linux-kernel - Re: [PATCH v3] selftests: kvm: Fix libkvm build error

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Date:   Thu, 3 Oct 2019 12:00:43 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Shuah Khan <skhan@...uxfoundation.org>, rkrcmar@...hat.com,
        shuah@...nel.org
Cc:     kvm@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] selftests: kvm: Fix libkvm build error

On 03/10/19 01:14, Shuah Khan wrote:
> Fix the following build error from "make TARGETS=kvm kselftest":
> 
> libkvm.a(assert.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a PIE object; recompile with -fPIC
> 
> This error is seen when build is done from the main Makefile using
> kselftest target. In this case KBUILD_CPPFLAGS and CC_OPTION_CFLAGS
> are defined.
> 
> When build is invoked using:
> 
> "make -C tools/testing/selftests/kvm" KBUILD_CPPFLAGS and CC_OPTION_CFLAGS
> aren't defined.
> 
> There is no need to pass in KBUILD_CPPFLAGS and CC_OPTION_CFLAGS for the
> check to determine if --no-pie is necessary, which is the case when these
> two aren't defined when "make -C tools/testing/selftests/kvm" runs.
> 
> Fix it by simplifying the no-pie-option logic. With this change, both
> build variations work.
> 
> "make TARGETS=kvm kselftest"
> "make -C tools/testing/selftests/kvm"
> 
> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
> ---
> Changes since v2:
> -- Removed extra blank line added by accident.
> -- Fixed commit log.
> 
>  tools/testing/selftests/kvm/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index 62c591f87dab..7ee097658ef0 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -48,7 +48,7 @@ CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \
>  	-I$(LINUX_HDR_PATH) -Iinclude -I$(<D) -Iinclude/$(UNAME_M) -I..
>  
>  no-pie-option := $(call try-run, echo 'int main() { return 0; }' | \
> -        $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -no-pie -x c - -o "$$TMP", -no-pie)
> +        $(CC) -Werror -no-pie -x c - -o "$$TMP", -no-pie)
>  
>  # On s390, build the testcases KVM-enabled
>  pgste-option = $(call try-run, echo 'int main() { return 0; }' | \
> 

Queued, thanks.

Paolo