Coverage reports with gccgo and lcov

[Albert Strasheim]

Hello all

You can now generate coverage reports for Go commands and tests using gccgo and lcov!

lcov actually needs a bugfix, which is available in the Fedora package:

https://bugzilla.redhat.com/show_bug.cgi?id=787502

The lcov author should release a fixed version soon:

http://ltp.sourceforge.net/coverage/lcov.php

Steps:

cd ~/myproj

rm -rf go-build* html

TMPDIR=`pwd` GOPATH=`pwd` go test -compiler=gccgo -gccgoflags '--coverage -g -O0' -v -work ./...

lcov --directory go-build* --capture --output-file myproj.info

genhtml -o html -s myproj.info

You can also produce reports understood by the Jenkins Cobertura plugin using gcovr:

https://software.sandia.gov/trac/fast/wiki/gcovr

You might have to tweak one line in gcovr:

output_re = re.compile("[cC]reating [`'](.*)'$")

Make sure you have the latest gccgo and go from tip.

Some example output here:

http://alberts.github.com/

Regards,

Albert

P.S. A few issues to watch out for:

http://code.google.com/p/go/issues/detail?id=1790

http://code.google.com/p/go/issues/detail?id=3246

http://code.google.com/p/go/issues/detail?id=3262