cmake: symlink framework ABI baseline data into the build directory

When running the ABI checker from the build artifact, the executable
should be able to find baselines in the same relative paths as if
it's running from a toolchain.

Author: nkcsgexi

utils/api_checker/CMakeLists.txt

@@ -1,9 +1,29 @@
+set(framework "FrameworkABIBaseline")
 swift_install_in_component(FILES "swift-api-checker.py"
                            DESTINATION "bin"
                            COMPONENT toolchain-tools)
 swift_install_in_component(DIRECTORY "sdk-module-lists"
                            DESTINATION "bin"
                            COMPONENT toolchain-tools)
-swift_install_in_component(DIRECTORY "FrameworkABIBaseline"
+swift_install_in_component(DIRECTORY "${framework}"
                            DESTINATION "lib/swift"
                            COMPONENT toolchain-tools)
+
+# Add symlink of FrameworkABIBaseline to the build dir. This ensures we can
+# find the baseline data from the same relative path as if we are running the
+# checker from the toolchain.
+set(SWIFTLIB_DIR "${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib/swift")
+set(dest "${SWIFTLIB_DIR}/${framework}")
+set(source "${CMAKE_CURRENT_SOURCE_DIR}/${framework}")
+
+if(CMAKE_SYSTEM_NAME STREQUAL Windows)
+    set(CMAKE_SYMLINK_COMMAND copy)
+else()
+    set(CMAKE_SYMLINK_COMMAND create_symlink)
+endif()
+add_custom_command(OUTPUT "${dest}"
+                   DEPENDS "${source}"
+                   COMMAND "${CMAKE_COMMAND}" "-E" "${CMAKE_SYMLINK_COMMAND}" "${source}" "${dest}")
+add_custom_target("symlink_abi_checker_data" ALL
+                  DEPENDS "${dest}"
+                  COMMENT "Symlinking ABI checker baseline data to ${dest}")