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lcov and gcovr -r . not generating the code coverage report for *.cpp files.

I am new to googletest framework. I have written a UT to test the code functionality and compiled the code with options -fprofile-arcs -ftest-coverage --coverage and lgcov in Makefiles. After executing the test-cases, I am able to see the *.gcno and .gcda files. But not getting the proper code coverage report.

Step 1: update the Makefile --> -fprofile-arcs -ftest-coverage --coverage
Step 2: build the code.
Step 3: running the test cases.
Step 4: gcovr -r .

Observed: Not getting *.cpp file coverage for which test cases are execute.

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I had some troubles getting my test coverage set up, but I finally got it working. Although I'm not use the tools you are using.

I'm using clang++ and the LLVM tools. And I'm using my own barebones unit testing framework, which is similar to Catch2 (but not nearly as fully featured as Catch2).

Here are the commands I run, in case this is of help to you:

clang++ -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-padded -Wno-c99-compat -pedantic -fsanitize=undefined,null -std=c++17 -O0 -g -fprofile-instr-generate -fcoverage-mapping Experiment.cpp

./a.out --test-noisy --test-only

llvm-profdata merge -sparse default.profraw -o default.profdata

llvm-cov show -format=html -tab-size=4 ./a.out -instr-profile=default.profdata Experiment.cpp > default.html

echo '<style>pre { font-family: Monaco, Consolas, monospace; }</style>' >> default.html

I'd like to have responded in a comment, but this response is too long and needed the formatting for legibility. If deemed inappropriate (via downvotes) I'll delete it.

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