[CMake] file(DOWNLOAD ...) at build time

[Luc J. Bourhis]

David Cole-2 wrote
> The simplest way is to make a “download only” ExternalProject, by using
> something like:
> [...]
> ExternalProject does all that for you, and even extracts tarballs and
> moves them into the SOURCE_DIR for you, which you can see if you poke
> around enough underneath the hood.

The problem is that the file to download is a RPM and ExternalProject does
not know how to handle it.


David Cole-2 wrote
> Alternatively, you could use add_custom_command to run a CMake script at
> build time that does the file(DOWNLOAD.
> 
>     add_custom_command(COMMAND ${CMAKE_COMMAND} -P
> 
>       ${CMAKE_CURRENT_SOURCE_DIR}/download.cmake)
> 
> And then in download.cmake:
> 
>     file(DOWNLOAD .....)

As far as I understand, ExternalProject_Add creates the equivalent of
download.cmake and then use the -P trick. Would there be a way to put the
download.cmake inline the calling CMake script? Like a "heredoc"?

Thanks,




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Luc J. Bourhis

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