symlinkat: new module

[gnulib.git] / m4 / symlinkat.m4

diff --git a/m4/symlinkat.m4 b/m4/symlinkat.m4
new file mode 100644 (file)
index 0000000..50d9954
--- /dev/null
+++ b/m4/symlinkat.m4
@@ -0,0 +1,22 @@
+# serial 1
+# See if we need to provide symlinkat/readlinkat replacement.
+
+dnl Copyright (C) 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.
+
+# Written by Eric Blake.
+
+AC_DEFUN([gl_FUNC_SYMLINKAT],
+[
+  AC_REQUIRE([gl_FUNC_OPENAT])
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+  AC_CHECK_FUNCS_ONCE([symlink symlinkat readlinkat])
+  if test $ac_cv_func_symlinkat = no; then
+    # No known system has readlinkat but not symlinkat
+    HAVE_SYMLINKAT=0
+    HAVE_READLINKAT=0
+    AC_LIBOBJ([symlinkat])
+  fi
+])