linux-kernel - Re: [PATCH v3 2/3] selftests/x86/Makefile: Support per-target $(LIBS) configuration

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Date:   Thu, 13 Jan 2022 23:00:07 +0100
From:   Florian Weimer <fweimer@...hat.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     linux-arch@...r.kernel.org, Linux API <linux-api@...r.kernel.org>,
        linux-x86_64@...r.kernel.org, kernel-hardening@...ts.openwall.com,
        linux-mm@...ck.org, the arch/x86 maintainers <x86@...nel.org>,
        musl@...ts.openwall.com, libc-alpha@...rceware.org,
        linux-kernel@...r.kernel.org, Dave Hansen <dave.hansen@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Andrei Vagin <avagin@...il.com>
Subject: Re: [PATCH v3 2/3] selftests/x86/Makefile: Support per-target
 $(LIBS) configuration

* Andy Lutomirski:

> On 1/5/22 08:03, Florian Weimer wrote:
>> And avoid compiling PCHs by accident.
>> 
>
> The patch seems fine, but I can't make heads or tails of the
> $SUBJECT. Can you help me?

What about this?

selftests/x86/Makefile: Set linked libraries using $(LIBS)

I guess that it's possible to use make features to set this per target
isn't important.

Thanks,
Florian

>> Signed-off-by: Florian Weimer <fweimer@...hat.com>
>> ---
>> v3: Patch split out.
>>   tools/testing/selftests/x86/Makefile | 6 ++++--
>>   1 file changed, 4 insertions(+), 2 deletions(-)
>> diff --git a/tools/testing/selftests/x86/Makefile
>> b/tools/testing/selftests/x86/Makefile
>> index 8a1f62ab3c8e..0993d12f2c38 100644
>> --- a/tools/testing/selftests/x86/Makefile
>> +++ b/tools/testing/selftests/x86/Makefile
>> @@ -72,10 +72,12 @@ all_64: $(BINARIES_64)
>>   EXTRA_CLEAN := $(BINARIES_32) $(BINARIES_64)
>>     $(BINARIES_32): $(OUTPUT)/%_32: %.c helpers.h
>> -	$(CC) -m32 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl -lm
>> +	$(CC) -m32 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $(filter-out %.h, $^) \
>> +		$(or $(LIBS), -lrt -ldl -lm)
>>     $(BINARIES_64): $(OUTPUT)/%_64: %.c helpers.h
>> -	$(CC) -m64 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl
>> +	$(CC) -m64 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $(filter-out %.h, $^) \
>> +		$(or $(LIBS), -lrt -ldl -lm)
>>     # x86_64 users should be encouraged to install 32-bit libraries
>>   ifeq ($(CAN_BUILD_I386)$(CAN_BUILD_X86_64),01)