message: Add make target: benchmark.
diff: -.PHONY: all opt unit clean debug release release_expanded test unittest allunit docs doxygen format sqlite imdb
  +.PHONY: all opt unit clean debug release release_expanded test unittest allunit benchmark docs doxygen format sqlite imdb
  all: release
  opt: release
  @@ -194,6 +194,12 @@ relassert:
  cmake $(GENERATOR) $(FORCE_COLOR) ${WARNINGS_AS_ERRORS} ${FORCE_32_BIT_FLAG} ${DISABLE_UNITY_FLAG} ${DISABLE_SANITIZER_FLAG} ${STATIC_LIBCPP} ${EXTENSIONS} -DFORCE_ASSERT=1 -DCMAKE_BUILD_TYPE=RelWithDebInfo ../.. && \
  cmake --build . --config RelWithDebInfo
  +benchmark:
  + mkdir -p build/release && \
  + cd build/release && \
  + cmake $(GENERATOR) $(FORCE_COLOR) ${WARNINGS_AS_ERRORS} ${FORCE_WARN_UNUSED_FLAG} ${FORCE_32_BIT_FLAG} ${DISABLE_UNITY_FLAG} ${DISABLE_SANITIZER_FLAG} ${OSX_BUILD_UNIVERSAL_FLAG} ${STATIC_LIBCPP} ${EXTENSIONS} -DBUILD_BENCHMARKS=1 -DCMAKE_BUILD_TYPE=Release ../.. && \
  + cmake --build . --config Release
  +
  amaldebug:
  mkdir -p build/amaldebug && \
  python scripts/amalgamation.py && \
  