linux-kernel - Re: [PATCH] scripts/gcc-version.sh: handle CC="gcc -m32"

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Date:	Fri, 03 Jan 2014 18:10:52 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	Rusty Russell <rusty@...tcorp.com.au>,
	LKML <linux-kernel@...r.kernel.org>
CC:	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] scripts/gcc-version.sh: handle CC="gcc -m32"

On 2013-12-10 08:13, Rusty Russell wrote:
> Without it we get ugly warnings (though build still succeeds).
> 
> $ make -j8 CC="gcc -m32"
> In file included from <command-line>:0:0:
> /usr/include/stdc-predef.h:30:26: fatal error: bits/predefs.h: No such file or directory
>  #include <bits/predefs.h>
>                           ^
> compilation terminated.
> In file included from <command-line>:0:0:
> /usr/include/stdc-predef.h:30:26: fatal error: bits/predefs.h: No such file or directory
>  #include <bits/predefs.h>
>                           ^
> compilation terminated.
> /home/rusty/devel/kernel/linux/scripts/gcc-version.sh: line 31: printf: #: invalid number
> /home/rusty/devel/kernel/linux/scripts/gcc-version.sh: line 31: printf: #: invalid number
> /bin/sh: 1: [: 0001: unexpected operator
>   CHK     include/config/kernel.release
>   CHK     include/generated/uapi/linux/version.h
> make[1]: Nothing to be done for `all'.
> ...
> 
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> 
> diff --git a/scripts/gcc-version.sh b/scripts/gcc-version.sh
> index 7f2126df91f2..d48b0cbaf246 100644
> --- a/scripts/gcc-version.sh
> +++ b/scripts/gcc-version.sh
> @@ -14,7 +14,7 @@ if [ "$1" = "-p" ] ; then
>  	shift;
>  fi
>  
> -compiler="$*"
> +compiler="$1"

But this will break things like CC="ccache gcc". Your problem is that
you do not have the 32bit glibc headers, right? How about invoking the
compiler with $NOSTDINC_FLAGS, so that it does not depend on any
userspace stuff?

Thanks,
Michal
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