cmake - CTest generate and submit gcov.tar to CDash after make <target> -

i have set cdash on local machine , i'm using ctest upload testing results cdash - generating .gcov-files containing branch coverage info , packing them gcov.tar beforehand (this modified version of example https://blog.kitware.com/additional-coverage-features-in-cdash/):

cmakelists.txt:

cmake_minimum_required(version 3.2) project(branch_coverage_example)  add_executable(foo foo.cxx) include(ctest) add_test(name foo command foo)  include(branchcoverage) 

branchcoverage.cmake within cmake modules path:

if(${cmake_build_type} strequal "profiling")     option(always_generate_branch_coverage_info "run gcov branch coverage part of target" on)      if(always_generate_branch_coverage_info)         add_custom_target(branchcoverage)          add_custom_command(target branchcoverage             post_build             command ${cmake_ctest_command} -d experimentalsubmit -s cdash_tarball.cmake             working_directory ${cmake_source_dir}             comment "generating gcov.tar containing branch coverage info..."             )          add_dependencies(branchcoverage experimental)     endif() endif() 

ctestconfig.cmake:

## file should placed in root directory of project. ## modify cmakelists.txt file in root directory of ## project incorporate testing dashboard. ## ## # following required submit cdash dashboard: ##   enable_testing() ##   include(ctest)  set(ctest_project_name "branchcoverageexample") set(ctest_nightly_start_time "01:00:00 utc")  set(ctest_drop_method "http") set(ctest_drop_site "localhost") set(ctest_drop_location "/cdash/public/submit.php?project=branchcoverageexample") set(ctest_drop_site_cdash true) 

cdash_upload.cmake:

# start, configure, build, test, coverage , submit # have been executed make <target> beforehand!  # generate gcov tarball , upload cdash. include(ctestcoveragecollectgcov) ctest_coverage_collect_gcov(   tarball gcov.tar   source ${ctest_source_directory}   build ${ctest_binary_directory}   gcov_command ${ctest_coverage_command}   gcov_options -l -p -b ) if(exists "${ctest_binary_directory}/gcov.tar")   ctest_submit(cdash_upload "${ctest_binary_directory}/gcov.tar"     cdash_upload_type gcovtar) endif() 

it works when invoke script example using ctest directly:

ctest -v -s run_example.cmake 

this gives me wonderful branch coverage information in cdash. not:

make experimental 

it ends saying:

generating gcov.tar containing branch coverage info... cmake error @ /usr/local/share/cmake-3.6/modules/ctestcoveragecollectgcov.cmake:118 (file):   file strings file "/cmakefiles/targetdirectories.txt" cannot read. call stack (most recent call first):   cdash_tarball.cmake:2 (ctest_coverage_collect_gcov)   ctest_coverage_collect_gcov: no .gcda files found, ignoring coverage request. 

i guess has paths/env vars need give cdash_upload.cmake, when using -dctest_source_directory @ add_custom_command in branchcoverage.cmake, cdash returns "bad http response", doesn't give me indication should fix , where.

do guys have idea? in advance!