linux-kernel - Re: [PATCH 2/2] objtool: use host flags to detect if libelf is missing

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Message-ID: <20180223163417.jdj54q6uy2sefcfh@treble>
Date:   Fri, 23 Feb 2018 10:34:17 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Robin Jarry <robin.jarry@...nd.com>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 2/2] objtool: use host flags to detect if libelf is
 missing

On Fri, Feb 23, 2018 at 05:22:55PM +0100, Robin Jarry wrote:
> 2018-02-23, Josh Poimboeuf:
> > Hi Robin,
> > 
> > Did you test this?  I see some issues:
> > 
> > a) I don't see where the host_cflags variable comes from (and btw, it's
> >    misspelled...)
> 
> Hi Josh,
> 
> Shame on me... Last minute fix. I had tested this first by forcing
> HOSTCC="gcc <CFLAGS> <LDFLAGS>" but I found it rather dirty. As it turns
> out, my patch is not better.
> 
> > b) I don't see where objtool uses HOSTLDFLAGS.
> 
> Indeed, I also missed this (see above).
> 
> It looks like objtool does not use HOSTCFLAGS nor HOSTLDFLAGS (defined
> in top Makefile). Do you see a reason why? Maybe it would be a good idea
> to share these flags (adding some specific ones for objtool, if needed).
> 
> What do you think?

Yeah, I think it would be a good idea for objtool to use HOSTCC,
HOSTCFLAGS, and HOSTLDFLAGS.

-- 
Josh