Message-ID: <e548fa36-ed26-4ad2-855f-b6d4fd40d2a4@kaltenbrunner.cc>
Date: Sat, 14 Feb 2026 09:04:44 +0100
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Subject: Re: Having problems generating a code coverage report
To: Michael Paquier <michael@paquier.xyz>
Cc: Tom Lane <tgl@sss.pgh.pa.us>,
 Aleksander Alekseev <aleksander@timescale.com>,
 PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
 Peter Geoghegan <pg@bowt.ie>
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From: Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
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On 1/29/25 02:00, Michael Paquier wrote:
> On Wed, Jan 15, 2025 at 07:51:39PM -0500, Peter Geoghegan wrote:
>> I was able to get the lcov git master branch's tip to produce a
>> Postgres coverage report (same compiler version and OS as before).
>> Unfortunately, I had to use an even grottier incantation to get this
>> to work:
>>
>> make -s coverage-html GENHTML_FLAGS="-q --legend --ignore-errors
>> unmapped,unmapped,empty,empty,inconsistent,inconsistent,corrupt,corrupt,range,range"
>> LCOVFLAGS="--ignore-errors
>> empty,empty,negative,negative,inconsistent,inconsistent"
>>
>> (As you can imagine, I came up with this through pure trial and error.)
> 
> Interesting.  These tricks do not seem to work here with a Debian GID
> host, unfortunately.  I'll try to dig a bit more, this is getting very
> annoying :(

hmm this is now also breaking coverage.postgresql.org (after an upgrade 
to the current debian trixie):


make: Leaving directory 
'/home/coverage/pgsrc/pgsql/src/interfaces/ecpg/test'
/usr/bin/lcov --gcov-tool /usr/bin/gcov -q --no-external -c -i -d . -d . 
-o lcov_base.info
lcov: WARNING: (deprecated) RC option 'lcov_branch_coverage' is 
deprecated.  Consider using 'branch_coverage'. instead. 
(Backward-compatible support will be removed in the future.)
         (use "lcov --ignore-errors deprecated,deprecated ..." to 
suppress this warning)
Message summary:
   1 error message:
     usage: 1
   1 warning message:
     deprecated: 1
lcov: ERROR: (usage) duplicate file ./src/fe_utils/astreamer_gzip.gcno 
in both . and .
         (use "lcov --ignore-errors usage ..." to bypass this error)
make: *** [src/Makefile.global:1064: lcov_base.info] Error 1


This seems to be basically the same issue that Andres patch in this 
thread tries to address by removing one of the -d - applying a similar 
hack locally seems to help a bit until we are running into one of the 
other reported issues:

lcov: WARNING: (inconsistent) 
/home/coverage/pgsrc/pgsql/contrib/bloom/blinsert.c:274: unexecuted 
block on non-branch line with non-zero hit count.  Use "geninfo --rc 
geninfo_unexecuted_blocks=1 to set count to zero.
	(use "lcov --ignore-errors inconsistent,inconsistent ..." to suppress 
this warning)
lcov: ERROR: (negative) Unexpected negative hit count '-5' for line 
/home/coverage/pgsrc/pgsql/src/port/snprintf.c:529" while capturing from 
./src/port/snprintf_shlib.gcda.
	(use "lcov --ignore-errors negative ..." to bypass this error)
Message summary:
   1 error message:
     negative: 1
   2 warning messages:
     deprecated: 1
     inconsistent: 1
make: *** [src/Makefile.global:1069: lcov_test.info] Error 1


While I certainly can try to locally hack around that further to get it 
build it feels wrong to post process/patch our own tree to get 
"official" coverage reporting...


Stefan