Disable tests for benchmark library build

The tests of the google-benchmark package fail to build on systems
that do not have an executbale named `python` in the path. Systems like
CentOS only provide `python3` nowadays.

This just disables the tests as we don't need them.

Differential Revision: https://reviews.llvm.org/D151917

Author: MatzeB

MicroBenchmarks/libs/CMakeLists.txt

@@ -4,18 +4,9 @@ set(CMAKE_CXX_STANDARD 11)
 set(HAVE_STD_REGEX 1)
 # When enforcing c++11 we need to disable one of the benchmark library's tests
 set(BENCHMARK_HAS_CXX03_FLAG 0)
+# Tests fail build on system with just "python3" but no "python" executable.
+set(BENCHMARK_ENABLE_GTEST_TESTS OFF)
+set(BENCHMARK_ENABLE_ASSEMBLY_TESTS OFF)
 
 add_subdirectory(benchmark)
 test_suite_add_build_dependencies(benchmark)
-test_suite_add_build_dependencies(output_test_helper)
-test_suite_add_build_dependencies(gtest)
-test_suite_add_build_dependencies(gmock)
-
-# These tests, when built with BENCHMARK_ENABLE_ASSEMBLY_TESTS is on.
-# They don't depend on the above, so we need to list them explicitly.
-if (BENCHMARK_ENABLE_ASSEMBLY_TESTS)
-  test_suite_add_build_dependencies(donotoptimize_assembly_test)
-  test_suite_add_build_dependencies(state_assembly_test)
-  test_suite_add_build_dependencies(clobber_memory_assembly_test)
-endif()
-