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[gnulib.git] / m4 / lstat.m4

diff --git a/m4/lstat.m4 b/m4/lstat.m4
index bb2f754..5dbd16e 100644 (file)
--- a/m4/lstat.m4
+++ b/m4/lstat.m4
@@ -1,38 +1,28 @@
-#serial 1
+# serial 20
+
+# Copyright (C) 1997-2001, 2003-2010 Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
 
 dnl From Jim Meyering.
-dnl Determine whether lstat has the bug that it succeeds when given the
-dnl zero-length file name argument.  The lstat from SunOS4.1.4 does this.
-dnl
-dnl If it doesn't, arrange to use the replacement function.
-dnl
-dnl If you use this macro in a package, you should
-dnl add the following two lines to acconfig.h:
-dnl  /* Define to rpl_lstat if the replacement function should be used.  */
-dnl  #undef lstat
-dnl
 
-AC_DEFUN(jm_FUNC_LSTAT,
+AC_DEFUN([gl_FUNC_LSTAT],
 [
- AC_CACHE_CHECK([for working lstat], jm_cv_func_working_lstat,
-  [AC_TRY_RUN([
-#   include <sys/types.h>
-#   include <sys/stat.h>
-
-    int
-    main ()
-    {
-      struct stat sbuf;
-      exit (lstat ("", &sbuf) == 0 ? 1 : 0);
-    }
-         ],
-        jm_cv_func_working_lstat=yes,
-        jm_cv_func_working_lstat=no,
-        dnl When crosscompiling, assume lstat is broken.
-        jm_cv_func_working_lstat=no)
-  ])
-  if test $jm_cv_func_working_lstat = no; then
-    LIBOBJS="$LIBOBJS lstat.o"
-    AC_DEFINE_UNQUOTED(lstat, rpl_lstat)
+  AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
+  dnl If lstat does not exist, the replacement <sys/stat.h> does
+  dnl "#define lstat stat", and lstat.c is a no-op.
+  AC_CHECK_FUNCS_ONCE([lstat])
+  if test $ac_cv_func_lstat = yes; then
+    AC_REQUIRE([AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
+    if test $ac_cv_func_lstat_dereferences_slashed_symlink = no; then
+      dnl Note: AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK does AC_LIBOBJ([lstat]).
+      REPLACE_LSTAT=1
+    fi
+    # Prerequisites of lib/lstat.c.
+    AC_REQUIRE([AC_C_INLINE])
+  else
+    HAVE_LSTAT=0
   fi
 ])