linux-kernel - Re: [PATCH v3 3/4] MIPS: VDSO: Use $(LD) instead of $(CC) to link VDSO

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Message-ID: <20200427232406.GA8226@ubuntu-s3-xlarge-x86>
Date:   Mon, 27 Apr 2020 16:24:06 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     "Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com, linux-kbuild@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Dmitry Golovin <dima@...ovin.in>,
        Sedat Dilek <sedat.dilek@...il.com>
Subject: Re: [PATCH v3 3/4] MIPS: VDSO: Use $(LD) instead of $(CC) to link
 VDSO

On Mon, Apr 27, 2020 at 05:22:53PM +0100, Maciej W. Rozycki wrote:
> On Sun, 26 Apr 2020, Nathan Chancellor wrote:
> 
> > > this causes build errors for me when (cross) compiling a big endian target:
> > > 
> > > target is little endian
> > > mips64-linux-gnu-ld: arch/mips/vdso/elf.o: endianness incompatible with that of the selected emulation
> > > mips64-linux-gnu-ld: failed to merge target specific data of file arch/mips/vdso/elf.o
> > 
> > Thanks for the report. I will look into it tomorrow and hopefully have a
> > v4 by then.
> 
>  Can you actually record in the change description what the difference in 
> the relevant link command is, as shown where `V=1' has been used with 
> `make' invocation?

That will be rather unweildy to put in the commit message since
currently, $(CC) + $(KBUILD_CFLAGS) is being used but I can if it is
really desired. Otherwise, I can just put it where I put the changelog.

>  Actually running `diff -bu' on the whole `V=1' build log obtained without 
> and with your proposed change applied and ensuring there are no unwanted 
> changes elsewhere will be a good measure of the correctness of your patch. 
> You may have to prepare to be patient and run with `-j1' to make sure any 
> `make' parallelism does not interfere with the order of commands printed.
> 
>   Maciej
> 

Thanks for the input, I will take a look.

Cheers,
Nathan