Add code coverage analysis
Description
Add C code coverage analysis using gcov, lcov, and the AX_CODE_COVERAGE autoconf macro.
API Changes and Justification
We aren't yet measuring code coverage, but we ought to. I'm working on a bug fix for some of my own code in LALSuite, and it's crucial that the particular code that I am working on has code coverage measurement. I thought I'd be a good citizen and implement code coverage analysis in GitLab CI for all of LALSuite.
Note that after merging, someone such as @adam-mercer or @duncanmmacleod should add a coverage badge to the GitLab project that links to the HTML coverage report in GitLab Pages.
Backwards Compatible Changes
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This change introduces no API changes -
This change adds new API calls
Backwards Incompatible Changes
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This change modifies an existing API -
This change removes an existing API
Review Status
N/A.