#1 found no coveraged source files in or under directory

[Stefan Sauer]

i've just started ggcov as 'ggcov -r src' and got the
above error. The whole project is compile with coverage
and coverage data is there. In fact I currently build
coverage report using lcov from the test suite runs.
When I start 'ggcov -r tests' it says

/home/ensonic/projects/buzztard/buzztard/tests/m-bt-cmd.c:
WARNING: data files written by a broken gcc 2.96; the
Calls statistics and the contents of the Calls, Call
Butterfly and Call Graph windows will be incomplete.
Skipping object file.

which isn'ttrue. my gcc is $ gcc --version
gcc (GCC) 3.3.3 20040412 (Gentoo Linux 3.3.3-r6,
ssp-3.3.2-2, pie-8.7.6)