CMake: add CXX for fuzzing

CMakeLists.txt

@@ -5,7 +5,14 @@ include(TestBigEndian)
 include(CheckCSourceCompiles)
 include(CheckSymbolExists)
 include(cmake/macros.cmake)
-project(libaec C)
+
+option(AEC_FUZZING "Enable build of fuzzing targets" OFF)
+if(AEC_FUZZING)
+  project(libaec C CXX)
+else(AEC_FUZZING)
+  project(libaec C)
+endif(AEC_FUZZING)
+
 set(libaec_VERSION_MAJOR 1)
 set(libaec_VERSION_MINOR 0)
 set(libaec_VERSION_PATCH 2)
@@ -53,8 +60,6 @@ include_directories("${PROJECT_SOURCE_DIR}/src")
 
 add_subdirectory(src)
 add_subdirectory(tests)
-
-option(AEC_FUZZING "Enable build of fuzzing targets" OFF)
 if(AEC_FUZZING)
   add_subdirectory(fuzzing)
 endif()