[Scons-users] download builder - tips

[William Deegan]

Philk
On Apr 6, 2013, at 2:43 PM, Philipp Kraus <philipp.kraus at flashpixx.de> wrote:


> On 2013-04-06 02:41:22 +0200, Philipp Kraus said:

> 

>> thanks to Dirk and Bill for some nice email. I would like to replace my "dirty hacked Scons script" to a little more general code structure and would like to send them into the Scons community.

>> I'm primary writing C/C++ code and uses Scons on OSX, Linux, Windows (MSVC & MinGW) for the building process.

>> Often there exists on my C/C++ project the problem, that the project uses a lot of different libraries eg LAPack, Boost, Dune-FEM .... and these libs must be compiled for the project, so I use Scons for

>> this building process most with a lot of env.Command code and some hacked builders. With a little time, I have forked out my first "hacked builder" to a more "Scons-Way-Builder".

>> It is a little short builder, which downloads any URL data into a file. I have pushed the builder in my repo ( https://github.com/flashpixx/Storage/blob/master/Scons/site_scons/site_tools/URLDownload.py )

>> and a test Sconstruct under https://github.com/flashpixx/Storage/blob/master/Scons/SConstruct

>> This builder replaces the target on default with the filename of the URL, the env setting URLDOWNLOAD_USEURLFILENAME (true | false) can be enabled / disabled this target replacing

>> The next forked builders will be an Unpacking builder with flexible tool use (eg 7-Zip under Windows, tar / gzip / bzip under *nix) and a external builder for compiling extracted sources with cmake, MSVC ...

> 

> I need a little help, because I get on my builders a cyclic dependency on cleaning or on the second run. If I have got a "clean" directory, everything works fine, the download builder creates

> the downloaded file and my unpack builder ( https://github.com/flashpixx/Storage/blob/master/Scons/site_scons/site_tools/Unpack.py ) is run and creates the correct extracting file list.

> If I run after the first run, without cleaning the builder script again, I get an error of the unpack builder that there exists a cyclic depency, an equal error is shown up, if I run "scons -c".

> 

> If I replace in the Unpack.py the line 280 (     return target, source ) to  'return "test", source' the error does not occure, so imho the problem exists in the emitter. The unpack builder returns a list of files & directories in an archive and the download builder get the file. So I hope, that I can download, extract and compile the sources in one short step. (The unpack builder works at the moment with *nix systems, Windows calls are not implementated yet)


Can you paste the output you're getting and any more information?
Also what would be great is either a simple SConstruct which demonstrates the issue, or a zip file with minimal amount of files/logic which demonstrates the issue.

The more info, the easier it is to help you!

-Bill