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

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Date:	Wed, 15 Jan 2014 14:48:11 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Michal Marek <mmarek@...e.cz>, LKML <linux-kernel@...r.kernel.org>
Cc:	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] scripts/gcc-version.sh: handle CC="gcc -m32"

Michal Marek <mmarek@...e.cz> writes:
> On 3.1.2014 18:10, Michal Marek wrote:
>> 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?
>
> BTW, what is the usecase for CC="gcc -m32"? AFAICS, at least x86 and
> powerpc do this for you when building a 32bit kernel.

No, without -m32 I get:

$ make
make[1]: Nothing to be done for `all'.
make[1]: Nothing to be done for `relocs'.
  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  CC      kernel/bounds.s
gcc: warning: ‘-mcpu=’ is deprecated; use ‘-mtune=’ or ‘-march=’ instead
gcc: warning: ‘-mcpu=’ is deprecated; use ‘-mtune=’ or ‘-march=’ instead
kernel/bounds.c:1:0: error: CPU you selected does not support x86-64 instruction set
 /*
 ^
kernel/bounds.c:1:0: warning: -mregparm is ignored in 64-bit mode [enabled by default]
make[1]: *** [kernel/bounds.s] Error 1
make: *** [prepare0] Error 2

If that's *supposed* to work, then the bug is elsewhere.

Cheers,
Rusty.
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