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ed1273d4dd
This PR addresses a problem that headers may not be able to be found if
`#include` is used with std modules.
Consider the following file:
#include <boost/json.hpp>
import std;
int main(int, const char **) { }
Boost will include something from libc++, but we are using -nostdinc++
at [1] so the compiler can not find any default std header. Therefore
the locally built header needs to be public.
[1]: 15fdd47c4b/libcxx/modules/CMakeLists.txt.in (L52)
97 lines
2.4 KiB
CMake
97 lines
2.4 KiB
CMake
cmake_minimum_required(VERSION 3.26)
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project(libc++-modules LANGUAGES CXX)
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# Enable CMake's module support
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if(CMAKE_VERSION VERSION_LESS "3.28.0")
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if(CMAKE_VERSION VERSION_LESS "3.27.0")
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set(CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API "2182bf5c-ef0d-489a-91da-49dbc3090d2a")
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else()
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set(CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API "aa1f7df0-828a-4fcd-9afc-2dc80491aca7")
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endif()
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set(CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP 1)
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else()
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cmake_policy(VERSION 3.28)
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endif()
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# Default to C++ extensions being off. Libc++'s modules support have trouble
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# with extensions right now.
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set(CMAKE_CXX_EXTENSIONS OFF)
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# Propagates the CMake options to the modules.
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#
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# This uses the std module hard-coded since the std.compat module does not
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# depend on these flags.
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macro(compile_define_if_not condition def)
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if (NOT ${condition})
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target_compile_definitions(std PRIVATE ${def})
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endif()
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endmacro()
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macro(compile_define_if condition def)
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if (${condition})
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target_compile_definitions(std PRIVATE ${def})
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endif()
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endmacro()
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### STD
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add_library(std)
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target_sources(std
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PUBLIC FILE_SET cxx_modules TYPE CXX_MODULES FILES
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std.cppm
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)
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target_include_directories(std SYSTEM PUBLIC @LIBCXX_CONFIGURED_INCLUDE_DIRS@)
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if (NOT @LIBCXX_ENABLE_EXCEPTIONS@)
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target_compile_options(std PUBLIC -fno-exceptions)
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endif()
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target_compile_options(std
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PUBLIC
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-nostdinc++
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@LIBCXX_COMPILE_FLAGS@
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)
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target_compile_options(std
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PRIVATE
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-Wno-reserved-module-identifier
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-Wno-reserved-user-defined-literal
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)
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target_link_options(std PUBLIC -nostdlib++ -Wl,-rpath,@LIBCXX_LIBRARY_DIR@ -L@LIBCXX_LIBRARY_DIR@)
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target_link_libraries(std c++)
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set_target_properties(std
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PROPERTIES
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OUTPUT_NAME "c++std"
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)
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### STD.COMPAT
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add_library(std.compat)
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target_sources(std.compat
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PUBLIC FILE_SET cxx_modules TYPE CXX_MODULES FILES
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std.compat.cppm
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)
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target_include_directories(std.compat SYSTEM PUBLIC @LIBCXX_CONFIGURED_INCLUDE_DIRS@)
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if (NOT @LIBCXX_ENABLE_EXCEPTIONS@)
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target_compile_options(std.compat PUBLIC -fno-exceptions)
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endif()
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target_compile_options(std.compat
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PUBLIC
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-nostdinc++
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@LIBCXX_COMPILE_FLAGS@
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)
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target_compile_options(std.compat
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PRIVATE
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-Wno-reserved-module-identifier
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-Wno-reserved-user-defined-literal
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)
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set_target_properties(std.compat
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PROPERTIES
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OUTPUT_NAME "c++std.compat"
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)
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add_dependencies(std.compat std)
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target_link_libraries(std.compat PUBLIC std c++)
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