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Re: [PATCH] tests/vpci: Use $(CC) instead of $(HOSTCC)
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 2 Jun 2025 17:50:40 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 02 Jun 2025 15:50:56 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.06.2025 17:36, Andrew Cooper wrote:
> On 02/06/2025 4:09 pm, Michal Orzel wrote:
>> These tests are supposed to run on target. HOSTCC can be different than
>> CC (when cross-compiling). At the moment, tests installation would put
>> a binary of a wrong format in the destdir.
>>
>> Fixes: e90580f25bd7 ("vpci: introduce basic handlers to trap accesses to the
>> PCI config space")
>> Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
>
> Oh. This didn't explode in GitlabCI because there's no ARM version of
> *-tools-tests-*.
>
> Can we fix that too please, seeing as there is a real ARM board?
>
> Also, I guess we have to finally sort out the CC vs HOSTCC debate.
I think the situation here makes pretty clear that HOSTCC is almost always
wrong to use for tests/. The emulator test harness is special in that it (in
principle) needs a target compiler (CC) and additionally an x86 one (with no
present representation). The present way of (partly) distinguishing the two
by using CC and HOSTCC was assigning wrong meaning to one (perhaps both) of
them. The (or maybe just my) problem is that in the toolchain world it is
build, host, and target which are distinguished. As per Michal's description
my understanding is that HOSTCC is matching "build" there, not "host".
Jan
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