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[CMake] Enable package CMO only in newer compiler #2764

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merged 1 commit into from
Jul 30, 2024
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[CMake] Enable package CMO only in newer compiler #2764

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22 changes: 20 additions & 2 deletions cmake/modules/SwiftCompilerCapability.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,19 @@ macro(swift_supports_implicit_module module_name out_var)
)
endmacro()

function(swift_get_swiftlang_version out_var)
execute_process(
COMMAND "${CMAKE_Swift_COMPILER}" -version
OUTPUT_VARIABLE output ERROR_VARIABLE output
RESULT_VARIABLE result
TIMEOUT 10
)

if(output MATCHES [[swiftlang-([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)]])
set("${out_var}" "${CMAKE_MATCH_1}" PARENT_SCOPE)
endif()
endfunction()

# Get "package cross-module-optimization" compiler arguments suitable for the compiler.
function(swift_get_package_cmo_support out_var)
# > 6.0 : Fixed feature.
Expand All @@ -43,8 +56,13 @@ function(swift_get_package_cmo_support out_var)
-Xfrontend -experimental-package-bypass-resilience
)
if(result)
set(${out_var} EXPERIMENTAL PARENT_SCOPE)
return()
# Package CMO is implmented in Xcode 16 Beta 4 (swiftlang-6.0.0.6.8) or later.
# Consider it's not supported in non Xcode toolchain with "-experimental" options.
swift_get_swiftlang_version(swiftlang_version)
if(swiftlang_version AND swiftlang_version VERSION_GREATER_EQUAL 6.0.0.6)
set(${out_var} EXPERIMENTAL PARENT_SCOPE)
return()
endif()
endif()

# < 6.0 : Not supported.
Expand Down