[LTP] Questions about gcov/lcov and Fortran 90

[LTP] Questions about gcov/lcov and Fortran 90

[Christophe Taillan]

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Hi everyone,

I am currently using gcov/lcov to study coverage of a large Fortran 90
code. The goal is to find and erase unused code.
Due to the size of the program, I'm looking for a way to automatize the
process.

But I've got some trouble :
   -  with nested "if": if the main condition is not validated, all the
code in the "if" block should be tagged as "####", in fact, it seems that
other "if" lines are not...
   -  lines read once seems not to be tagged as "1",
   -  lines like "use some_module" are not tagged either.

So my question is, is there any existing tools to manage with these
problems or did I miss any option in gcov?

Thank to all of you,

Christophe

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Re: [LTP] Questions about gcov/lcov and Fortran 90

[Peter Oberparleiter]

On 14.09.2014 14:27, Christophe Taillan wrote:
> I am currently using gcov/lcov to study coverage of a large Fortran 90
> code. The goal is to find and erase unused code.
> Due to the size of the program, I'm looking for a way to automatize the
> process.
> 
> But I've got some trouble :
>    -  with nested "if": if the main condition is not validated, all the
> code in the "if" block should be tagged as "####", in fact, it seems
> that other "if" lines are not... 
>    -  lines read once seems not to be tagged as "1",
>    -  lines like "use some_module" are not tagged either.
> 
> So my question is, is there any existing tools to manage with these
> problems or did I miss any option in gcov?

gcov can only report coverage data for lines for which GCC generated
actual code. While I don't have any experience with Fortran 90, my guess
would be that "use some_module" does not actually generate code.

Also turning off all optimization options when compiling the code in
question can help improve the accuracy of gcov/lcov. See also:

https://gcc.gnu.org/onlinedocs/gcc/Gcov-Intro.html


Regards,
  Peter Oberparleiter

-- 
Peter Oberparleiter
Linux on System z Development - IBM Germany


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