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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
17 lines
528 B
CMake
17 lines
528 B
CMake
# We're providing a pre-existing source directory. Make sure we don't trigger
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# an error if the undocumented but used-in-the-wild CMAKE_DISABLE_SOURCE_CHANGES
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# variable is set.
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set(CMAKE_DISABLE_SOURCE_CHANGES TRUE)
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include(ExternalProject)
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ExternalProject_Add(source_dir_existing
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SOURCE_DIR "${CMAKE_CURRENT_LIST_DIR}/Foo"
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DOWNLOAD_COMMAND "${CMAKE_COMMAND}" -E echo "Download command executed"
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UPDATE_COMMAND ""
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CONFIGURE_COMMAND ""
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BUILD_COMMAND ""
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TEST_COMMAND ""
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INSTALL_COMMAND ""
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)
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