linux-kernel - Re: [PATCH 2/4] selftests: Fix seccomp to support relocatable build (O=objdir)

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Date:   Wed, 4 Mar 2020 14:42:38 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     shuah@...nel.org, luto@...capital.net, wad@...omium.org,
        daniel@...earbox.net, kafai@...com, yhs@...com, andriin@...com,
        gregkh@...uxfoundation.org, tglx@...utronix.de,
        khilman@...libre.com, mpe@...erman.id.au,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH 2/4] selftests: Fix seccomp to support relocatable build
 (O=objdir)

On Wed, Mar 04, 2020 at 03:13:33PM -0700, Shuah Khan wrote:
> Fix seccomp relocatable builds. This is a simple fix to use the
> right lib.mk variable TEST_GEN_PROGS for objects to leverage
> lib.mk common framework for relocatable builds.
> 
> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
> ---
>  tools/testing/selftests/seccomp/Makefile | 16 +++-------------
>  1 file changed, 3 insertions(+), 13 deletions(-)
> 
> diff --git a/tools/testing/selftests/seccomp/Makefile b/tools/testing/selftests/seccomp/Makefile
> index 1760b3e39730..a8a9717fc1be 100644
> --- a/tools/testing/selftests/seccomp/Makefile
> +++ b/tools/testing/selftests/seccomp/Makefile
> @@ -1,17 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0
> -all:
> -
> -include ../lib.mk
> -
> -.PHONY: all clean
> -
> -BINARIES := seccomp_bpf seccomp_benchmark
>  CFLAGS += -Wl,-no-as-needed -Wall
> +LDFLAGS += -lpthread
>  
> -seccomp_bpf: seccomp_bpf.c ../kselftest_harness.h

How is the ../kselftest_harness.h dependency detected in the resulting
build rules?

Otherwise, looks good.

-Kees

> -	$(CC) $(CFLAGS) $(LDFLAGS) $< -lpthread -o $@
> -
> -TEST_PROGS += $(BINARIES)
> -EXTRA_CLEAN := $(BINARIES)
> +TEST_GEN_PROGS := seccomp_bpf seccomp_benchmark
>  
> -all: $(BINARIES)
> +include ../lib.mk
> -- 
> 2.20.1
> 

-- 
Kees Cook