linux-kernel - Re: [PATCH 1/2] selftests/openat2: fix clang build failures: -static-libasan, LOCAL

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Date: Fri, 10 May 2024 10:56:25 -0700
From: John Hubbard <jhubbard@...dia.com>
To: Ryan Roberts <ryan.roberts@....com>, Shuah Khan <shuah@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
 Christian Brauner <brauner@...nel.org>,
 Muhammad Usama Anjum <usama.anjum@...labora.com>,
 Alexey Gladkov <legion@...nel.org>, Valentin Obst <kernel@...entinobst.de>,
 linux-kselftest@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
 llvm@...ts.linux.dev
Subject: Re: [PATCH 1/2] selftests/openat2: fix clang build failures:
 -static-libasan, LOCAL_HDRS

On 5/10/24 4:52 AM, Ryan Roberts wrote:
> On 04/05/2024 05:43, John Hubbard wrote:
..
> It just occured to me that the bug report I was fixing with my attempt was
> invoking make like this (see [1]):
> 
> # tools/testing/selftests/fchmodat2$ make CC=clang
> # tools/testing/selftests/openat2$ make CC=clang
> 
> So LLVM is not set in this case. Perhaps my approach [2] (suggested by Arnd) of
> using cc-option is more robust? (cc-option is alredy used by other selftests).
> 

Yes, I think that would better handle the two cases: setting LLVM,
and/or setting CC (!).

For that, some nits, but only worth fussing over if the patch hasn't
gone in yet, or if you're changing it for some other reason:

In Make, the arguments to functions include *all* spaces, so it's good
practice to not add spaces in most function calls, unless they are
definitely desired.

Also, you only ever want one of those $(CC) options, so saying so is a
nice touch. Neither of these is a functional issue in [2], but you could
do this on top of the patch (I'm only showing the openat2 case):

diff --git a/tools/testing/selftests/openat2/Makefile 
b/tools/testing/selftests/openat2/Makefile
index 02af9b6ca5eb..c894778874a5 100644
--- a/tools/testing/selftests/openat2/Makefile
+++ b/tools/testing/selftests/openat2/Makefile
@@ -3,7 +3,7 @@
  include ../../../build/Build.include

  CFLAGS += -Wall -O2 -g -fsanitize=address -fsanitize=undefined
-CFLAGS += $(call cc-option, -static-libasan) $(call cc-option, 
-static-libsan)
+CFLAGS += $(call cc-option,-static-libasan,$(call 
cc-option,-static-libsan))
  TEST_GEN_PROGS := openat2_test resolve_test rename_attack_test

  include ../lib.mk


> 
> [1] https://lore.kernel.org/all/202404141807.LgsqXPY5-lkp@intel.com/
> [2]
> https://lore.kernel.org/linux-kselftest/20240417160740.2019530-1-ryan.roberts@arm.com/
> 
> 
>> +
>> +LOCAL_HDRS += helpers.h
>> +
>>   include ../lib.mk
>>   
>> -$(TEST_GEN_PROGS): helpers.c helpers.h
>> +$(TEST_GEN_PROGS): helpers.c
>>
>> base-commit: ddb4c3f25b7b95df3d6932db0b379d768a6ebdf7
>> prerequisite-patch-id: b901ece2a5b78503e2fb5480f20e304d36a0ea27
> 

thanks,
-- 
John Hubbard
NVIDIA