[bug#63517] Fixing lcov usage?

[bug#63517] Fixing lcov usage?

[Luca Cirrottola]

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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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int main( int argc, char* argv[] ) {
  return 0;
}

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diff --git a/gnu/packages/code.scm b/gnu/packages/code.scm
index d57954c47c..2b1d221122 100644
--- a/gnu/packages/code.scm
+++ b/gnu/packages/code.scm
@@ -580,6 +580,7 @@ stack traces.")
                  `("PERL5LIB" ":" prefix (,(getenv "PERL5LIB")))))
              #t)))))
     (inputs (list perl perl-io-compress perl-json))
+    (propagated-inputs (list findutils))
     (home-page "https://ltp.sourceforge.net/coverage/lcov.php")
     (synopsis "Code coverage tool that enhances GNU gcov")
     (description "LCOV is an extension of @command{gcov}, a tool part of the

bug#63517: Fixing lcov usage?

[Ludovic Courtès]

Hi Luca,

Luca Cirrottola <luca.cirrottola@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’.

[bug#63517] Fixing lcov usage?

[Luca Cirrottola]

Hello Ludo',
I could have bet there was a more elegant solution :-)
It works like a charm, thanks!

Luca

----- Mail original -----
> De: "Ludovic Courtès" <ludovic.courtes@inria.fr>
> À: "Luca Cirrottola" <luca.cirrottola@inria.fr>
> Cc: 63517-done@debbugs.gnu.org
> Envoyé: Lundi 22 Mai 2023 17:29:19
> Objet: Re: bug#63517: Fixing lcov usage?

> Hi Luca,
> 
> Luca Cirrottola <luca.cirrottola@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’.

-- 
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