From: Dmitry Safonov <dima@arista.com>
To: "David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Shuah Khan <shuah@kernel.org>
Cc: Dmitry Safonov <dima@arista.com>,
netdev@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org, kernel test robot <lkp@intel.com>,
Dmitry Safonov <0x7f454c46@gmail.com>
Subject: [PATCH] selftests/net/tcp-ao: Use LDLIBS instead of LDFLAGS
Date: Wed, 10 Jan 2024 21:34:10 +0000 [thread overview]
Message-ID: <20240110-tcp_ao-selftests-makefile-v1-1-aa07d043f052@arista.com> (raw)
The rules to link selftests are:
> $(OUTPUT)/%_ipv4: %.c
> $(LINK.c) $^ $(LDLIBS) -o $@
>
> $(OUTPUT)/%_ipv6: %.c
> $(LINK.c) -DIPV6_TEST $^ $(LDLIBS) -o $@
The intel test robot uses only selftest's Makefile, not the top linux
Makefile:
> make W=1 O=/tmp/kselftest -C tools/testing/selftests
So, $(LINK.c) is determined by environment, rather than by kernel
Makefiles. On my machine (as well as other people that ran tcp-ao
selftests) GNU/Make implicit definition does use $(LDFLAGS):
> [dima@Mindolluin ~]$ make -p -f/dev/null | grep '^LINK.c\>'
> make: *** No targets. Stop.
> LINK.c = $(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH)
But, according to build robot report, it's not the case for them.
While I could just avoid using pre-defined $(LINK.c), it's also used by
selftests/lib.mk by default.
Anyways, according to GNU/Make documentation [1], I should have used
$(LDLIBS) instead of $(LDFLAGS) in the first place, so let's just do it:
> LDFLAGS
> Extra flags to give to compilers when they are supposed to invoke
> the linker, ‘ld’, such as -L. Libraries (-lfoo) should be added
> to the LDLIBS variable instead.
> LDLIBS
> Library flags or names given to compilers when they are supposed
> to invoke the linker, ‘ld’. LOADLIBES is a deprecated (but still
> supported) alternative to LDLIBS. Non-library linker flags, such
> as -L, should go in the LDFLAGS variable.
[1]: https://www.gnu.org/software/make/manual/html_node/Implicit-Variables.html
Fixes: cfbab37b3da0 ("selftests/net: Add TCP-AO library")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202401011151.veyYTJzq-lkp@intel.com/
Signed-off-by: Dmitry Safonov <dima@arista.com>
---
tools/testing/selftests/net/tcp_ao/Makefile | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/net/tcp_ao/Makefile b/tools/testing/selftests/net/tcp_ao/Makefile
index 8e60bae67aa9..522d991e310e 100644
--- a/tools/testing/selftests/net/tcp_ao/Makefile
+++ b/tools/testing/selftests/net/tcp_ao/Makefile
@@ -52,5 +52,5 @@ $(OUTPUT)/%_ipv6: %.c
$(OUTPUT)/icmps-accept_ipv4: CFLAGS+= -DTEST_ICMPS_ACCEPT
$(OUTPUT)/icmps-accept_ipv6: CFLAGS+= -DTEST_ICMPS_ACCEPT
-$(OUTPUT)/bench-lookups_ipv4: LDFLAGS+= -lm
-$(OUTPUT)/bench-lookups_ipv6: LDFLAGS+= -lm
+$(OUTPUT)/bench-lookups_ipv4: LDLIBS+= -lm
+$(OUTPUT)/bench-lookups_ipv6: LDLIBS+= -lm
---
base-commit: 8cb47d7cd090a690c1785385b2f3d407d4a53ad0
change-id: 20240110-tcp_ao-selftests-makefile-3dafb1e96df8
Best regards,
--
Dmitry Safonov <dima@arista.com>
next reply other threads:[~2024-01-10 21:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-10 21:34 Dmitry Safonov [this message]
2024-01-11 14:42 ` [PATCH] selftests/net/tcp-ao: Use LDLIBS instead of LDFLAGS Paolo Abeni
2024-01-12 0:40 ` patchwork-bot+netdevbpf
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