[PATCH] gdb: fix sparc memcpy fortify error

[Mike Frysinger <vapier@gentoo.org>]

Building on an x86_64-linux system with --enable-targets=all fails on the
sparc code with a fortify error:

cc1: warnings being treated as errors
In file included from /usr/include/string.h:640,
                 from gnulib/string.h:23,
                 from ../../gdb/gdb_string.h:25,
                 from ../../gdb/vec.h:25,
                 from ../../gdb/memattr.h:24,
                 from ../../gdb/target.h:60,
                 from ../../gdb/exec.h:23,
                 from ../../gdb/gdbcore.h:31,
                 from ../../gdb/sparc-tdep.c:29:
In function 'memcpy',
    inlined from 'sparc32_store_return_value' at ../../gdb/sparc-tdep.c:1112,
    inlined from 'sparc32_return_value' at ../../gdb/sparc-tdep.c:1170:
/usr/include/bits/string3.h:52: error: call to __builtin___memcpy_chk will
	always overflow destination buffer
make: *** [sparc-tdep.o] Error 1

So have the buffer be the max of the lengths used with memcpy().

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
2010-03-18  Mike Frysinger  <vapier@gentoo.org>

	* gdb/sparc-tdep.c (sparc32_store_return_value): Declare the length
	of buf using the "len" variable.

 gdb/sparc-tdep.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/gdb/sparc-tdep.c b/gdb/sparc-tdep.c
index f129a55..ea0cdd2 100644
--- a/gdb/sparc-tdep.c
+++ b/gdb/sparc-tdep.c
@@ -1101,7 +1101,7 @@ sparc32_store_return_value (struct type *type, struct regcache *regcache,
 			    const gdb_byte *valbuf)
 {
   int len = TYPE_LENGTH (type);
-  gdb_byte buf[8];
+  gdb_byte buf[max(len, 8)];
 
   gdb_assert (!sparc_structure_or_union_p (type));
   gdb_assert (!(sparc_floating_p (type) && len == 16));
-- 
1.7.0.2