Re: [Qemu-devel] [PATCH] host-pcc: enable building with -m32 or -m64

[Stefan Berger <stefanb@linux.vnet.ibm.com>]

On 05/26/2011 05:24 PM, Andreas Färber wrote:
> Am 26.05.2011 um 22:31 schrieb Stefan Berger:
>
>> On 05/26/2011 04:20 PM, Andreas Färber wrote:
>>> Am 26.05.2011 um 21:00 schrieb Stefan Berger:
>>>
>>>> With the below patch I can build either ppc (-m32) or ppc64 (-m64) 
>>>> versions of Qemu (on a ppc64 host) when passing these compiler 
>>>> flags via 'configure ... --extra-cflags="-m32"'.
>>>
>>> You probably meant "without passing"?
>>>
>>> Nack. Please don't hardcode -mXX in configure, it's -arch ppc vs. 
>>> -arch ppc64 on my host/gcc. What's wrong with passing --extra-cflags?
>>>
>> I posted the following patch today for compiling libcacard with -m32 
>> on a 64 bit machine.
>>
>> http://lists.nongnu.org/archive/html/qemu-devel/2011-05/msg02909.html
>>
>> It adds LDFLAGS. This works fine on x86-64. Then trying this out on 
>> ppc64 with -m32 in extra-cflags I find the following in config-host.mak
>>
>> [...]
>> HELPER_CFLAGS=
>> LDFLAGS=-Wl,--warn-common -g
>> ARLIBS_BEGIN=
>> [...]
>>
>> The -m32 doesn't make it into LDFLAGS. The below patch fixed it for 
>> me following the pattern of x86-64 and i686 a bit further up in the 
>> case statement in configure.
>
> Erm, you did try --extra-ldflags for LDFLAGS, did you? That 
> --extra-cflags doesn't end up there is intentional!
>
No, I didn't. Here's what happened. On x86_64 host I used to be able to 
compile 32bit executables with --extra-cflags="-m32". That stopped 
working when libcacard showed up -- I posted a patch today -- only the 
linking of vscclient in libcacard/ didn't work. The "work-around" before 
the patch was --disable-smartcard. Now taking that same habit of passing 
--extra-cflags="-m32" to the ppc64 machine again didn't work, but was 
broken somewhere else. So this is where this is all coming from.

    Stefan

> Andreas