unistr/u*-strchr: add tests

[gnulib.git] / m4 / open.m4

diff --git a/m4/open.m4 b/m4/open.m4
index fab0ad9..d705b3a 100644 (file)
--- a/m4/open.m4
+++ b/m4/open.m4
@@ -1,24 +1,27 @@
-# open.m4 serial 3
-dnl Copyright (C) 2007-2008 Free Software Foundation, Inc.
+# open.m4 serial 8
+dnl Copyright (C) 2007-2010 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.
 
 AC_DEFUN([gl_FUNC_OPEN],
 [
-  AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
   AC_REQUIRE([AC_CANONICAL_HOST])
   case "$host_os" in
     mingw* | pw*)
-      REPLACE_OPEN=1
-      AC_LIBOBJ([open])
+      gl_REPLACE_OPEN
       ;;
     *)
       dnl open("foo/") should not create a file when the file name has a
-      dnl trailing slash.
+      dnl trailing slash.  FreeBSD only has the problem on symlinks.
+      AC_CHECK_FUNCS_ONCE([lstat])
       AC_CACHE_CHECK([whether open recognizes a trailing slash],
         [gl_cv_func_open_slash],
-        [
+        [# Assume that if we have lstat, we can also check symlinks.
+          if test $ac_cv_func_lstat = yes; then
+            touch conftest.tmp
+            ln -s conftest.tmp conftest.lnk
+          fi
           AC_TRY_RUN([
 #include <fcntl.h>
 #if HAVE_UNISTD_H
@@ -26,34 +29,46 @@ AC_DEFUN([gl_FUNC_OPEN],
 #endif
 int main ()
 {
+#if HAVE_LSTAT
+  if (open ("conftest.lnk/", O_RDONLY) != -1) return 2;
+#endif
   return open ("conftest.sl/", O_CREAT, 0600) >= 0;
 }], [gl_cv_func_open_slash=yes], [gl_cv_func_open_slash=no],
             [
 changequote(,)dnl
              case "$host_os" in
+               freebsd*)        gl_cv_func_open_slash="guessing no" ;;
                solaris2.[0-9]*) gl_cv_func_open_slash="guessing no" ;;
                hpux*)           gl_cv_func_open_slash="guessing no" ;;
                *)               gl_cv_func_open_slash="guessing yes" ;;
              esac
 changequote([,])dnl
             ])
-          rm -f conftest.sl
+          rm -f conftest.sl conftest.tmp conftest.lnk
         ])
       case "$gl_cv_func_open_slash" in
         *no)
-          AC_DEFINE([OPEN_TRAILING_SLASH_BUG], 1,
+          AC_DEFINE([OPEN_TRAILING_SLASH_BUG], [1],
             [Define to 1 if open() fails to recognize a trailing slash.])
-          REPLACE_OPEN=1
-          AC_LIBOBJ([open])
-          gl_PREREQ_OPEN
+          gl_REPLACE_OPEN
           ;;
       esac
       ;;
   esac
 ])
 
+AC_DEFUN([gl_REPLACE_OPEN],
+[
+  AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
+  REPLACE_OPEN=1
+  AC_LIBOBJ([open])
+  gl_PREREQ_OPEN
+])
+
 # Prerequisites of lib/open.c.
 AC_DEFUN([gl_PREREQ_OPEN],
 [
   AC_REQUIRE([AC_C_INLINE])
+  AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])
+  :
 ])