[CMake] gcov: handling same file name in different directories

[Marco Craveiro]

hello cmakers,

i've been trying to use ctest's coverage support on a project that uses
the same file name in different directories, e.g.:

serialisation/some_class_name.hpp
streaming/some_class_name.hpp
...

due to the parameters passed in to gcov by ctest, this results in naming
clashes when generating the *.gcov files from the different *.gcda input
files.

symptoms of this problem:
-------------------------

1. errors such as:

  Error(s) while accumulating results:
  Problem reading source file: some_file_name line:45  out total: 49
  Looks like there are more lines in the file: };
  Looks like there are more lines in the file: 
  Looks like there are more lines in the file: 
....

debugging ctest revealed that each of these is actually an error in a
different file, all of which suffering from the name clashing.

2. an error at the end of ctest even though the submission is
successful:

...
   Submission successful
Error in read script: some_ctest_script.cmake

possible fix
------------

using your latest git, i managed to fix the problem by adding the -p
flag to the gcov invocation (--preserve-paths). this fixed my problems. 

i submit the patch for your consideration.

cheers

marco
-- 
Constraint has encouraged not only economy, but also a certain elegance
of design. -- Dennis Ritchie


-- 
Constraint has encouraged not only economy, but also a certain elegance
of design. -- Dennis Ritchie

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