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Re: [PATCH] x86/boot: Reinstate -nostdinc for CFLAGS_x86_32


  • To: Anthony PERARD <anthony.perard@xxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Tue, 3 Sep 2024 12:51:28 +0100
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  • Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Tue, 03 Sep 2024 11:51:47 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 03/09/2024 12:20 pm, Anthony PERARD wrote:
> On Tue, Sep 03, 2024 at 11:49:40AM +0100, Andrew Cooper wrote:
>> Most of Xen is build using -nostdinc and a fully specified include path.
>> However, the makefile line:
>>
>>   $(head-bin-objs): XEN_CFLAGS := $(CFLAGS_x86_32) -fpic
>>
>> discards XEN_CFLAGS and replaces them with CFLAGS_x86_32.
>>
>> Reinstate -nostdinc, and add the arch include path to the command line.  This
>> is a latent bug for now, but it breaks properly with subsequent include
>> changes.
>>
>> Fixes: d58a509e01c4 ("build,x86: remove the need for build32.mk")
> I disagree with this. I'm pretty sure I've check that no command line
> have changed.

Fine, I'll drop it.

>
> Also, this commit shows that CFLAGS was only coming from root's
> Config.mk:
>> diff --git a/xen/arch/x86/boot/build32.mk b/xen/arch/x86/boot
>> deleted file mode 100644
>> index e90680cd9f..0000000000
>> --- a/xen/arch/x86/boot/build32.mk
>> +++ /dev/null
>> @@ -1,40 +0,0 @@
>> -override XEN_TARGET_ARCH=x86_32
>> -CFLAGS =
>> -include $(XEN_ROOT)/Config.mk
> So, I'm pretty sure, -nostdinc was never used before. But happy to be
> told that I've come to the wrong conclusion. (We would need to check by
> building with an old version without this commit to be sure.)

-nostdinc was added after the fact.  Which is fine.

But as a consequence of these being unlike the rest of Xen, somehow (and
only on FreeBSD it seems), the regular build of Xen is fine, but
tools/firmware/xen-dir for the shim is subject to -nostdinc in a way
that breaks cmdline.c

> "xen/arch/x86/boot" as it's own sets of CFLAGS, which is annoying and I
> haven't really tried to change that. This is also why XEN_CFLAGS is been
> discarded.

This is necessary.  We're swapping -m64 for -m32 to build these two
objects, and that invalidates a whole bunch of other CFLAGS.

~Andrew



 


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