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build: add an option to control WMO #1705

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Merged
compnerd merged 1 commit into from
May 26, 2023
Merged

build: add an option to control WMO #1705

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4 changes: 4 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,10 @@ set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib/${SWIFT_HOST_LIBRARI

set(CMAKE_MACOSX_RPATH YES)

option(SWIFT_SYNTAX_ENABLE_WMO_PRE_3_26
"Enable Whole Module Optimization (WMO) - requires swift-driver"
$<IF:$<AND:$<NOT:$<CONFIG:Debug>>,$<PLATFORM_ID:Darwin>>,YES,NO>)

include(AddSwiftHostLibrary)

# Ensure that we do not link the _StringProcessing module. But we can
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6 changes: 2 additions & 4 deletions cmake/modules/AddSwiftHostLibrary.cmake
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Expand Up @@ -56,11 +56,9 @@ function(add_swift_host_library name)
-emit-module-interface-path;${module_interface_file}
>)

if(NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
if(CMAKE_VERSION VERSION_LESS 3.26.0 AND SWIFT_SYNTAX_ENABLE_WMO_PRE_3_26)
target_compile_options(${name} PRIVATE
$<$<COMPILE_LANGUAGE:Swift>:
-wmo
>)
$<$<COMPILE_LANGUAGE:Swift>:-wmo>)
endif()

# NOTE: workaround for CMake not setting up include flags yet
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