linux-kernel - Re: [PATCH] Makefile: Improve compressed debug info support detection

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Message-ID: <20200610233954.GB2941409@rani.riverdale.lan>
Date:   Wed, 10 Jun 2020 19:39:54 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Arvind Sankar <nivedita@...m.mit.edu>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Fangrui Song <maskray@...gle.com>,
        Rong Chen <rong.a.chen@...el.com>,
        kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Makefile: Improve compressed debug info support detection

On Wed, Jun 10, 2020 at 07:30:46PM -0400, Arvind Sankar wrote:
> On Wed, Jun 10, 2020 at 02:27:55PM -0700, Nick Desaulniers wrote:
> 
> No, as-option does invoke the assembler. The problem here is that with
> -Wa, the option is only seen by the assembler, not the gcc driver. So it
> will succeed because the assembler supports it, but it will not test
> whether the gcc driver also supports it.
> 

I think in theory another way to fix it is to just use -Wa even for
CFLAGS, assuming the compiler itself doesn't have to do anything with
the option and it's purely an assembler thing. Then you'd just do the as
and ld tests.