These commands file(DOWNLOAD "http://download.gnome.org/sources/glib/2.32/glib-2.32.1.tar.xz" "/home/software/plplot_svn/HEAD/plplot_allura/cmake/build_projects/cmake_downloaded_glib-2.32.1.tar.xz" SHOW_PROGRESS STATUS status) message(STATUS "Download status = ${status}")
instantly give me the following results: -- [download 0% complete] -- Download status = 1;"unsupported protocol" with a zero-length cmake_downloaded_glib-2.32.1.tar.xz produced. Yet when I use wget to obtain http://download.gnome.org/sources/glib/2.32/glib-2.32.1.tar.xz there are no problems. i.e., software@raven> wget http://download.gnome.org/sources/glib/2.32/glib-2.32.1.tar.xz --2013-07-11 16:04:21-- http://download.gnome.org/sources/glib/2.32/glib-2.32.1.tar.xz Resolving download.gnome.org (download.gnome.org)... 209.132.180.168, 209.132.180.180 Connecting to download.gnome.org (download.gnome.org)|209.132.180.168|:80... connected. HTTP request sent, awaiting response... 302 Found Location: https://download.gnome.org/sources/glib/2.32/glib-2.32.1.tar.xz [following] --2013-07-11 16:04:21-- https://download.gnome.org/sources/glib/2.32/glib-2.32.1.tar.xz Connecting to download.gnome.org (download.gnome.org)|209.132.180.168|:443... connected. HTTP request sent, awaiting response... 301 Moved Permanently Location: http://ftp.gnome.org/pub/GNOME/sources/glib/2.32/glib-2.32.1.tar.xz [following] --2013-07-11 16:04:22-- http://ftp.gnome.org/pub/GNOME/sources/glib/2.32/glib-2.32.1.tar.xz Resolving ftp.gnome.org (ftp.gnome.org)... 130.239.18.137, 130.239.18.138, 130.239.18.163, ... Connecting to ftp.gnome.org (ftp.gnome.org)|130.239.18.137|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 6138200 (5.9M) [application/x-xz] Saving to: `glib-2.32.1.tar.xz.1' 100%[===========================================================================>] 6,138,200 956K/s in 12s 2013-07-11 16:04:35 (508 KB/s) - `glib-2.32.1.tar.xz.1' saved [6138200/6138200] If I do the equivalent CMake commands above for some random *.tar.gz the result was -- [download 25% complete] -- [download 100% complete] -- Download status = 0;"no error" with a full file downloaded. So I don't think I have any syntax error in the above CMake logic. One explanation is CMake might be having trouble with the http protocol when there is a tar.xz suffix on the URL. To check that hypothesis, I also tried downloading http://download.gnome.org/sources/gcr/3.4/gcr-3.4.1.tar.xz and got the same bad status. But why should CMake care in the slightest about the tar.xz suffix on the file that is downloaded? Shouldn't it just download the file come hell or high water? BTW, I also just discovered that cmake has no trouble unpacking a *.tar.xz file using, e.g., cmake -E tar xfz glib-2.32.1.tar.xz I also found that some small changes had to be made to ExternalProjects.cmake to allow files of the form *.tar.xz to be processed further (e.g., by the above cmake -E tar command). I plan to submit that patch to your bug tracker. But aside from that one issue (fixed with a patch) and the above strange issue with *.tar.xz files that cannot be downloaded with file(DOWNLOAD), the rest of my use of ExternalProject.cmake should be okay for build_projects (where I have discovered that many downloadable source tarballs are in the *.tar.xz form). Alan __________________________ Alan W. Irwin Astronomical research affiliation with Department of Physics and Astronomy, University of Victoria (astrowww.phys.uvic.ca). Programming affiliations with the FreeEOS equation-of-state implementation for stellar interiors (freeeos.sf.net); the Time Ephemerides project (timeephem.sf.net); PLplot scientific plotting software package (plplot.sf.net); the libLASi project (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project (lbproject.sf.net). __________________________ Linux-powered Science __________________________ -- Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Follow this link to subscribe/unsubscribe: http://public.kitware.com/cgi-bin/mailman/listinfo/cmake-developers