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https://github.com/Kitware/CMake.git
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Ben Boeckel
386465bf83
C++ modules have two variants which are of importance to CMake:
- `CXX_MODULES`: interface modules (those using `export module M;`,
`export module M:part;`, or `module M:internal_part;`)
- `CXX_MODULE_HEADER_UNITS`: importable header units
Creating C++ modules or partitions are *not* supported in any other
source listing. This is because the source files must be installed (so
their scope matters), but not part of usage requirements (what it means
for a module source to be injected into a consumer is not clear at this
moment). Due to the way `FILE_SET` works with scopes, they are a perfect
fit as long as `INTERFACE` is not allowed (which it is not).
26 lines
799 B
CMake
26 lines
799 B
CMake
enable_language(CXX)
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set(info "")
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# See `Modules/Compiler/MSVC-CXX.cmake` for this. If there is explicitly no
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# default, the feature list is populated to be everything.
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if (DEFINED CMAKE_CXX_STANDARD_DEFAULT AND
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CMAKE_CXX_STANDARD_DEFAULT STREQUAL "")
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set(CMAKE_CXX_COMPILE_FEATURES "")
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endif ()
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# Detect if the environment forces a C++ standard, let the test selection know.
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set(forced_cxx_standard 0)
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if (CMAKE_CXX_FLAGS MATCHES "-std=")
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set(forced_cxx_standard 1)
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endif ()
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# Forward information about the C++ compile features.
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string(APPEND info "\
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set(CMAKE_CXX_COMPILE_FEATURES \"${CMAKE_CXX_COMPILE_FEATURES}\")
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set(CMAKE_MAKE_PROGRAM \"${CMAKE_MAKE_PROGRAM}\")
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set(forced_cxx_standard \"${forced_cxx_standard}\")
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")
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file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/info.cmake" "${info}")
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