linux-kernel - Re: [PATCH] scripts/tools-support-relr.sh: un-quote variables

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Message-ID: <20191113054056.GB16066@ubuntu-m2-xlarge-x86>
Date:   Tue, 12 Nov 2019 22:40:56 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Ilie Halip <ilie.halip@...il.com>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] scripts/tools-support-relr.sh: un-quote variables

On Tue, Nov 12, 2019 at 03:45:20PM +0200, Ilie Halip wrote:
> When the CC variable contains quotes, e.g. when using
> ccache (make CC="ccache <compiler>"), this script always
> fails, so CONFIG_RELR is never enabled, even when the
> toolchain supports this feature. Removing the /dev/null
> redirect and invoking the script manually shows the issue:
> 
>     $ CC='/usr/bin/ccache clang' ./scripts/tools-support-relr.sh
>     ./scripts/tools-support-relr.sh: 7: ./scripts/tools-support-relr.sh: /usr/bin/ccache clang: not found
> 
> Fix this by un-quoting the variables.
> 
> Before:
>     $ make ARCH=arm64 CC='/usr/bin/ccache clang' LD=ld.lld \
>         NM=llvm-nm OBJCOPY=llvm-objcopy defconfig
>     $ grep RELR .config
>     CONFIG_ARCH_HAS_RELR=y
> 
> With this change:
>     $ make ARCH=arm64 CC='/usr/bin/ccache clang' LD=ld.lld \
>         NM=llvm-nm OBJCOPY=llvm-objcopy defconfig
>     $ grep RELR .config
>     CONFIG_TOOLS_SUPPORT_RELR=y
>     CONFIG_ARCH_HAS_RELR=y
>     CONFIG_RELR=y
> 
> Fixes: 5cf896fb6be3 ("arm64: Add support for relocating the kernel with RELR relocations")
> Reported-by: Dmitry Golovin <dima@...ovin.in>
> Link: https://github.com/ClangBuiltLinux/linux/issues/769
> Cc: Peter Collingbourne <pcc@...gle.com>
> Signed-off-by: Ilie Halip <ilie.halip@...il.com>

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>