Обсуждение: [GENERAL] Extension coverage

On Sat, Aug 26, 2017 at 2:59 AM, Gabriel Furstenheim Milerud
<furstenheim@gmail.com> wrote:
> The I built my extension against this postgres server
>
>    $ cd $EXTENSION_SOURCE_DIR
>    $ make install && make installcheck
>
> the extension is built fine and the test run. However, I see no difference
> with a normal installation without the flag.
>
> Then I run the following target
> (https://stackoverflow.com/questions/31417900/how-to-run-coverage-report-on-a-postgres-extension)
>    coverage:
>        lcov --no-external -d .  -c -o lcov.info
>        genhtml --show-details --legend --output-directory=coverage
> --title=PostgreSQL --num-spaces=4 --prefix=./src/ `find . -name lcov.info
> -print`
>
> But it complains that there are no .gcda files
>     geninfo: WARNING: no .gcda files found in . - skipping!
> and it errors.
>    genhtml: ERROR: no valid records found in tracefile ./lcov.info
>
> Is this the way to measure coverage on an extension? Am I missing some step?

This error is a bit weird, what you are showing here has nothing
wrong. I do work with this coverage target and postgres extensions,
and the following steps allow me to generate a text report of coverage
when compiling any extension with a Postgres build having
--enable-coverage:
make install
make installcheck
make coverage
Trying to use coverage-html from an external extension leads to an error:
$ make coverage-html
rm -rf coverage
mkdir coverage
/home/ioltas/extra/bin/genhtml --show-details --legend
--output-directory=coverage --title=PostgreSQL --num-spaces=4
--prefix= `find . -name lcov.info -print`
genhtml: Option prefix requires an argument
Use genhtml --help to get usage information

But this bit is easy enough to fix by enforcing the value of
abs_top_srcdir when running the command "make coverage-html".
--
Michael

On Sat, Aug 26, 2017 at 6:28 PM, Gabriel Furstenheim Milerud
<furstenheim@gmail.com> wrote:
> Not sure I follow. Do you have an example that I could check?
> I have the impression that my problem is that no .gcda files are created. If
> I just run the lcov part:
>     lcov -d . -c -o lcov.info
>
> I get
>    Found gcov version: 5.4.0
>    Scanning . for .gcda files ...
>    geninfo: WARNING: no .gcda files found in . - skipping!
>    Finished .info-file creation
>
> and an empty file lcov.info is created.
>
> Just to check, I've tried running make coverage and make coverage-html on
> the folder of postgres instead of the extension and that works.

There is no need to complicate your Makefile with a custom coverage
target, which is, at least it seems to me, the origin of the problems
you are seeing here. So you could just use the one that Postgres' PGXS
provides. Here is a simple Makefile I have used for coverage testing
with an extension:
https://github.com/michaelpq/pg_plugins/blob/master/decoder_raw/Makefile
If you enforce abs_top_srcdir=$(pwd) with make coverage, or
coverage-html if you want, then both are able to work properly. At
least for me they do.
--
Michael