[6.0] Explicitly link to Foundation in CMake builds (#709)

Cherry-pick #693 into `release/6.0` * **Explanation**: Previously in CMake builds, when `Foundation` was not in the regular search directory (e.g. resource directory or SDK search paths) `#if canImport(Foundation)` used to fail, and the functionalities are not included. This patch provides a way to provide `Foundation_DIR` for `find_packgage(Foundation CONFIG)`, so that clients can correctly link Testing to Foundation * **Scope**: CMake builds * **Risk**: Low. No actual code changes. * **Testing**: Passes current test suite Also manually tested the build toolchain * **Issues**: N/A * **Reviewer**: @stmontgomery

Author: rintaro

CMakeLists.txt

@@ -15,6 +15,13 @@ endif()
 project(SwiftTesting
  LANGUAGES CXX Swift)
 
+if(NOT APPLE)
+ if(NOT CMAKE_SYSTEM_NAME STREQUAL WASI)
+ find_package(dispatch CONFIG)
+ endif()
+ find_package(Foundation CONFIG)
+endif()
+
 include(GNUInstallDirs)
 
 list(APPEND CMAKE_MODULE_PATH

Sources/Testing/CMakeLists.txt

@@ -94,6 +94,14 @@ add_library(Testing
  Traits/Trait.swift)
 target_link_libraries(Testing PRIVATE
  _TestingInternals)
+if(NOT APPLE)
+ if(NOT CMAKE_SYSTEM_NAME STREQUAL WASI)
+ target_link_libraries(Testing PUBLIC
+ dispatch)
+ endif()
+ target_link_libraries(Testing PUBLIC
+ Foundation)
+endif()
 add_dependencies(Testing
  TestingMacros)
 target_compile_options(Testing PRIVATE