maint: update copyright

[gnulib.git] / m4 / error.m4

diff --git a/m4/error.m4 b/m4/error.m4
index 71a79f7..f08ae50 100644 (file)
--- a/m4/error.m4
+++ b/m4/error.m4
@@ -1,20 +1,27 @@
-#serial 6
+#serial 14
+
+# Copyright (C) 1996-1998, 2001-2004, 2009-2014 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.
 
 AC_DEFUN([gl_ERROR],
 [
-  AC_FUNC_ERROR_AT_LINE
-  dnl Note: AC_FUNC_ERROR_AT_LINE does AC_LIBSOURCES([error.h, error.c]).
-  if test $ac_cv_lib_error_at_line = no; then
-    jm_PREREQ_ERROR
-  fi
+  dnl We don't use AC_FUNC_ERROR_AT_LINE any more, because it is no longer
+  dnl maintained in Autoconf and because it invokes AC_LIBOBJ.
+  AC_CACHE_CHECK([for error_at_line], [ac_cv_lib_error_at_line],
+    [AC_LINK_IFELSE(
+       [AC_LANG_PROGRAM(
+          [[#include <error.h>]],
+          [[error_at_line (0, 0, "", 0, "an error occurred");]])],
+       [ac_cv_lib_error_at_line=yes],
+       [ac_cv_lib_error_at_line=no])])
 ])
 
 # Prerequisites of lib/error.c.
-AC_DEFUN([jm_PREREQ_ERROR],
+AC_DEFUN([gl_PREREQ_ERROR],
 [
-  AC_REQUIRE([AC_HEADER_STDC])
-  AC_REQUIRE([AC_FUNC_VPRINTF])
-  AC_CHECK_FUNCS(strerror)
-  AC_CHECK_DECLS([strerror])
-  AC_FUNC_STRERROR_R
+  AC_REQUIRE([AC_FUNC_STRERROR_R])
+  :
 ])