Re: [PATCH net] selftests: net/{lib,openvswitch}: extend CFLAGS to keep options from environment

[Matthieu Baerts <matttbe@kernel.org>]

Hi Jan,

On 23/01/2025 13:38, Jan Stancek wrote:
> Package build environments like Fedora rpmbuild introduced hardening
> options (e.g. -pie -Wl,-z,now) by passing a -spec option to CFLAGS
> and LDFLAGS.
> 
> Some Makefiles currently override CFLAGS but not LDFLAGS, which leads
> to a mismatch and build failure, for example:
>   /usr/bin/ld: /tmp/ccd2apay.o: relocation R_X86_64_32 against
>     `.rodata.str1.1' can not be used when making a PIE object; recompile with -fPIE
>   /usr/bin/ld: failed to set dynamic section sizes: bad value
>   collect2: error: ld returned 1 exit status
>   make[1]: *** [../../lib.mk:222: tools/testing/selftests/net/lib/csum] Error 1

Thank you for the fix!

> openvswitch/Makefile CFLAGS currently do not appear to be used, but
> fix it anyway for the case when new tests are introduced in future.
> 
> Fixes: 1d0dc857b5d8 ("selftests: drv-net: add checksum tests")

Note that this commit is only for the Makefile in 'lib', not in
'openvswitch', but I guess there is no need to backport that all along.
Maybe the two modifications should be split, but I guess that's fine here.

> Signed-off-by: Jan Stancek <jstancek@redhat.com>
> ---
>  tools/testing/selftests/net/lib/Makefile         | 2 +-
>  tools/testing/selftests/net/openvswitch/Makefile | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/net/lib/Makefile b/tools/testing/selftests/net/lib/Makefile
> index 18b9443454a9..578de40cc5e3 100644
> --- a/tools/testing/selftests/net/lib/Makefile
> +++ b/tools/testing/selftests/net/lib/Makefile
> @@ -1,6 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0
>  
> -CFLAGS =  -Wall -Wl,--no-as-needed -O2 -g
> +CFLAGS +=  -Wall -Wl,--no-as-needed -O2 -g

(small detail: I guess the double whitespaces after the '=' were there
to keep the alignment with the next line, so probably there should be
only one now, but I don't think this alone is enough to ask for a v2!)

Apart from that:

Acked-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>

>  CFLAGS += -I../../../../../usr/include/ $(KHDR_INCLUDES)
>  # Additional include paths needed by kselftest.h
>  CFLAGS += -I../../
> diff --git a/tools/testing/selftests/net/openvswitch/Makefile b/tools/testing/selftests/net/openvswitch/Makefile
> index 2f1508abc826..1567a549ba34 100644
> --- a/tools/testing/selftests/net/openvswitch/Makefile
> +++ b/tools/testing/selftests/net/openvswitch/Makefile
> @@ -2,7 +2,7 @@
>  
>  top_srcdir = ../../../../..
>  
> -CFLAGS =  -Wall -Wl,--no-as-needed -O2 -g -I$(top_srcdir)/usr/include $(KHDR_INCLUDES)
> +CFLAGS +=  -Wall -Wl,--no-as-needed -O2 -g -I$(top_srcdir)/usr/include $(KHDR_INCLUDES)
>  
>  TEST_PROGS := openvswitch.sh
>  

Cheers,
Matt
-- 
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