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

[David Cole]

The simplest way is to make a “download only” ExternalProject, by using something like:

 

    ExternalProject_Add(proj

      DOWNLOAD_DIR ${CMAKE_CURRENT_BINARY_DIR}/downloads

      URL http://...

      URL_MD5 31267132687126...

      CONFIGURE_COMMAND “”

      BUILD_COMMAND “”

      INSTALL_COMMAND “”

    )

 

 

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 .....)

 

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.

 

 

HTH,

David

 


From: Luc J. Bourhis
Sent: ‎March‎ ‎11‎, ‎2013 ‎12‎:‎00‎ ‎PM
To: cmake at cmake.org
Subject: [CMake] file(DOWNLOAD ...) at build time


Is there a simple pattern to make file(DOWNLOAD ...) do the actual
downloading at build time? I tried to understand how ExternalProject_Add
does it but to no avail.




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Luc J. Bourhis

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