linux-kernel - Re: [BUG] perf cross-compile error dual to fixdep not host-exe

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Message-ID: <56162328.1030502@huawei.com>
Date:	Thu, 8 Oct 2015 16:02:48 +0800
From:	He Kuang <hekuang@...wei.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	<jolsa@...nel.org>, David Ahern <dsahern@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Arnaldo Carvalho de Melo" <acme@...hat.com>,
	<linux-kernel@...r.kernel.org>, Wang Nan <wangnan0@...wei.com>
Subject: Re: [BUG] perf cross-compile error dual to fixdep not host-exe

hi, Jirka

On 2015/9/30 14:13, Jiri Olsa wrote:
> On Wed, Sep 30, 2015 at 11:18:20AM +0800, He Kuang wrote:
>> Hi,
>>
>> perf cross-compile error dual to fixdep is not a host executable, first bad commit
>> is 7c422f557266("tools build: Build fixdep helper from perf and basic libs")
>>
>> Cross-compiling an aarch64 target on x86_64 host, error like this:
>>
>>    $ make ARCH=aarch64 O=xx/aarch64 CROSS_COMPILE=aarch64-linux-gnu
>>    ...
>>    make[3]: *** [xx/aarch64/parse-utils.o] Error 126
>>    make[3]: *** Waiting for unfinished jobs....
>>    /bin/sh: xx/aarch64//fixdep: cannot execute binary file
>>
>>    $ uname -a
>>    x86_64 x86_64 x86_64 GNU/Linux
>>
>>    $ file xx/aarch64//fixdep
>>    xx/aarch64//fixdep : ELF 64-bit LSB executable, ARM aarch64, version 1
>>    (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, for
>>    GNU/Linux 3.7.0, not stripped
>
> hum, we need fixdep to stay the host arch.. I should have seen it :-\
> could you please check attached patch?
>
> thanks,
> jirka
>

It does not work, 'fixdep' still be compiled as target executable.

Thank you.

>
> ---
> diff --git a/tools/build/Makefile b/tools/build/Makefile
> index a93036272d43..648897694992 100644
> --- a/tools/build/Makefile
> +++ b/tools/build/Makefile
> @@ -5,15 +5,6 @@ endif
>
>   include $(srctree)/tools//scripts/Makefile.include
>
> -define allow-override
> -  $(if $(or $(findstring environment,$(origin $(1))),\
> -            $(findstring command line,$(origin $(1)))),,\
> -    $(eval $(1) = $(2)))
> -endef
> -
> -$(call allow-override,CC,$(CROSS_COMPILE)gcc)
> -$(call allow-override,LD,$(CROSS_COMPILE)ld)
> -
>   ifeq ($(V),1)
>     Q =
>   else
>

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