Include full checking for performance test suite.

Author: tkremenek

benchmark/CMakeLists.txt

@@ -1,4 +1,16 @@
-
-if (EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/PerfTestSuite/CMakeLists.txt)
-  add_subdirectory(PerfTestSuite)
+option(SWIFT_INCLUDE_PERF_TESTSUITE "Create targets for swift performance benchmarks." YES)
+if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+  # Performance test harness only builds on Darwin.
+  if (SWIFT_INCLUDE_PERF_TESTSUITE)
+    set(PERF_TESTSUITE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/PerfTestSuite" CACHE STRING "Path to swift performance testsuite repo.")
+    if(EXISTS ${PERF_TESTSUITE_DIR}/CMakeLists.txt)
+      add_subdirectory(${PERF_TESTSUITE_DIR})
+    else()
+      message(FATAL_ERROR "Can't find the Swift performance suite at ${PERF_TESTSUITE_DIR}/.")
+    endif()
+    add_custom_target(benchmark-swift
+        DEPENDS benchmark-swift PerfTests_Onone PerfTests_O
+        PerfTests_Ounchecked)
+  endif()
 endif()
+