[CMake] Problem measuring coverage in CTest scripts

[Maarten Anonymous]

Hey,

I have a question about using CMake+CTest+CTest scripts for coverage tests.

If I manually build the project and run "make ExperimantalCoverage" in a
build folder,
the coverage succeeds.
If I run the coverage from within a CTest script,
it fails.

Am I forgetting something?

A minimum example that exhibits my problem can be found at
https://gist.github.com/madebr/07ebd0de59e789cd819643b58db25df9.

This works:
mkdir build && cd build && cmake .. && make && make test && make
ExperimentalCoverage && cd ..
This fails:
ctest -S test.ctest

Source listing:
###################
#CMakeLists.txt:
###################
cmake_minimum_required(VERSION 3.9)
project(cmake_coverage)

file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/main.c" "int main() {return 0;}")

add_executable(main
    main.c
    )

target_compile_options(main
    PUBLIC
        "-O0"
        "-fprofile-arcs"
        "-ftest-coverage"
    )

target_link_libraries(main
    gcov
    )

include(CTest)
enable_testing()

add_test(NAME test
    COMMAND main
    )

##############
# test.ctest:
##############
set(CTEST_SOURCE_DIRECTORY "${CTEST_SCRIPT_DIRECTORY}")
set(CTEST_BINARY_DIRECTORY "${CTEST_SCRIPT_DIRECTORY}/build/ctest")

ctest_empty_binary_directory("${CTEST_BINARY_DIRECTORY}")

set(CTEST_SITE "${CMAKE_SYSTEM_NAME}")
set(CTEST_BUILD_NAME "experimental build")

set(CTEST_CMAKE_GENERATOR "Ninja")
set(CTEST_COVERAGE_COMMAND "gcov")

ctest_start("Experimental")
ctest_configure()
ctest_build()
ctest_test()
ctest_coverage()

##############
# CTestConfig.cmake:
##############
set(CTEST_PROJECT_NAME "Simple ctest_coverage project")
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/cmake/attachments/20171028/c796bbec/attachment.html>