linux-kernel - Re: [PATCH 1/2] selftests: fix header dependency for pid

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Message-ID: <20220325152058.rjrfzrojufn5ba2p@wittgenstein>
Date:   Fri, 25 Mar 2022 16:20:58 +0100
From:   Christian Brauner <brauner@...nel.org>
To:     Axel Rasmussen <axelrasmussen@...gle.com>
Cc:     Shuah Khan <shuah@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH 1/2] selftests: fix header dependency for pid_namespace
 selftests

On Thu, Mar 24, 2022 at 03:39:28PM -0700, Axel Rasmussen wrote:
> The way the test target was defined before, when building with clang we
> get a command line like this:
> 
> clang -Wall -Werror -g -I../../../../usr/include/ \
> 	regression_enomem.c ../pidfd/pidfd.h  -o regression_enomem
> 
> This yields an error, because clang thinks we want to produce both a *.o
> file, as well as a precompiled header:
> 
> clang: error: cannot specify -o when generating multiple output files
> 
> gcc, for whatever reason, doesn't exhibit the same behavior which I
> suspect is why the problem wasn't noticed before.
> 
> This can be fixed simply by using the LOCAL_HDRS infrastructure the
> selftests lib.mk provides. It does the right think and marks the target
> as depending on the header (so if the header changes, we rebuild), but
> it filters the header out of the compiler command line, so we don't get
> the error described above.
> 
> Signed-off-by: Axel Rasmussen <axelrasmussen@...gle.com>
> ---

Looks good,
Reviewed-by: Christian Brauner <brauner@...nel.org>