Fetch content catch2 v3 globally

CMakeLists.txt

@@ -135,6 +135,8 @@ if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
   if(SERENE_ENABLE_THINLTO)
   endif()
 
+  include(GNUInstallDirs)
+  Include(FetchContent)
 
   # CCache support ==============================
   if(SERENE_DISABLE_CCACHE)
@@ -165,7 +167,18 @@ if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
     endif()
   endif()
 
-  include(GNUInstallDirs)
+
+  if(SERENE_BUILD_TESTING)
+    message(STATUS "Fetching Catch2 v3...")
+
+    FetchContent_Declare(
+      Catch2
+      GIT_REPOSITORY https://github.com/catchorg/Catch2.git
+      GIT_TAG        v3.0.0-preview4
+      )
+    FetchContent_MakeAvailable(Catch2)
+    list(APPEND CMAKE_MODULE_PATH ${catch2_SOURCE_DIR}/extras)
+  endif()
 
   # LLVM setup =========================================
   find_package(LLVM REQUIRED CONFIG)

libserene/CMakeLists.txt

@@ -19,6 +19,7 @@ include_directories(${INCLUDE_DIR})
 add_subdirectory(include)
 add_subdirectory(lib)
 
+# Install rules for libserene target
 install(TARGETS serene
   EXPORT SereneExports
   LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
@@ -26,6 +27,7 @@ install(TARGETS serene
   RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
 
 
+# Install rules for the public header files.
 install(DIRECTORY ${INCLUDE_DIR}/serene
   DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
   FILES_MATCHING
@@ -33,7 +35,7 @@ install(DIRECTORY ${INCLUDE_DIR}/serene
   PATTERN *.td
   PATTERN "CMake*" EXCLUDE)
 
-
+# Install rule for the public generated header files
 install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/
   DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
   FILES_MATCHING
@@ -44,6 +46,7 @@ install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/
 
 include(CMakePackageConfigHelpers)
 
+# Package config file let us use find_package with serene
 configure_package_config_file(
   "${CMAKE_CURRENT_SOURCE_DIR}/cmake/${PROJECT_NAME}Config.cmake.in"
   "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
@@ -65,6 +68,7 @@ install(FILES
   ${CMAKE_INSTALL_LIBDIR}/cmake/serene-${PROJECT_VERSION}
   )
 
+# Install the package exports
 install(EXPORT SereneExports
   DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/serene-${PROJECT_VERSION}
   NAMESPACE serene::)