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Re: [Qemu-devel] [PATCH] configure: disallow ccache during compile tests
From: |
John Snow |
Subject: |
Re: [Qemu-devel] [PATCH] configure: disallow ccache during compile tests |
Date: |
Thu, 29 Oct 2015 11:53:17 -0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 10/29/2015 02:17 AM, Markus Armbruster wrote:
> John Snow <address@hidden> writes:
>
>> If the user is using CCACHE during the configuration step,
>> it may interfere with some of the configuration tests,
>> particularly the "Is CCACHE interfering with macro analysis" step,
>> which is a bit of a poetic problem.
>>
>> 1) Disallow CCACHE from reading from the cache during configure,
>> but don't disable it to allow us to see if it causes other problems.
>
> This is confusing. "don't disable it entirely"?
>
We allow it to submit items into the cache, but not to read items from
the cache. This prevents it from picking up cached results to the
compile tests.
I don't disable it entirely (just pass-through to the real compiler
without using ccache at all) because I still want to allow ccache to be
processing things to test for ccache failures -- particularly the ccache
macro check that occurs later.
If I just disable ccache, that later check is meaningless. Setting the
cache to "write only" gives me the best of both worlds.
>> 2) Force off CCACHE_CPP2 during the ccache test to get a deterministic
>> answer over whether or not we need to enable that feature later.
>>
>> Signed-off-by: John Snow <address@hidden>