Feedback-ID: i0fe9450f:Fastmail
Date: Thu, 22 Jan 2026 09:48:35 +0900
From: Michael Paquier <michael@paquier.xyz>
To: Andres Freund <andres@anarazel.de>
Cc: Aleksander Alekseev <aleksander@timescale.com>,
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
	jian he <jian.universality@gmail.com>, Peter Geoghegan <pg@bowt.ie>
Subject: Re: Having problems generating a code coverage report
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On Wed, Jan 21, 2026 at 01:57:58PM -0500, Andres Freund wrote:
> I just encountered this. The problem seems to only happen when the build
> directory is inside the source directory.
>=20
> Not that that's a great solution, but just having the build dir be in a
> separate directory fixed the issue for me.

Even with a VPATH build on Debien GID?  FWIW, I am unable to run a
coverage-html even in this case from the root of a build, finishing
with stuff like that:
/usr/bin/lcov --gcov-tool /usr/bin/gcov -q --no-external -c -i -d . -d
/home/user/git/postgres/ -o lcov_base.info
lcov: ERROR: (empty) no .gcno files found in /home/user/git/postgres
(use "lcov --ignore-errors empty ..." to bypass this error)

Passing "--ignore-errors empty" to LCOVFLAGS bypasses the first step
but genhtml complains, like:
genhtml: ERROR: (corrupt) unable to read trace file 'lcov_base.info':

meson is no better as far as I've tried, so I have pretty much given
up with coverage reports in this environment at this stage.  If there
is a magic recipe, I am not really aware of one..
--
Michael

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