Error during parallel make

Summary

The make process fails when parallel compiling is enabled. The error message is this:

mv: cannot stat 'TitanLoggerApi.ttcn_': No such file or directory make[4]: *** [Makefile:280: TitanLoggerApi.ttcn] Error 1

Please visit this URL for more information: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=987646

Steps and/or TTCN-3 code to reproduce

Build Titan without --no-parallel option and the process will fail sometimes.

What is the current bug behavior?

It's not consistent, sometimes the build succeeds, sometimes fails with the error above.

What is the expected correct behavior?

Stable builds without --no-parallel option.

Relevant logs and/or screenshots

mv TitanLoggerApi.ttcn_ TitanLoggerApi.ttcn
mv TitanLoggerApi.ttcn_ TitanLoggerApi.ttcn
mv: cannot stat 'TitanLoggerApi.ttcn_': No such file or directory
make[4]: *** [Makefile:280: TitanLoggerApi.ttcn] Error 1

Possible fixes

N/A

Titan version

All versions involved.

Platform details (OS type and version)

Various x86_64 Debian versions. The bug is platform independent.

/cc @aknappqwt