How to make gcov and gcovr pick up source and header files - gcov

Question

I am trying to generate coverage report for project using .bat file as detailed below.
I see very few .gcov files. Also, when I click on link on generated html output, I am not able to see file details (file not found error). How do I fix it?
After I execute .bat file, I see output like ‘parsing coverage data for QString.h’ (QT library files). Is it expected?
I have seen many related questions but I am not able to figure out
(in report_coverage.bat)
set GCovrpath= C:\python37\script\lib\
set GCovpath= C:\abc\ghj\bin\
set datafiles= C:\source\mywork\root\testing\unittests\rose\build\debug\
set gcovr_src= C:\source\mywork\root\
%GCovpath%gcov.exe %datafiles% >> output.log
gcovr %datafiles% -s -p --html --html-details --gcov-executable %GCovpath%gcov.exe -o Test.html –verbose
Here are details….
Compile and execute code using
QMAKE_CXXFLAGS += -fprofile-arcs -ftest-coverage
QMAKE_LFLAGS += --coverage
.GCNO and .GCDA files are generated as expected
It seems simple directory structure
Root
Header
Rose
Marigold
Jasmin
Source
Rose
Marigold
Jasmin
Testing
UnitTests
Rose
build
debug
Marigold
build
debug
Jasmin
build
debug
Thank you.
Update:
See answer below

Answer 1

I can not emphasis enough "\" for windows.
run this command from debug folder(because test.exe is here)
gcov -b -l -s C:\source\mywork\root\ debug\*.gcno
run this command from Unit tests folder (this will exclude .h files and files containing test)
gcovr -g -k -v --root C:\source\mywork\root\ -e ".*\.h" -e ".*test[_-|A-Z|a-z|0-9]*\.cpp" --html --html-details -o report.html

Answer 2

If you invoke gcov yourself, you need to run it from the same directory where the compiler was executed, and you need to give it either the path to the gcno, gcda, or source file. Gcov can only handle one input file at a time.
When gcov runs in the correct place, it can look at compilation metadata to find the correct source file. If there are errors about missing source files, that indicates that you didn't use the correct directory.
Gcovr runs gcov automatically, and has heuristics to figure out the correct directory. However, you should still run it from the directory where you started the compilation (typically, a build directory).
And gcovr will exclude coverage data if it doesn't belong to your project. If you have a separate build directory, you will need to set the --root argument to the directory containing your source code. Gcov processes coverage data for all files that were compiled, which makes this post-processing by gcovr necessary.
In verbose mode, gcovr will output “Parsing coverage data for <file>” when opening a gcov report. It will then use data within the file to decide whether it belongs to your project, and output “Filtering coverage data” if the source code is part of your project, “Excluding coverage data” otherwise.
There are multiple reasons why the coverage report might not be complete:
There is a problem with filtering.
Gcovr's heuristics can get confused when multiple files have the same name, e.g. two files called util.h in different directories.
Gcovr's --html-details report consists of multiple .html files, so make sure that they are all available.
In your BAT file, this invocation might work better:
gcovr --root ../src --print-summary --sort-percentage --html-details --gcov-executable %GCovpath%gcov.exe --output Test.html --verbose
assuming the following directory structure, and that you run gcovr from within build/:
your-project/
src/
Header/
...
Source/
...
Testing/
...
build/
...
If there are problems with a root path like ../src, consider using an absolute path like C:/path/to/the/src.