diff options
Diffstat (limited to 'Modules/CMakeDetermineSwiftCompiler.cmake')
| -rw-r--r-- | Modules/CMakeDetermineSwiftCompiler.cmake | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/Modules/CMakeDetermineSwiftCompiler.cmake b/Modules/CMakeDetermineSwiftCompiler.cmake index aaad5601da..f0a63a8cff 100644 --- a/Modules/CMakeDetermineSwiftCompiler.cmake +++ b/Modules/CMakeDetermineSwiftCompiler.cmake @@ -63,6 +63,65 @@ if(NOT CMAKE_Swift_COMPILER_ID_RUN) CMAKE_DETERMINE_COMPILER_ID(Swift "" CompilerId/main.swift) endif() +# Check if we are using the old compiler driver. +if(CMAKE_GENERATOR STREQUAL "Xcode") + # For Xcode, we can decide driver kind simply by Swift version. + if(CMAKE_Swift_COMPILER_VERSION VERSION_GREATER_EQUAL 5.5) + set(CMAKE_Swift_COMPILER_USE_OLD_DRIVER FALSE) + else() + set(CMAKE_Swift_COMPILER_USE_OLD_DRIVER TRUE) + endif() +elseif(NOT DEFINED CMAKE_Swift_COMPILER_USE_OLD_DRIVER) + # Dry-run a WMO build to identify the compiler driver. + + # Create a clean directory in which to run the test. + set(CMAKE_Swift_COMPILER_DRIVER_TEST_DIR ${CMAKE_PLATFORM_INFO_DIR}/SwiftCompilerDriver) + file(REMOVE_RECURSE "${CMAKE_Swift_COMPILER_DRIVER_TEST_DIR}") + file(MAKE_DIRECTORY "${CMAKE_Swift_COMPILER_DRIVER_TEST_DIR}") + + # Create a Swift file and an arbitrary linker resource. + file(WRITE ${CMAKE_Swift_COMPILER_DRIVER_TEST_DIR}/main.swift "print(\"Hello\")\n") + file(WRITE ${CMAKE_Swift_COMPILER_DRIVER_TEST_DIR}/lib.in "\n") + + # Honor user-specified compiler flags. + if(DEFINED CMAKE_Swift_FLAGS) + separate_arguments(_CMAKE_Swift_COMPILER_FLAGS_LIST NATIVE_COMMAND "${CMAKE_Swift_FLAGS}") + else() + separate_arguments(_CMAKE_Swift_COMPILER_FLAGS_LIST NATIVE_COMMAND "${CMAKE_Swift_FLAGS_INIT}") + endif() + set(_CMAKE_Swift_COMPILER_CHECK_COMMAND "${CMAKE_Swift_COMPILER}" ${_CMAKE_Swift_COMPILER_FLAGS_LIST} -wmo main.swift lib.in "-###") + unset(_CMAKE_Swift_COMPILER_FLAGS_LIST) + + # Execute in dry-run mode so no compilation will be actually performed. + execute_process(COMMAND ${_CMAKE_Swift_COMPILER_CHECK_COMMAND} + WORKING_DIRECTORY "${CMAKE_Swift_COMPILER_DRIVER_TEST_DIR}" + OUTPUT_VARIABLE _CMAKE_Swift_COMPILER_CHECK_OUTPUT) + + # Check the first frontend execution. It is on the first line of output. + # The old driver treats all inputs as Swift sources while the new driver + # can identify "lib.in" as a linker resource. + if("${_CMAKE_Swift_COMPILER_CHECK_OUTPUT}" MATCHES "^[^\n]* lib\\.in") + set(CMAKE_Swift_COMPILER_USE_OLD_DRIVER TRUE) + else() + set(CMAKE_Swift_COMPILER_USE_OLD_DRIVER FALSE) + endif() + + # Record the check results in the configure log. + list(TRANSFORM _CMAKE_Swift_COMPILER_CHECK_COMMAND PREPEND "\"") + list(TRANSFORM _CMAKE_Swift_COMPILER_CHECK_COMMAND APPEND "\"") + list(JOIN _CMAKE_Swift_COMPILER_CHECK_COMMAND " " _CMAKE_Swift_COMPILER_CHECK_COMMAND) + string(REPLACE "\n" "\n " _CMAKE_Swift_COMPILER_CHECK_OUTPUT " ${_CMAKE_Swift_COMPILER_CHECK_OUTPUT}") + message(CONFIGURE_LOG + "Detected CMAKE_Swift_COMPILER_USE_OLD_DRIVER=\"${CMAKE_Swift_COMPILER_USE_OLD_DRIVER}\" from:\n" + " ${_CMAKE_Swift_COMPILER_CHECK_COMMAND}\n" + "with output:\n" + "${_CMAKE_Swift_COMPILER_CHECK_OUTPUT}" + ) + + unset(_CMAKE_Swift_COMPILER_CHECK_COMMAND) + unset(_CMAKE_Swift_COMPILER_CHECK_OUTPUT) +endif() + if (NOT _CMAKE_TOOLCHAIN_LOCATION) get_filename_component(_CMAKE_TOOLCHAIN_LOCATION "${CMAKE_Swift_COMPILER}" PATH) endif () |