debug: show lcov error messages

Author: scpeters

cmake/GzCodeCoverage.cmake

@@ -141,7 +141,7 @@ FUNCTION(gz_setup_target_for_coverage)
     # Capturing lcov counters and generating report
     COMMAND ${LCOV_PATH} ${_branch_flags} -q --no-checksum
       --directory ${PROJECT_BINARY_DIR} --capture
-      --output-file ${_outputname}.info 2>/dev/null
+      --output-file ${_outputname}.info
     # Remove negative counts
     COMMAND sed -i '/,-/d' ${_outputname}.info
     COMMAND ${LCOV_PATH} ${_branch_flags} -q