Re: Having problems generating a code coverage report

Peter Geoghegan <pg(at)bowt(dot)ie> writes:
> On Wed, Oct 30, 2024 at 5:26 PM Peter Geoghegan <pg(at)bowt(dot)ie> wrote:
>> I've also been unable to generate coverage reports for some time (at
>> least on Debian, with LCOV version 2.0-1).

> I found a temporary workaround. I'm now once again able to produce
> html coverage reports on my Debian unstable workstation.

I got around to poking at this on a shiny new Fedora 41 image,
with gcc-14.2.1 and lcov-2.0-4. I see errors and warnings aplenty
there too, but after reading the suppression hints that appear in
the error messages I was able to make them all go away:

$ make -s coverage-html GENHTML_FLAGS="-q --legend --ignore-errors unmapped,unmapped"
Overall coverage rate:
lines......: 60.7% (282865 of 466310 lines)
functions......: 67.4% (16114 of 23895 functions)
$

The "-q --legend" part is our default value of GENHTML_FLAGS,
the new magic is the --ignore-errors bit. As far as I can tell,
specifying "unmapped" once reduces that class of errors to
warnings and specifying it again silences them entirely.

With this, I got plausible-looking html output (I didn't vet it
in detail, but a couple of spot checks looked sane).

I'm curious whether a similar workaround will help with the
Debian toolchain.

regards, tom lane