linux-kernel - Re: [PATCH v4 2/9] kbuild: Don't pass LDFLAGS to selftest Makefile

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Date:	Wed, 11 Mar 2015 10:08:08 -0600
From:	Shuah Khan <shuahkh@....samsung.com>
To:	Michael Ellerman <mpe@...erman.id.au>
CC:	linux-kernel@...r.kernel.org, davej@...emonkey.org.uk,
	mmarek@...e.cz, linux-api@...r.kernel.org
Subject: Re: [PATCH v4 2/9] kbuild: Don't pass LDFLAGS to selftest Makefile

On 03/10/2015 10:05 PM, Michael Ellerman wrote:
> The makefile in arch/x86/Makefile.um sets LDFLAGS and exports it, which
> is then propagated to the selftest Makefiles and leads to build errors
> there. The build errors occur because we are passing LDFLAGS to CC, but
> the option set in Makefile.um (-m elf_x86_64) is not understood by CC.
> We could fix that by using -Wl, but that might break the UM build if
> it's actually passing that option to LD directly.
> 
> We don't actually want the LDFLAGS from kbuild in the selftest Makefile,
> so the simplest fix seems to be to clear LDFLAGS before invoking the
> selftest Makefile.
> 
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
> ---
>  Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Makefile b/Makefile
> index 0836e9d628f0..5cef1d4c2ea0 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1085,7 +1085,7 @@ headers_check: headers_install
>  
>  PHONY += kselftest
>  kselftest:
> -	$(Q)$(MAKE) -C tools/testing/selftests MAKEFLAGS="$(filter-out rR,$(MAKEFLAGS))" run_tests
> +	$(Q)$(MAKE) LDFLAGS= -C tools/testing/selftests MAKEFLAGS="$(filter-out rR,$(MAKEFLAGS))" run_tests
>  
>  # ---------------------------------------------------------------------------
>  # Modules
> 

Does this work on x86, powerpc, and other architectures? Do all tests
with and without explicit rules build correctly?

-- Shuah

-- 
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shuahkh@....samsung.com | (970) 217-8978
--
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