Hi Yao,

On Tue, 14 Jul 2015 10:52:33 +0200, Yao Qi wrote:
> this new test fails on i686 buildbot slaves,
> 
> (gdb) core-file /home/gdb-buildbot-2/fedora-x86-64-2/fedora-i686/build/gdb/testsuite/gdb.arch/i386-biarch-core.core
> "/home/gdb-buildbot-2/fedora-x86-64-2/fedora-i686/build/gdb/testsuite/gdb.arch/i386-biarch-core.core"
> is not a core dump: File format not recognized
> (gdb) FAIL: gdb.arch/i386-biarch-core.exp: core-file

There are two problems:

(1) The testcase did not really test if elf64-i386 is supported by GDB (BFD).
That was OK for a Fedora testcase but I forgot about it when submitting it
upstream.

I haven't really verified if the GNU target is elf64-little but it seems so,
no other one seems suitable from:
	elf32-x86-64
	elf64-big
	elf64-k1om
	elf64-l1om
	elf64-little
	elf64-x86-64
	pei-x86-64


(2) The output of the "core-file" command itself can be arbitrary as the
elf64-i386 file with x86_64 registers is really broken; but that does not
matter much, important is the following test whether core file memory is
readable.
	./configure --enable-64-bit-bfd
	(gdb) core-file /home/jkratoch/redhat/gdb-test-build32-plus64/gdb/testsuite/gdb.arch/i386-biarch-core.core^M
	warning: Couldn't find general-purpose registers in core file.^M
	Failed to read a valid object file image from memory.^M
	warning: Couldn't find general-purpose registers in core file.^M
	#0  <unavailable> in ?? ()^M
	(gdb) FAIL: gdb.arch/i386-biarch-core.exp: core-file
	x/i 0x400078^M
	   0x400078:    hlt    ^M
	(gdb) PASS: gdb.arch/i386-biarch-core.exp: .text is readable

OK for check-in a fix for (1) and (2) in this patch?


Jan