                          #endif]], [])],
+              [gl_cv_func_iswcntrl_works=yes], [gl_cv_func_iswcntrl_works=no])
+            ])
+        ])
+      if test $gl_cv_func_iswcntrl_works = yes; then
+        case "$host_os" in
+          mingw*)
+            dnl On mingw, towlower and towupper return random high 16 bits.
+            ;;
+          *)
+            dnl iswcntrl works. towlower and towupper work as well.
+            WCTYPE_H=
+            ;;
+        esac
+      fi
+    fi
+    dnl Compute NEXT_WCTYPE_H even if WCTYPE_H is empty,
+    dnl for the benefit of builds from non-distclean directories.
+    gl_CHECK_NEXT_HEADERS([wctype.h])
     HAVE_WCTYPE_H=1
   else
-    ABSOLUTE_WCTYPE_H=\"no/such/file/wctype.h\"
     HAVE_WCTYPE_H=0
   fi
-  AC_SUBST([ABSOLUTE_WCTYPE_H])
   AC_SUBST([HAVE_WCTYPE_H])
+  AC_SUBST([WCTYPE_H])
 
-  WCTYPE_H=wctype.h
-  HAVE_WCTYPE_CTMP_BUG=0
-  if test $ac_cv_header_wctype_h = yes; then
-    dnl IRIX 5.3 has a bug: its isw* macros reference an undefined variable
-    dnl _ctmp_. Test against this bug.
-    AC_CACHE_CHECK([whether wctype macros need _ctmp_ declared],
-      [gl_cv_wctype_ctmp_bug],
-      [gl_cv_wctype_ctmp_bug=no
-       AC_COMPILE_IFELSE(
-         [AC_LANG_PROGRAM(
-           [[#include <wctype.h>
-           ]],
-           [[return iswprint (0);]])],
-        [gl_cv_wctype_ctmp_bug='no, but bare wctype.h does not work'],
-        [AC_COMPILE_IFELSE(
-           [AC_LANG_PROGRAM(
-              [[#include <wctype.h>
-                static wint_t _ctmp_;]],
-              [[return iswprint (0);]])],
-           [gl_cv_wctype_ctmp_bug=yes])])])
-    case $gl_cv_wctype_ctmp_bug,$ac_cv_func_iswcntrl in #(
-      yes,*)
-       HAVE_WCTYPE_CTMP_BUG=1;; #(
-      no,yes)
-       WCTYPE_H=;;
-    esac
+  if test "$gl_cv_func_iswcntrl_works" = no; then
+    REPLACE_ISWCNTRL=1
+  else
+    REPLACE_ISWCNTRL=0
   fi
-  AC_SUBST([WCTYPE_H])
-  AC_SUBST([HAVE_WCTYPE_CTMP_BUG])
+  AC_SUBST([REPLACE_ISWCNTRL])
 ])