[libFuzzer tests] Only enable libFuzzer tests if

-DLIBFUZZER_ENABLE_TESTS=ON is set.

llvm-svn: 310100

llvm/docs/LibFuzzer.rst

@@ -628,8 +628,7 @@ LibFuzzer is built as a part of LLVM project by default on macos and Linux.
 Users of other operating systems can explicitly request compilation using
 ``-DLIBFUZZER_ENABLE=YES`` flag.
 Tests are run using ``check-fuzzer`` target from the build directory
-(note that tests will take a long time to run if the compiler was compiled
-without optimizations):
+which was configured with ``-DLIBFUZZER_ENABLE_TESTS=ON`` flag.
 
 .. code-block:: console
 

llvm/lib/Fuzzer/CMakeLists.txt

@@ -22,6 +22,7 @@ endif()
 # Compile libFuzzer if the compilation is specifically requested, OR
 # if the platform is known to be working.
 set(LIBFUZZER_ENABLE ${LIBFUZZER_ENABLED_CHECK} CACHE BOOL "Build libFuzzer and its tests")
+set(LIBFUZZER_ENABLE_TESTS OFF CACHE BOOL "Build libFuzzer and its tests")
 
 if (LIBFUZZER_ENABLE)
   add_library(LLVMFuzzerNoMainObjects OBJECT
@@ -65,7 +66,7 @@ if (MSVC)
   add_custom_command(TARGET check-fuzzer
     COMMAND cmake -E echo "check-fuzzer is disalbed on Windows")
 else()
-  if (LLVM_INCLUDE_TESTS AND LIBFUZZER_ENABLE)
+  if (LLVM_INCLUDE_TESTS AND LIBFUZZER_ENABLE_TESTS)
     add_subdirectory(test)
   endif()
 endif()

llvm/lib/Fuzzer/test/CMakeLists.txt

@@ -47,7 +47,6 @@ include_directories(..)
 set(LIBFUZZER_TEST_COMPILER ${LLVM_RUNTIME_OUTPUT_INTDIR}/clang)
 set(LIBFUZZER_TEST_CXX_COMPILER ${LLVM_RUNTIME_OUTPUT_INTDIR}/clang++)
 
-if ((TARGET asan) AND (TARGET clang))
 # LIT-based libFuzzer tests.
 configure_lit_site_cfg(
   ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.in
@@ -65,5 +64,3 @@ if ((TARGET asan) AND (TARGET clang))
   DEPENDS LLVMFuzzer-Unittest)
 
 add_dependencies(check-fuzzer LLVMFuzzer asan clang llvm-symbolizer FileCheck sancov not)
-endif()
-