faccessat: Make the last change more robust.

* m4/faccessat.m4 (gl_FUNC_FACCESSAT): Require
gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK. Treat "guessing yes" like "yes".

Author: bhaible

ChangeLog

@@ -1,3 +1,9 @@
+2017-11-12  Bruno Haible  <[email protected]>
+
+	faccessat: Make the last change more robust.
+	* m4/faccessat.m4 (gl_FUNC_FACCESSAT): Require
+	gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK. Treat "guessing yes" like "yes".
+
 2017-11-11  Paul Eggert  <[email protected]>
 
 	faccessat: port to macOS (Bug#29231)

m4/faccessat.m4

@@ -1,4 +1,4 @@
-# serial 7
+# serial 8
 # See if we need to provide faccessat replacement.
 
 dnl Copyright (C) 2009-2017 Free Software Foundation, Inc.
@@ -11,15 +11,19 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_FACCESSAT],
 [
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
 
   dnl Persuade glibc <unistd.h> to declare faccessat().
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
 
   AC_CHECK_FUNCS_ONCE([faccessat])
   if test $ac_cv_func_faccessat = no; then
     HAVE_FACCESSAT=0
-  elif test "$gl_cv_func_lstat_dereferences_slashed_symlink" != yes; then
-    REPLACE_FACCESSAT=1
+  else
+    case "$gl_cv_func_lstat_dereferences_slashed_symlink" in
+      *yes) ;;
+      *)    REPLACE_FACCESSAT=1 ;;
+    esac
   fi
 ])