Trouble sharing cache results when compiling with -isystem instead of -I

My companies build system uses -isystem for including 3rd party libraries
like python, Qt4 and others. Unfortunately, the paths from -isystem are
soft-linked to be relative to the personal build area instead of being
directly referenced.

Is looks like ccache v3.2.1 will not use the CCACHE_BASEDIR option when
considering paths provided by -isystem. Is this intentional, an oversight,
or a bug?

Attached are the logs from compiling a single .o and .so from two parallel
work areas

Thank you,
-Robert Houghton

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