[ccache] ccache test failures

Forte, Greg Greg.Forte at sig.com
Wed Mar 21 11:41:25 UTC 2018

Thanks, Joel!  I haven't had much time to look at this since my previous post, but I did discover that, for the first failing test (CCACHE_NOHASHDIR in base suite), forcing CCACHE_BASEDIR to a common parent dir for just that test cleared the error.  Still not sure if this is actually a problem with the test or due to some other peculiarity in my environment.  CCACHE_BASEDIR is already turned on for the other failing test, though; I will try looking at that one with CCACHE_DEBUG_HASH when I have some time.

-----Original Message-----
From: joel.rosdahl at gmail.com [mailto:joel.rosdahl at gmail.com] On Behalf Of Joel Rosdahl
Sent: Monday, March 19, 2018 3:57 PM
To: Forte, Greg <Greg.Forte at msx.bala.susq.com>
Cc: ccache at lists.samba.org
Subject: Re: [ccache] ccache test failures

On 16 March 2018 at 12:52, Forte, Greg via ccache <ccache at lists.samba.org> wrote:
> Tried this with and without CCACHE_DIR set and exported - with it, I
> see the same output you showed, including the unset, and the test
> still fails: [...]


What's common between the two tests that fail for you is that you don't get a cache hit for a second compilation in another directory. One way to understand why is to log all data that is hashed by ccache in the two cases and see where it starts to differ. There is a crude way of doing that already: Build ccache with -DCCACHE_DEBUG_HASH and set CCACHE_DEBUG_HASH at runtime. Each ccache invocation will then create a ccache-debug-hash.bin that contains the hashed data, so you could compare the files in the two different directories. Or send them to me (private mail) and I'll have a look.

By the way, here's a sketch of a yet unimplemented feature what would make this kind of debugging easier: https://github.com/ccache/ccache/issues/226

-- Joel


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