Add LLVM

Author: adazem009

CMakeLists.txt

@@ -67,6 +67,7 @@ target_sources(scratchcpp
 
 if (LIBSCRATCHCPP_USE_LLVM)
     target_compile_definitions(scratchcpp PUBLIC USE_LLVM)
+
 else()
     target_sources(scratchcpp
       PUBLIC
@@ -103,6 +104,12 @@ if (LIBSCRATCHCPP_NETWORK_SUPPORT)
     target_compile_definitions(scratchcpp PRIVATE LIBSCRATCHCPP_NETWORK_SUPPORT)
 endif()
 
+if (LIBSCRATCHCPP_USE_LLVM)
+    include(build/HunterPackages.cmake)
+    include(build/LLVM.cmake)
+    target_link_libraries(scratchcpp PRIVATE LLVM)
+endif()
+
 target_compile_definitions(scratchcpp PRIVATE LIBSCRATCHCPP_LIBRARY)
 target_compile_definitions(scratchcpp PRIVATE LIBSCRATCHCPP_VERSION="${PROJECT_VERSION}")
 target_compile_definitions(scratchcpp PRIVATE LIBSCRATCHCPP_VERSION_MAJOR=${PROJECT_VERSION_MAJOR})

build/HunterPackages.cmake

@@ -0,0 +1,31 @@
+# https://layle.me/posts/using-llvm-with-cmake/
+# HUNTER_URL is the URL to the latest source code archive on GitHub
+# HUNTER_SHA1 is the hash of the downloaded archive
+
+set(OLD_PROJECT_NAME ${PROJECT_NAME})
+set(PROJECT_NAME "")
+
+set(HUNTER_URL "https://github.com/scratchcpp/hunter/archive/ee768cdd2c027b5be346f114e726d4b0c4296de6.zip")
+set(HUNTER_SHA1 "4A018750743AC656A859C99C655723EAF68EE038")
+
+set(HUNTER_LLVM_VERSION 19.1.0)
+set(HUNTER_LLVM_CMAKE_ARGS
+    LLVM_ENABLE_CRASH_OVERRIDES=OFF
+    LLVM_ENABLE_ASSERTIONS=ON
+    LLVM_ENABLE_ZLIB=OFF
+    LLVM_ENABLE_RTTI=ON
+    LLVM_BUILD_EXAMPLES=OFF
+    LLVM_BUILD_TOOLS=OFF
+    LLVM_BUILD_LLVM_DYLIB=ON
+    LLVM_INCLUDE_EXAMPLES=OFF
+    LLVM_TARGETS_TO_BUILD=host
+)
+
+set(HUNTER_PACKAGES LLVM)
+
+include(FetchContent)
+message(STATUS "Fetching hunter...")
+FetchContent_Declare(SetupHunter GIT_REPOSITORY https://github.com/cpp-pm/gate)
+FetchContent_MakeAvailable(SetupHunter)
+
+set(PROJECT_NAME ${OLD_PROJECT_NAME})

build/LLVM.cmake

@@ -0,0 +1,52 @@
+# https://layle.me/posts/using-llvm-with-cmake/
+# This is an INTERFACE target for LLVM, usage:
+#   target_link_libraries(${PROJECT_NAME} <PRIVATE|PUBLIC|INTERFACE> LLVM)
+# The include directories and compile definitions will be properly handled.
+
+set(CMAKE_FOLDER_LLVM "${CMAKE_FOLDER}")
+if(CMAKE_FOLDER)
+    set(CMAKE_FOLDER "${CMAKE_FOLDER}/LLVM")
+else()
+    set(CMAKE_FOLDER "LLVM")
+endif()
+
+# Find LLVM
+find_package(LLVM REQUIRED CONFIG)
+
+message(STATUS "Found LLVM ${LLVM_PACKAGE_VERSION}")
+message(STATUS "Using LLVMConfig.cmake in: ${LLVM_DIR}")
+
+# Split the definitions properly (https://weliveindetail.github.io/blog/post/2017/07/17/notes-setup.html)
+separate_arguments(LLVM_DEFINITIONS)
+
+# Some diagnostics (https://stackoverflow.com/a/17666004/1806760)
+message(STATUS "LLVM libraries: ${LLVM_LIBRARIES}")
+message(STATUS "LLVM includes: ${LLVM_INCLUDE_DIRS}")
+message(STATUS "LLVM definitions: ${LLVM_DEFINITIONS}")
+message(STATUS "LLVM tools: ${LLVM_TOOLS_BINARY_DIR}")
+
+if (NOT TARGET LLVM)
+    add_library(LLVM INTERFACE)
+endif()
+
+target_include_directories(LLVM SYSTEM INTERFACE ${LLVM_INCLUDE_DIRS})
+target_link_libraries(LLVM INTERFACE ${LLVM_AVAILABLE_LIBS})
+target_compile_definitions(LLVM INTERFACE ${LLVM_DEFINITIONS} -DNOMINMAX)
+
+set(CMAKE_FOLDER "${CMAKE_FOLDER_LLVM}")
+unset(CMAKE_FOLDER_LLVM)
+
+# MSVC-specific options
+if(MSVC)
+    # This assumes the installed LLVM was built in Release mode
+    set(CMAKE_C_FLAGS_RELWITHDEBINFO "/ZI /Od /Ob0 /DNDEBUG" CACHE STRING "" FORCE)
+    set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "/ZI /Od /Ob0 /DNDEBUG" CACHE STRING "" FORCE)
+
+    if(${LLVM_USE_CRT_RELEASE} STREQUAL "MD")
+        set(CMAKE_MSVC_RUNTIME_LIBRARY MultiThreadedDLL)
+    elseif(${LLVM_USE_CRT_RELEASE} STREQUAL "MT")
+        set(CMAKE_MSVC_RUNTIME_LIBRARY MultiThreaded)
+    else()
+        message(FATAL_ERROR "Unsupported LLVM_USE_CRT_RELEASE=${LLVM_USE_CRT_RELEASE}")
+    endif()
+endif()