If gtest targets are already defined, use them. (#777)

This allows a project to include both googletest and benchmark as top-level git submodule. This allows incorporating Benchmark to an existing CMake project that already incorporates googletest. https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project https://github.com/abseil/abseil-cpp/tree/master/CMake#incorporating-abseil-into-a-cmake-project

If gtest targets are already defined, use them. (#777)
7d856b03 · Shuo Chen · Roman Lebedev · 823d2463 · 7d856b03
Commit 7d856b03 authored May 01, 2019 by Shuo Chen Committed by Roman Lebedev May 01, 2019
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CMakeLists.txt CMakeLists.txt +3 -1

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--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -267,7 +267,9 @@ add_subdirectory(src)

 if (BENCHMARK_ENABLE_TESTING)
  enable_testing()
-  if (BENCHMARK_ENABLE_GTEST_TESTS)
+  if (BENCHMARK_ENABLE_GTEST_TESTS AND
+      NOT (TARGET gtest AND TARGET gtest_main AND
+           TARGET gmock AND TARGET gmock_main))
    include(GoogleTest)
  endif()
  add_subdirectory(test)