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0cc1b550dd
The file(MAKE_DIRECTORY) implementation checks whether a path is allowed to be written to before it checks if it already exists. For the scenario where a SOURCE_DIR is an existing directory within the main project's source directory, this triggers a fatal error if CMAKE_DISABLE_SOURCE_CHANGES is set to true for ExternalProject, and some FetchContent scenarios. Therefore, add an explicit check for existence first to avoid making such error-triggering calls. Fixes: #21872
19 lines
758 B
CMake
19 lines
758 B
CMake
cmake_policy(SET CMP0168 NEW)
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# Undocumented variable used to catch attempts to write to anywhere under the
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# source directory that isn't under the build directory. In order for this
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# code path to be checked for direct population mode, we need a non-empty
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# download, update, or patch command so that the population code path is used.
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# Custom commands might not write to the source directory and instead just
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# print messages or other non-modifying tasks, like is done here.
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set(CMAKE_DISABLE_SOURCE_CHANGES TRUE)
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include(FetchContent)
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FetchContent_Declare(
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WithProject
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SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/WithProject # This exists
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DOWNLOAD_COMMAND ${CMAKE_COMMAND} -E echo "Download command executed"
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)
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FetchContent_MakeAvailable(WithProject)
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