Fix CMake benchmark build to not build googlebenchmark tests

CMakeLists.txt

@@ -50,27 +50,25 @@ if (FastAD_FOUND)
     set(AUTOPPL_LIBS ${AUTOPPL_LIBS} FastAD::FastAD)
 endif()
 
+# Set directory for GoogleTest
+set(GTEST_DIR ${CMAKE_CURRENT_SOURCE_DIR}/lib/benchmark/googletest/googletest)
+set(GBENCH_DIR ${CMAKE_CURRENT_SOURCE_DIR}/lib/benchmark)
+
+# Add lib subdirectory
+add_subdirectory(${PROJECT_SOURCE_DIR}/lib ${PROJECT_BINARY_DIR}/lib)
+
 # Configure tests
 if (AUTOPPL_ENABLE_TEST)
     include(CTest) # enable memcheck
     enable_testing()
-
-    # Set directories for third-party libraries
-    # tests in other subdirectories require access to these as well
-    set(GTEST_DIR ${CMAKE_CURRENT_SOURCE_DIR}/lib/benchmark/googletest/googletest)
-
     add_subdirectory(${PROJECT_SOURCE_DIR}/test ${PROJECT_BINARY_DIR}/test)
 endif()
 
 # Configure benchmarking
 if (AUTOPPL_ENABLE_BENCHMARK)
 	add_subdirectory(${PROJECT_SOURCE_DIR}/benchmark ${PROJECT_BINARY_DIR}/benchmark)
-    set(GBENCH_DIR ${CMAKE_CURRENT_SOURCE_DIR}/lib/benchmark)
 endif()
 
-# Add lib subdirectory
-add_subdirectory(${PROJECT_SOURCE_DIR}/lib ${PROJECT_BINARY_DIR}/lib)
-
 # Compile examples if enabled
 if (AUTOPPL_ENABLE_EXAMPLE)
     add_subdirectory(${PROJECT_SOURCE_DIR}/docs/example ${PROJECT_BINARY_DIR}/example)

lib/CMakeLists.txt

@@ -4,9 +4,9 @@ if (AUTOPPL_ENABLE_BENCHMARK)
     # Taken from https://github.com/google/benchmark
     # Recommended way to build google benchmark
     # Disable all tests within google benchmark.
-    set(BENCHMARK_ENABLE_TESTING OFF)
-    set(BENCHMARK_ENABLE_GTEST_TESTS OFF)
-    set(BENCHMARK_ENABLE_ASSEMBLY_TESTS OFF)
+    set(BENCHMARK_ENABLE_TESTING OFF CACHE BOOL "Disable GoogleBenchmark tests.")
+    set(BENCHMARK_ENABLE_GTEST_TESTS OFF CACHE BOOL "Disable GoogleBenchmark googletest tests.")
+    set(BENCHMARK_ENABLE_ASSEMBLY_TESTS OFF CACHE BOOL "Disable GoogleBenchmark assembly tests.")
     add_subdirectory(benchmark)
 endif()