GNU bug report logs - #63517
Fixing lcov usage?

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Ludovic Courtès <ludovic.courtes <at> inria.fr>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#63517: closed (Fixing lcov usage?)
Date: Mon, 22 May 2023 15:30:02 +0000

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Your message dated Mon, 22 May 2023 17:29:19 +0200
with message-id <874jo4wfjk.fsf <at> gnu.org>
and subject line Re: bug#63517: Fixing lcov usage?
has caused the debbugs.gnu.org bug report #63517,
regarding Fixing lcov usage?
to be marked as done.

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63517: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=63517
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From: Luca Cirrottola <luca.cirrottola <at> inria.fr>
To: guix-patches <at> gnu.org
Subject: Fixing lcov usage?
Date: Mon, 15 May 2023 14:10:41 +0200 (CEST)

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Hello, 
I want use lcov to generate a coverage report for a C program, but I find out I always need to add "findutils" package to my shell in order for "lcov" to work. Shouldn't "findutils" be added to the propagated-inputs of "lcov", to have it available at runtime? 

Here is a short description of the problem which can be tested on the attached (empty) C program "main.c". 

1. The shell I want to use: 

guix shell -C gcc-toolchain lcov 

2. The commands I run in the shell: 

gcc -fprofile-arcs -ftest-coverage -g -O0 -c main.c 
gcc -fprofile-arcs -ftest-coverage -g -O0 -lgcov main.o -o my_program 
./my_program 
lcov --directory . --capture --output-file coverage.info 

3. The problem I get: lcov is unable to find the .gcda files for its coverage report (message ".geninfo-real: WARNING: no .gcda files found in . - skipping!"). 

Everything works fine with "guix shell -C gcc-toolchain lcov findutils", or if I add "findutils" to the propagated-inputs of "lcov" as in the proposed patch (for the commit 13e252af79ffb85bc68d8104fdf700269b903875 on master), which I have tested by defining and building the modified package in a local copy of the gnu/packages/code.scm module. 

Of coarse I am open to recognize my errors if I have missed something in the package usage :-) or if I have misunderstood the usage of propagated-inputs (but it didn't work with findutils as "normal" input)... or if there are better solutions. 

Thank you in advance, 
Luca 

-- 
Luca CIRROTTOLA 
Research software engineer @ INRIA - research center of the university of Bordeaux and Pau 
Personal webpage: [ https://lcirrottola.github.io/ | https://lcirrottola.github.io/ ] 
Tel: +33 5 2 4 57 41 21 
200 Avenue de la Vieille Tour 
33405 Talence cedex 
France 

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From: Ludovic Courtès <ludovic.courtes <at> inria.fr>
To: Luca Cirrottola <luca.cirrottola <at> inria.fr>
Cc: 63517-done <at> debbugs.gnu.org
Subject: Re: bug#63517: Fixing lcov usage?
Date: Mon, 22 May 2023 17:29:19 +0200

Hi Luca,

Luca Cirrottola <luca.cirrottola <at> inria.fr> skribis:

> I want use lcov to generate a coverage report for a C program, but I find out I always need to add "findutils" package to my shell in order for "lcov" to work. Shouldn't "findutils" be added to the propagated-inputs of "lcov", to have it available at runtime? 

I took a slightly less intrusive approach:

  https://git.savannah.gnu.org/cgit/guix.git/commit/?id=88a2871d8f82a7280486c2a30cc9b510ee8b2b5c

Thanks for the bug report & proposal!

Ludo’.

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