Currently, the build data is stored globally when using the default rcfile, and when using a manually-specified rcfile, it is stored in the same directory as the rcfile. This generally works.
But if you have two rcfiles that live in the same directory, they
inappropriately share build data, because each one stomps on the build
date file generated by the other one. You can manually specify
persistent-data-file in your config file to fix this, but that may be
forgotten, not known about, or unwanted.
This commit fixes that by appending the name of the manually-specified
rcfile to the build data file when not using persistent-data-file in
the config file. This automatically sassociated each manually-specified
rcfile with its own private store of build data, even when it lives in
the same directory as another rcfile.
There is no change when using the default global rcfile behavior.
Fixes #117 (closed)