Add lib/error.c

This new file was supposed to be part of 4d6dd0e5a "lib: avoid potential
problems with `-fno-common`".

Signed-off-by: Mark Wielaard <mark@klomp.org>

diff --git a/lib/error.c b/lib/error.c
new file mode 100644 (file)
index 0000000..75e964f
--- /dev/null
+++ b/lib/error.c
@@ -0,0 +1,49 @@
+/* Definitions for error fallback functions.
+   Copyright (C) 2021 Google, Inc.
+   This file is part of elfutils.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at
+       your option) any later version
+
+   or both in parallel, as here.
+
+   elfutils is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#if !defined(HAVE_ERROR_H) && defined(HAVE_ERR_H)
+#include <stdarg.h>
+#include <stdlib.h>
+#include <err.h>
+
+unsigned int error_message_count = 0;
+
+void error(int status, int errnum, const char *format, ...) {
+  va_list argp;
+
+  va_start(argp, format);
+  verr(status, format, argp);
+  va_end(argp);
+
+  if (status)
+    exit(status);
+  ++error_message_count;
+}
+#endif