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Fix AppleClang module build

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This commit is contained in:
Victor Zverovich 2026-09-04 15:31:24 -07:00
parent 1dd74c0c82
commit 3894ae35ef
1 changed files with 29 additions and 3 deletions
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32
CMakeLists.txt
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@ -365,8 +365,32 @@ function (add_module_library name)
target_compile_options(${name} PUBLIC -fmodules-ts)
endif ()
# `std` is affected by CMake options and may be higher than C++20.
set(module_compile_options)
if (CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
# AppleClang requires explicit module and SDK flags when precompiling.
execute_process(
COMMAND xcrun --sdk "${CMAKE_OSX_SYSROOT}" --show-sdk-path
RESULT_VARIABLE module_sdk_result
OUTPUT_VARIABLE module_sysroot
ERROR_VARIABLE module_sdk_error
OUTPUT_STRIP_TRAILING_WHITESPACE)
if (NOT module_sdk_result EQUAL 0 OR NOT module_sysroot)
message(FATAL_ERROR "Failed to find Apple SDK: ${module_sdk_error}")
endif ()
set(module_compile_options -fcxx-modules -isysroot "${module_sysroot}")
target_compile_options(${name} PUBLIC ${module_compile_options})
endif ()
# The standard and extension mode are affected by CMake options.
get_target_property(std ${name} CXX_STANDARD)
get_target_property(extensions ${name} CXX_EXTENSIONS)
if (extensions STREQUAL "extensions-NOTFOUND")
set(extensions ON)
endif ()
set(std_prefix c++)
if (extensions)
set(std_prefix gnu++)
endif ()
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
set(pcms)
@ -384,8 +408,9 @@ function (add_module_library name)
add_custom_command(
OUTPUT ${pcm}
COMMAND
${CMAKE_CXX_COMPILER} -std=c++${std} -x c++-module --precompile -c -o
${pcm} ${CMAKE_CURRENT_SOURCE_DIR}/${src}
${CMAKE_CXX_COMPILER} ${module_compile_options}
-std=${std_prefix}${std} -x c++-module --precompile -o ${pcm}
${CMAKE_CURRENT_SOURCE_DIR}/${src}
"-I$<JOIN:$<TARGET_PROPERTY:${name},INCLUDE_DIRECTORIES>,;-I>"
# Required by the -I generator expression above.
COMMAND_EXPAND_LISTS
@ -403,6 +428,7 @@ function (add_module_library name)
OUTPUT ${obj}
COMMAND ${CMAKE_CXX_COMPILER} $<TARGET_PROPERTY:${name},COMPILE_OPTIONS>
-c -o ${obj} ${pcm}
COMMAND_EXPAND_LISTS
DEPENDS ${pcm})
endforeach ()
endif ()