Parallelize Unix Makefiles builds only.

.travis.yml

@@ -206,6 +206,7 @@ before_script:
 - if [[ -z $env_cmake_c_compiler ]]; then export env_cmake_c_compiler=$CC; fi
 - if [[ -z $env_cmake_generator ]]; then export env_cmake_generator="Unix Makefiles"; fi
 - if [[ $env_cmake_generator == "Unix Makefiles" ]]; then export env_cmake_generator_specific="-j2"; fi
+- if [[ $env_cmake_generator == "Unix Makefiles" ]]; then export env_ctest_generator_specific="-j16"; fi
 - if [[ $EMSCRIPTEN ]]; then env_cmake_toolchain="-DCMAKE_TOOLCHAIN_FILE=$EMSCRIPTEN/cmake/Modules/Platform/Emscripten.cmake"; fi
 
 # Display cmake version
@@ -219,9 +220,9 @@ script:
 - echo $env_cmake_toolchain
 - cmake -G "$env_cmake_generator" $env_cmake_toolchain -DCMAKE_CXX_COMPILER=$env_cmake_cxx_compiler -DCMAKE_C_COMPILER=$env_cmake_c_compiler -DCMAKE_BUILD_TYPE=$env_cmake_configuration -Dozz_build_cpp11=$env_build_cpp11 -Dozz_build_fbx=$env_build_fbx -Dozz_build_data=$env_build_data -Dozz_build_howtos=$env_build_howtos -Dozz_build_samples=$env_build_samples -Dozz_build_simd_ref=$env_build_simd_ref -Dozz_build_tests=$env_build_tests $env_src_root
 # Build
-- cmake --build ./ --config $env_cmake_configuration --use-stderr -- $env_cmake_generator_specific -j4
+- cmake --build ./ --config $env_cmake_configuration --use-stderr -- $env_cmake_generator_specific
 # Test
-- ctest --build-config $env_cmake_configuration --output-on-failure -- $env_cmake_generator_specific -j16
+- ctest --build-config $env_cmake_configuration --output-on-failure -- $env_ctest_generator_specific
 
 after_success:
 - echo after_success-----------------------------------------------------------