linux-kernel - Re: [PATCH 1/1] Makefile: Pass -warn-stack-size only on LLD

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Date:   Mon, 14 Jun 2021 13:51:32 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Tor Vic <torvic9@...lbox.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        masahiroy@...nel.org,
        "ndesaulniers@...gle.com" <ndesaulniers@...gle.com>,
        keescook@...omium.org
Cc:     "clang-built-linux@...glegroups.com" 
        <clang-built-linux@...glegroups.com>, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH 1/1] Makefile: Pass -warn-stack-size only on LLD < 13.0.0

On 6/13/2021 6:07 AM, 'Tor Vic' via Clang Built Linux wrote:
> Since LLVM commit fc018eb, the '-warn-stack-size' flag has been dropped
> [1], leading to the following error message when building with Clang-13
> and LLD-13:
> 
>      ld.lld: error: -plugin-opt=-: ld.lld: Unknown command line argument
>      '-warn-stack-size=2048'.  Try: 'ld.lld --help'
>      ld.lld: Did you mean '--asan-stack=2048'?
> 
> In the same way as with commit 2398ce80152a ("x86, lto: Pass
> -stack-alignment only on LLD < 13.0.0") , make '-warn-stack-size'
> conditional on LLD < 13.0.0.
> 
> [1] https://reviews.llvm.org/D103928
> 
> Fixes: 24845dcb170e ("Makefile: LTO: have linker check -Wframe-larger-than")
> Cc: stable@...r.kernel.org
> Link: https://github.com/ClangBuiltLinux/linux/issues/1377
> Signed-off-by: Tor Vic <torvic9@...lbox.org>

Reviewed-by: Nathan Chancellor <nathan@...nel.org>

The commit that this fixes went into 5.13-rc4 and our CI builds are 
currently failing without this so it would be nice if it could go into 
5.13 but I understand it is getting late in the cycle and there has 
already been a fixes pull request with a similar fix.

Cheers,
Nathan

> ---
>   Makefile | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/Makefile b/Makefile
> index 144d4f8b7eb3..51a1b6b2c2ab 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -929,11 +929,14 @@ CC_FLAGS_LTO	+= -fvisibility=hidden
>   # Limit inlining across translation units to reduce binary size
>   KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
> 
> -# Check for frame size exceeding threshold during prolog/epilog insertion.
> +# Check for frame size exceeding threshold during prolog/epilog insertion
> +# when using lld < 13.0.0.
>   ifneq ($(CONFIG_FRAME_WARN),0)
> +ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
>   KBUILD_LDFLAGS	+= -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
>   endif
>   endif
> +endif
> 
>   ifdef CONFIG_LTO
>   KBUILD_CFLAGS	+= -fno-lto $(CC_FLAGS_LTO)
>