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List:       ltp-coverage
Subject:    Re: [Ltp-coverage] Some questions about lcov
From:       Peter Oberparleiter <oberpar () linux ! vnet ! ibm ! com>
Date:       2010-05-18 8:15:14
Message-ID: 4BF24C92.6000603 () linux ! vnet ! ibm ! com
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Hi,

On 10.05.2010 17:42, � 敌炸酱面 wrote:
> There are some problems when I'm using lcov.
> I have a project in the attach file. There a WARNING message when i run
> lcov. like this:
> geninfo: WARNING: no data found for
> /home/corper/program/hello/src/../src/hello.cpp
>
> I don't know how to solve it. Please help me.
>
> the whole information is:
>
> corper@corper-desktop:~/program/hello/cov$ lcov -d ../Debug/ -c -b ../src/
[...]

> ../src/hello.cpp:could not open output file '..#src#hello.cpp.gcov'
> geninfo: WARNING: no data found for
> /home/corper/program/hello/src/../src/hello.cpp
> Finished .info-file creation
> Overall coverage rate:
>    lines......: 3.2% (1 of 31 lines)
>    functions..: 0.0% (0 of 11 functions)
>    branches...: 0.0% (0 of 6 branches)

I tried to recreate the problem using the hello.tar.gz file your sent 
but everything works fine (I used the current CVS version of LCOV):

hello/cov> lcov -d ../Debug/ -c -b ../src/ -o test.info
Capturing coverage data from ../Debug/
Found gcov version: 4.1.2
Scanning ../Debug/ for .gcda files ...
Found 1 data files in ../Debug/
Processing hello.gcda
/home/oberpar/tmp/ggg/hello/Debug/src/hello.gcno:version '404*', prefer 
'401p'
/home/oberpar/tmp/ggg/hello/Debug/src/hello.gcda:version '404*', prefer 
version '401p'
/usr/include/c++/4.4/bits/ios_base.h:cannot open source file
/usr/include/c++/4.4/ostream:cannot open source file
/usr/include/c++/4.4/bits/basic_ios.h:cannot open source file
/usr/include/c++/4.4/iostream:cannot open source file
/usr/include/c++/4.4/bits/char_traits.h:cannot open source file
/usr/include/c++/4.4/bits/locale_facets.h:cannot open source file
Finished .info-file creation
Overall coverage rate:
   lines......: 14.3% (5 of 35 lines)
   functions..: 21.4% (3 of 14 functions)
   branches...: 20.0% (2 of 10 branches)

The warning "could not open output file" that you are seeing sounds a 
little as if your file system had problems (e.g. was full or read-only, 
etc.).


Regards,
   Peter Oberparleiter


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