Re: [Distutils] Side by side debug/non-debug eggs

Jean-Paul Calderone wrote:

On Fri, 22 May 2009 11:33:54 -0400, "P.J. Eby" wrote:

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At 09:45 AM 5/22/2009 -0400, Jean-Paul Calderone wrote:

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Hello all,

Prior to eggs, if I wanted to have debug and non-debug versions of an extension module available, I could build and install the extension twice and the modules would happily co-exist, for example:

$ python setup.py build install ... $ python-dbg setup.py build install ... $ .../site-packages/twisted/python$ ls *.so _epoll_d.so _epoll.so $ .../site-packages/twisted/python$ If I then ran a debug build of Python, the debug extension would be loaded. When I ran a normal build of Python, the non-debug extension would be loaded. However, with eggs, each new egg completely replaces the last egg. There seems to be no possibility for side-by-side builds. Am I overlooking a feature of eggs or of setuptools?

Have you tried "setup.py develop"? This builds extensions in-place in the source tree and adds the source tree to sys.path.

Aware of it, but I haven't tried it. In this use, it sounds very similar to "setup.py build_ext -i", which also partially solves the problem. Unfortunately, some packages have their source laid out such that they cannot actually be used in-place, only after they've been installed.

A data point: I've been using "setup.py develop" with twisted for over a year now, and it works great for me -- definitely one of my favorite features of setuptools. I use it with an svn checkout of twisted so I can always use the latest -- especially nice with twisted because of its high quality management (trunk is almost never broken). That way I can easily track the latest version -- just do an svn update, no further installation required. When I want to try a vcs checkout of an immature package and its setup.py uses distutils instead of setuptools, I'll try changing its setup.py to use setuptools (usually a one or two line replacement of the import) and see if "setup.py develop" works, and it almost always does. Steve