ldbl-opt: Add error and error_at_line (bug 23984)

On platforms where long double may have the same format as double
(-mlong-double-64), error and error_at_line do not take that into
account and might produce wrong output if a long double conversion is
requested by the format string ('%Lf').  This patch adds compatibility
functions for this situation and redirects calls via header magic.

Tested for powerpc, powerpc64 and powerpc64le.

1 files changed, 24 insertions, 0 deletions

diff --git a/misc/bits/error-ldbl.h b/misc/bits/error-ldbl.h
new file mode 100644
index 0000000000..c3883da299
--- /dev/null
+++ b/misc/bits/error-ldbl.h
@@ -0,0 +1,24 @@
+/* Redirections for error.h functions for -mlong-double-64.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _ERROR_H
+# error "Never include <bits/error-ldbl.h> directly; use <error.h> instead."
+#endif
+
+__LDBL_REDIR_DECL (error)
+__LDBL_REDIR_DECL (error_at_line)