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[libc++][modules] Re-add build dir CMakeLists.txt. (#81370)
This CMakeLists.txt is used to build modules without build system support. This was removed in d06ae33. This is used in the documentation how to use modules. Made some minor changes to make it work with the std.compat module using the std module. Note the CMakeLists.txt in the build dir should be removed once build system support is generally available. (cherry picked from commit fc0e9c8)
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Original file line number | Diff line number | Diff line change |
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cmake_minimum_required(VERSION 3.26) | ||
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project(libc++-modules LANGUAGES CXX) | ||
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# Enable CMake's module support | ||
if(CMAKE_VERSION VERSION_LESS "3.28.0") | ||
if(CMAKE_VERSION VERSION_LESS "3.27.0") | ||
set(CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API "2182bf5c-ef0d-489a-91da-49dbc3090d2a") | ||
else() | ||
set(CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API "aa1f7df0-828a-4fcd-9afc-2dc80491aca7") | ||
endif() | ||
set(CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP 1) | ||
else() | ||
cmake_policy(VERSION 3.28) | ||
endif() | ||
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# Default to C++ extensions being off. Libc++'s modules support have trouble | ||
# with extensions right now. | ||
set(CMAKE_CXX_EXTENSIONS OFF) | ||
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# Propagates the CMake options to the modules. | ||
# | ||
# This uses the std module hard-coded since the std.compat module does not | ||
# depend on these flags. | ||
macro(compile_define_if_not condition def) | ||
if (NOT ${condition}) | ||
target_compile_definitions(std PRIVATE ${def}) | ||
endif() | ||
endmacro() | ||
macro(compile_define_if condition def) | ||
if (${condition}) | ||
target_compile_definitions(std PRIVATE ${def}) | ||
endif() | ||
endmacro() | ||
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### STD | ||
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add_library(std) | ||
target_sources(std | ||
PUBLIC FILE_SET cxx_modules TYPE CXX_MODULES FILES | ||
std.cppm | ||
) | ||
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target_include_directories(std SYSTEM PRIVATE @LIBCXX_CONFIGURED_INCLUDE_DIRS@) | ||
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if (NOT @LIBCXX_ENABLE_EXCEPTIONS@) | ||
target_compile_options(std PUBLIC -fno-exceptions) | ||
endif() | ||
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target_compile_options(std | ||
PUBLIC | ||
-nostdinc++ | ||
-Wno-reserved-module-identifier | ||
-Wno-reserved-user-defined-literal | ||
@LIBCXX_COMPILE_FLAGS@ | ||
) | ||
set_target_properties(std | ||
PROPERTIES | ||
OUTPUT_NAME "c++std" | ||
) | ||
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### STD.COMPAT | ||
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add_library(std.compat) | ||
target_sources(std.compat | ||
PUBLIC FILE_SET cxx_modules TYPE CXX_MODULES FILES | ||
std.compat.cppm | ||
) | ||
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target_include_directories(std.compat SYSTEM PRIVATE @LIBCXX_CONFIGURED_INCLUDE_DIRS@) | ||
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if (NOT @LIBCXX_ENABLE_EXCEPTIONS@) | ||
target_compile_options(std.compat PUBLIC -fno-exceptions) | ||
endif() | ||
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target_compile_options(std.compat | ||
PUBLIC | ||
-nostdinc++ | ||
-Wno-reserved-module-identifier | ||
-Wno-reserved-user-defined-literal | ||
-fmodule-file=std=${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/std.dir/std.pcm | ||
@LIBCXX_COMPILE_FLAGS@ | ||
) | ||
set_target_properties(std.compat | ||
PROPERTIES | ||
OUTPUT_NAME "c++std.compat" | ||
) | ||
add_dependencies(std.compat std) |