Re: [Qemu-devel] [PATCH 02/11] pc-bios/s390-ccw: Use correct strip when cross-compiling

["Alex Bennée" <alex.bennee@linaro.org>]

Sergey Fedorov <serge.fdrv@gmail.com> writes:

> On 18/04/16 18:47, Sergey Fedorov wrote:
>> On 18/04/16 18:34, Cornelia Huck wrote:
>>> On Mon, 18 Apr 2016 16:51:16 +0200
>>> Cornelia Huck <cornelia.huck@de.ibm.com> wrote:
>>>
>>>> On Thu,  7 Apr 2016 18:53:44 +0300
>>>> Sergey Fedorov <sergey.fedorov@linaro.org> wrote:
>>>>
>>>>> From: Sergey Fedorov <serge.fdrv@gmail.com>
>>>>>
>>>>> Signed-off-by: Sergey Fedorov <serge.fdrv@gmail.com>
>>>>> Signed-off-by: Sergey Fedorov <sergey.fedorov@linaro.org>
>>>>> ---
>>>>>  pc-bios/s390-ccw/Makefile | 2 +-
>>>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/pc-bios/s390-ccw/Makefile b/pc-bios/s390-ccw/Makefile
>>>>> index 4208cb429593..5ce6d4ccbaf5 100644
>>>>> --- a/pc-bios/s390-ccw/Makefile
>>>>> +++ b/pc-bios/s390-ccw/Makefile
>>>>> @@ -20,7 +20,7 @@ s390-ccw.elf: $(OBJECTS)
>>>>>  	$(call quiet-command,$(CC) $(LDFLAGS) -o $@ $(OBJECTS),"  Building $(TARGET_DIR)$@")
>>>>>
>>>>>  s390-ccw.img: s390-ccw.elf
>>>>> -	$(call quiet-command,strip --strip-unneeded $< -o $@,"  Stripping $(TARGET_DIR)$@")
>>>>> +	$(call quiet-command,$(STRIP) --strip-unneeded $< -o $@,"  Stripping $(TARGET_DIR)$@")
>>>>>
>>>>>  $(OBJECTS): Makefile
>>>>>
>>>> Thanks, applied to s390-next.
>>> Uhm, scratch that.
>>>
>>> This fails to build with --disable-strip, as $STRIP is unset in that
>>> case:
>>>
>>>   Building s390-ccw/s390-ccw.elf
>>>   Stripping s390-ccw/s390-ccw.img
>>> /bin/sh: --strip-unneeded: command not found
>>> make[1]: *** [s390-ccw.img] Error 127
>>>
>>>
>>> The catch is that we always want to strip that binary. Care to send a
>>> patch that deals with that?
>>>
>> I see the problem. I don't promise to fix it soon, but I could try
>> dealing with this as I have time. I don't mind if someone else can just
>> fix it with their own patch :)
>
> It's not straightforward to fix. We need to detect a correct
> cross-prefix for strip. There is something in roms/Makefile:
>
>     #
>     # cross compiler auto detection
>     #
>     path := $(subst :, ,$(PATH))
>     system := $(shell uname -s | tr "A-Z" "a-z")
>
>     # first find cross binutils in path
>     find-cross-ld = $(firstword $(wildcard $(patsubst
>     %,%/$(1)-*$(system)*-ld,$(path))))
>     # then check we have cross gcc too
>     find-cross-gcc = $(firstword $(wildcard $(patsubst %ld,%gcc,$(call
>     find-cross-ld,$(1)))))
>     # finally strip off path + toolname so we get the prefix
>     find-cross-prefix = $(subst gcc,,$(notdir $(call find-cross-gcc,$(1))))
>
>     powerpc64_cross_prefix := $(call find-cross-prefix,powerpc64)
>     powerpc_cross_prefix := $(call find-cross-prefix,powerpc)
>     x86_64_cross_prefix := $(call find-cross-prefix,x86_64)

Ohh that's cool. I wonder if it could be used to solve the tcg/tests
problem?

>
>
> and then:
>
>     $(powerpc_cross_prefix)strip <...>
>
>
> However, to solve this problem, it would be enough to export
> ${cross_prefix} from configure to config-host.mak and do like this:
>
>     $(CROSS_PREFIX)strip <...>
>
>
> Kind regards,
> Sergey


--
Alex Bennée