Simplify CMake build files.

PiperOrigin-RevId: 764548411

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e38c072..0d5c514 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,13 +52,9 @@
 include(cmake/FuzzTestHelpers.cmake)
 include(cmake/CompatibilityModeLinkLibFuzzer.cmake)
 
-include_directories(${re2_SOURCE_DIR})
-
 if (FUZZTEST_BUILD_TESTING)
   enable_testing()
-endif ()
 
-if (FUZZTEST_BUILD_TESTING)
   set(protobuf_PROTOC_EXE "${protobuf_BINARY_DIR}/protoc")
   include(${protobuf_SOURCE_DIR}/cmake/protobuf-generate.cmake)
 endif ()
@@ -71,6 +67,7 @@
 add_subdirectory(grammar_codegen)
 add_subdirectory(grammar_codegen/generated_antlr_parser)
 add_subdirectory(tools)
+
 if (FUZZTEST_BUILD_TESTING)
   add_subdirectory(domain_tests)
   add_subdirectory(e2e_tests)

domain_tests/CMakeLists.txt

diff --git a/domain_tests/CMakeLists.txt b/domain_tests/CMakeLists.txt
index d7f5088..e963ffd 100644
--- a/domain_tests/CMakeLists.txt
+++ b/domain_tests/CMakeLists.txt
@@ -1,8 +1,3 @@
-get_filename_component(PARENT_DIR ../ ABSOLUTE)
-include_directories(${PARENT_DIR})
-
-include_directories(${CMAKE_BINARY_DIR})
-
 fuzztest_cc_test(
   NAME
     aggregate_combinators_test

e2e_tests/CMakeLists.txt

diff --git a/e2e_tests/CMakeLists.txt b/e2e_tests/CMakeLists.txt
index 75a1eb9..e95c990 100644
--- a/e2e_tests/CMakeLists.txt
+++ b/e2e_tests/CMakeLists.txt
@@ -1,5 +1,3 @@
-get_filename_component(PARENT_DIR ../ ABSOLUTE)
-include_directories(${PARENT_DIR})
 
 fuzztest_cc_library(
   NAME

e2e_tests/testdata/CMakeLists.txt

diff --git a/e2e_tests/testdata/CMakeLists.txt b/e2e_tests/testdata/CMakeLists.txt
index 4fedf20..3931793 100644
--- a/e2e_tests/testdata/CMakeLists.txt
+++ b/e2e_tests/testdata/CMakeLists.txt
@@ -1,7 +1,3 @@
-get_filename_component(PARENT_DIR ../ ABSOLUTE)
-include_directories(${PARENT_DIR})
-
-include_directories(${CMAKE_BINARY_DIR})
 add_executable(
   fuzz_tests_for_microbenchmarking
   fuzz_tests_for_microbenchmarking.cc

fuzztest/CMakeLists.txt

diff --git a/fuzztest/CMakeLists.txt b/fuzztest/CMakeLists.txt
index 62a854a..7d191f7 100644
--- a/fuzztest/CMakeLists.txt
+++ b/fuzztest/CMakeLists.txt
@@ -12,9 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-get_filename_component(PARENT_DIR ../ ABSOLUTE)
-include_directories(${PARENT_DIR})
-
 if (NOT COMPILER_GCC)
   SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize-coverage=0")
   SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize-coverage=0")

grammar_codegen/CMakeLists.txt

diff --git a/grammar_codegen/CMakeLists.txt b/grammar_codegen/CMakeLists.txt
index bf430bb..09f7d85 100644
--- a/grammar_codegen/CMakeLists.txt
+++ b/grammar_codegen/CMakeLists.txt
@@ -1,5 +1,3 @@
-get_filename_component(PARENT_DIR ../ ABSOLUTE)
-include_directories(${PARENT_DIR})
 
 add_library(
   grammar_info