ldbl-opt: Add err, errx, verr, verrx, warn, warnx, vwarn, and vwarnx (bug 23984)

When support for long double format with 128-bits (-mlong-double-128)
was added for platforms where long double had the same format as double,
such as powerpc, compatibility versions for the functions listed in the
commit title were missed.  Since the older format of long double can
still be used (with -mlong-double-64), using these functions with a
format string that requests the printing of long double variables will
produce wrong outputs.

This patch adds the missing compatibility functions and header magic to
redirect calls to them when -mlong-double-64 is in use.

Tested for powerpc, powerpc64 and powerpc64le.

3 files changed, 36 insertions, 1 deletions

diff --git a/misc/Makefile b/misc/Makefile
index cf0daa1..6cb660b 100644
--- a/misc/Makefile
+++ b/misc/Makefile
@@ -36,7 +36,8 @@ headers	:= sys/uio.h bits/uio-ext.h bits/uio_lim.h \
 	   syslog.h sys/syslog.h \
 	   bits/syslog.h bits/syslog-ldbl.h bits/syslog-path.h bits/error.h \
 	   bits/select2.h bits/hwcap.h sys/auxv.h \
-	   sys/sysmacros.h bits/sysmacros.h bits/types/struct_iovec.h
+	   sys/sysmacros.h bits/sysmacros.h bits/types/struct_iovec.h \
+	   bits/err-ldbl.h
 
 routines := brk sbrk sstk ioctl \
 	    readv writev preadv preadv64 pwritev pwritev64 \
diff --git a/misc/bits/err-ldbl.h b/misc/bits/err-ldbl.h
new file mode 100644
index 0000000..e62f679
--- /dev/null
+++ b/misc/bits/err-ldbl.h
@@ -0,0 +1,30 @@
+/* Redirections for err.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 _ERR_H
+# error "Never include <bits/err-ldbl.h> directly; use <err.h> instead."
+#endif
+
+__LDBL_REDIR_DECL (warn)
+__LDBL_REDIR_DECL (vwarn)
+__LDBL_REDIR_DECL (warnx)
+__LDBL_REDIR_DECL (vwarnx)
+__LDBL_REDIR_DECL (err)
+__LDBL_REDIR_DECL (verr)
+__LDBL_REDIR_DECL (errx)
+__LDBL_REDIR_DECL (verrx)
diff --git a/misc/err.h b/misc/err.h
index 4690d04..4dfd9a6 100644
--- a/misc/err.h
+++ b/misc/err.h
@@ -52,6 +52,10 @@ extern void errx (int __status, const char *__format, ...)
 extern void verrx (int __status, const char *, __gnuc_va_list)
      __attribute__ ((__noreturn__, __format__ (__printf__, 2, 0)));
 
+#ifdef __LDBL_COMPAT
+# include <bits/err-ldbl.h>
+#endif
+
 __END_DECLS
 
 #endif	/* err.h */