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Under CMP0155's NEW behavior, projects that explicitly enable C++20 support with `set(CMAKE_CXX_STANDARD 20)` may also explicitly disable scanning with `set(CMAKE_CXX_SCAN_FOR_MODULES OFF)`. We already propagate `CMAKE_CXX_STANDARD` into `try_compile` test projects, so propagate `CMAKE_CXX_SCAN_FOR_MODULES` too. Fixes: #25313
22 lines
730 B
CMake
22 lines
730 B
CMake
# Enable scanning by default for targets that explicitly use C++ 20.
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cmake_policy(SET CMP0155 NEW)
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enable_language(CXX)
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# Hide any real scanning rule that may be available.
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unset(CMAKE_CXX_SCANDEP_SOURCE)
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# Explicitly enable C++20 for all targets.
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set(CMAKE_CXX_STANDARD 20)
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set(CMAKE_CXX_STANDARD_REQUIRED ON)
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# Explicitly suppress scanning so that support is not required.
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set(CMAKE_CXX_SCAN_FOR_MODULES OFF)
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add_executable(noscanning-variable main-no-use.cxx)
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# Verify that CMAKE_CXX_SCAN_FOR_MODULES is propagated into the check.
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# FIXME: Unset CMAKE_CXX_SCANDEP_SOURCE inside try_compile so this
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# test can verify behavior on newer compilers too.
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try_compile(result SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/main-no-use.cxx)
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