Actually set coverage env flag

.gitlab-ci.yml

@@ -77,6 +77,7 @@ build synapse arm64:
         -DHUNTER_ENABLED=ON -DBUILD_SHARED_LIBS=OFF
         -DCMAKE_BUILD_TYPE=Release -DHUNTER_CONFIGURATION_TYPES=Debug
         -DCI_BUILD=ON
+        -DCOVERAGE=${COVERAGE}
     - cmake --build build
     - MTXCLIENT_SERVER=synapse GTEST_OUTPUT=xml:junit-output/ make test
   cache:
@@ -95,6 +96,7 @@ build linux amd64:
   tags: [docker]
   variables:
     M_ARCH: x86_64
+    COVERAGE: "ON"
   after_script:
     - ./.ci/coverage.sh &&  bash <(curl -s https://codecov.io/bash) -f build/coverage.info || echo "Codecov failed"
 

examples/CMakeLists.txt

@@ -19,6 +19,9 @@ CHECK_INCLUDE_FILE_CXX("filesystem" HAVE_STD_FILESYSTEM)
 if (HAVE_STD_FILESYSTEM)
   add_executable(media_downloader media_downloader.cpp)
   target_link_libraries(media_downloader MatrixClient::MatrixClient)
+  if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+    target_link_libraries(media_downloader stdc++fs)
+  endif()
 endif()
 
 add_executable(simple_bot simple_bot.cpp)