Merge pull request #226 from gudnimg/parallel-unit-tests

Run unit tests in parallel when possible

tests/CMakeLists.txt

@@ -15,12 +15,25 @@ if(GCOV_ENABLE)
     COMMAND ${CMAKE_COMMAND} -E remove ${PROJECT_BINARY_DIR}/.ctest-finished
     )
 
+  set(ctest_test_args --timeout 30 --output-on-failure)
+
+  include(ProcessorCount)
+  ProcessorCount(N)
+  if(N EQUAL 0)
+    message(
+      WARNING "CTest: There was an issue reading the core count, tests won't be run in parallel"
+      )
+  else()
+    message(STATUS "CTest: Detected ${N} CPU threads")
+    set(ctest_test_args -j${N} ${ctest_test_args})
+  endif()
+
   # This step needs to always return OK but log whether it was successful or not. The thought here
   # is that if the tests all pass, .ctest-finished is created and we can check for its existance
   # after generating the report to determine if the overall build result is a pass or fail.
   add_custom_target(
     test_run_all
-    COMMAND ${CMAKE_COMMAND} -E env CTEST_OUTPUT_ON_FAILURE=1 ${CMAKE_CTEST_COMMAND} --timeout 30
+    COMMAND ${CMAKE_CTEST_COMMAND} ${ctest_test_args}
     COMMAND ${CMAKE_COMMAND} -E touch .ctest-finished || exit 0
     BYPRODUCTS ${PROJECT_BINARY_DIR}/.ctest-finished
     WORKING_DIRECTORY "${PROJECT_BINARY_DIR}"