Fix handling of various compile commands

[bkryza]

Fixes #341

[codecov]

Codecov Report

Attention: Patch coverage is 44.44444% with 15 lines in your changes missing coverage. Please review.

Project coverage is 90.60%. Comparing base (644e4a0) to head (d2a9970).

Files with missing lines	Patch %	Lines
src/common/compilation_database.cc	41.66%	14 Missing ⚠️
src/config/config.cc	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #344      +/-   ##
==========================================
- Coverage   90.69%   90.60%   -0.10%     
==========================================
  Files         136      136              
  Lines       16827    16842      +15     
==========================================
- Hits        15262    15260       -2     
- Misses       1565     1582      +17     

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