Use C99's va_copy to avoid undefined behavior on x86-64 GNU/Linux.

2 files changed, 64 insertions, 1 deletions

diff --git a/lib/gnulib.mk b/lib/gnulib.mk
index faf89aaa0e6..1466e430a4c 100644
--- a/lib/gnulib.mk
+++ b/lib/gnulib.mk
@@ -9,7 +9,7 @@
 # the same distribution terms as the rest of that program.
 #
 # Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=. --makefile-name=gnulib.mk --no-libtool --macro-prefix=gl --no-vc-files careadlinkat crypto/md5 dtoastr filemode getloadavg getopt-gnu ignore-value intprops lstat mktime readlink socklen stdio strftime strtoumax symlink sys_stat
+# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=. --makefile-name=gnulib.mk --no-libtool --macro-prefix=gl --no-vc-files careadlinkat crypto/md5 dtoastr filemode getloadavg getopt-gnu ignore-value intprops lstat mktime readlink socklen stdarg stdio strftime strtoumax symlink sys_stat
 
 
 MOSTLYCLEANFILES += core *.stackdump
@@ -258,6 +258,33 @@ EXTRA_libgnu_a_SOURCES += stat.c
 
 ## end   gnulib module stat
 
+## begin gnulib module stdarg
+
+BUILT_SOURCES += $(STDARG_H)
+
+# We need the following in order to create <stdarg.h> when the system
+# doesn't have one that works with the given compiler.
+if GL_GENERATE_STDARG_H
+stdarg.h: stdarg.in.h $(top_builddir)/config.status
+        $(AM_V_GEN)rm -f $@-t $@ && \
+        { echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */' && \
+          sed -e 's|@''INCLUDE_NEXT''@|$(INCLUDE_NEXT)|g' \
+              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
+              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
+              -e 's|@''NEXT_STDARG_H''@|$(NEXT_STDARG_H)|g' \
+              < $(srcdir)/stdarg.in.h; \
+        } > $@-t && \
+        mv $@-t $@
+else
+stdarg.h: $(top_builddir)/config.status
+        rm -f $@
+endif
+MOSTLYCLEANFILES += stdarg.h stdarg.h-t
+
+EXTRA_DIST += stdarg.in.h
+
+## end   gnulib module stdarg
+
 ## begin gnulib module stdbool
 
 BUILT_SOURCES += $(STDBOOL_H)
diff --git a/lib/stdarg.in.h b/lib/stdarg.in.h
new file mode 100644
index 00000000000..4469d54e4f4
--- /dev/null
+++ b/lib/stdarg.in.h
@@ -0,0 +1,36 @@
+/* Substitute for and wrapper around <stdarg.h>.
+   Copyright (C) 2008-2011 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   This program 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 a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#ifndef _GL_STDARG_H
+
+#if __GNUC__ >= 3
+@PRAGMA_SYSTEM_HEADER@
+#endif
+@PRAGMA_COLUMNS@
+
+/* The include_next requires a split double-inclusion guard.  */
+#@INCLUDE_NEXT@ @NEXT_STDARG_H@
+
+#ifndef _GL_STDARG_H
+#define _GL_STDARG_H
+
+#ifndef va_copy
+# define va_copy(a,b) ((a) = (b))
+#endif
+
+#endif /* _GL_STDARG_H */
+#endif /* _GL_STDARG_H */