This might be difficult to get for the whole browser, but we can definitely get a shell build.

I could take this.

I have this working.

I'd like to resurrect this. I'm assuming the work here is something like adding gcov to CFLAGS? If not: - Is there a patch to make this work? - Is this in the build system somewhere? - Have we automated tracking/testing/arewecoveredyet.com for this? - if so, where do the numbers go? - if so, were problems like the ones reported in bug 635155 and bug 621096 detected or detectable?

We have existing weekly whole-browser code coverage builds, they're apparently failing to compile right now (in JS, conveniently enough): http://tinderbox.mozilla.org/showlog.cgi?log=Testing/1299323050.1299324259.9880.gz I'd have to poke to find out where the results were, but we were producing lcov output from having run all the unittest suites.

The builds are successful and producing output now, but they're timing out running "make check" / xpcshell-tests, I filed bug 657631 on that. The output isn't really going anywhere useful at the moment, there's a .tar.bz2 here with the lcov output: http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/experimental/codecoverage/

See also bug 657639.

Looks like code coverage is currently tracked in bug 1301170.

We are currently running the coverage buily daily. You can see a report of the coverage at https://codecov.io/gh/marco-c/gecko-dev.