14 lines
992 B
Markdown
14 lines
992 B
Markdown
# Downloading Projects
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## Downloading Method: build time
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Until CMake 3.11, the primary download method for packages was done at build time. This causes several issues; most important of which is that `add_subdirectory` doesn't work on a file that doesn't exist yet! The built-in tool for this, ExternalProject, has to work around this by doing the build itself. (It can, however, build non-CMake packages as well).[^1]
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[^1]: Note that ExternalData is the tool for non-package data.
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## Downloading Method: configure time
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If you prefer configure time, see the [Crascit/DownloadProject](https://github.com/Crascit/DownloadProject) repository for a drop-in solution. Submodules work so well, though, that I've discontinued most of the downloads for things like GoogleTest and moved them to submodules. Auto downloads are harder to mimic if you
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don't have internet access, and they are often implemented in the build directory, wasting time and space if you have multiple build directories.
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