linux-kernel - Re: make clean all broken with -j? + question regarding modpost

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Message-ID: <20170812112126.GB7704@localhost.localdomain>
Date:   Sat, 12 Aug 2017 13:21:26 +0200
From:   Thomas Meyer <thomas@...3r.de>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-kbuild <linux-kbuild@...r.kernel.org>
Subject: Re: make clean all broken with -j? + question regarding modpost

On Sat, Aug 12, 2017 at 12:15:11PM +0900, Masahiro Yamada wrote:
> Hi.
> 
> 2017-08-11 3:28 GMT+09:00 Randy Dunlap <rdunlap@...radead.org>:
> 
> >> 2.) compile modpost with debug symbols, -g
> >> how do I compile the modpost helper program with debug symbols? In what
> >> makefile, kbuild file do I need to add the compiler flag?
> >> Any help would be appreciated!
> 
> 
> If you want to pass extra options to the build command of host-programs,
> HOST_EXTRACFLAGS is supported.
> 
> For example,  HOST_EXTRACFLAGS=-g

Yes, after reading Documentation/kbuild/makefiles.txt and studying the
top level Makefile I was able to figure it out by myself.

But many thanks for the hint!

Now I just need to find out why an UML kernel with CONFIG_GCOV fails to
build all modules. modpost abends with missing symbols
__gcov_init, etc.


with kind regards
thomas
> 
> 
> 
> 
> 
> -- 
> Best Regards
> Masahiro Yamada