[Libreoffice-bugs] [Bug 129632] New: ccache does not get any hits on 'make sc' just after 'make sc.clean'

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=129632

            Bug ID: 129632
           Summary: ccache does not get any hits on 'make sc' just after
                    'make sc.clean'
           Product: LibreOffice
           Version: 6.5.0.0.alpha0+ Master
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: LibreOffice
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: dennisfrancis.in at gmail.com

Description:
After a fresh build of master, and a 'make sc.clean' ccache does not get any
hits on running 'make sc.build'.

$ cat autogen.input
--with-parallelism=2
--disable-skia
--without-junit
--enable-symbols
--without-doxygen
--without-help
--without-myspell-dicts
--enable-assert-always-abort

Steps to Reproduce:
1. Setup ccache if you don't have already.
2. Clear ccache cache if there are any.
3. Start a fresh build of core.git master branch (I am at head
56063d30628ee2497a7c559d7de42d26e9cfc8ae). To save time for the purposes of
reproduction, do 'make build-nocheck'
4. run 'make sc.clean'
5. run 'make sc.build'

Actual Results:
The fifth step 'make sc.build' actually invokes the compiler every time because
of ccache misses. It is pretty obvious due to the long time it takes to finish
this step. 

Expected Results:
The fifth step 'make sc.build' should have finished under a minute. At least
until a few weeks ago, with ccache this step used to finish under a minute.


Reproducible: Always


User Profile Reset: No



Additional Info:
uname -a
Linux dennis-laptop 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u2 (2019-11-11)
x86_64 GNU/Linux

ccache -V
ccache version 3.6

I'm certain that there was no such issue in the master from late November. I'll
try to get debug logs from ccache debug-mode runs, next time I build.

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