On Tue, Jan 19, 2010 at 02:47:54PM +0000, Joe Orton wrote: > On Mon, Jan 18, 2010 at 11:10:34PM -0500, Toshio Kuratomi wrote: > > We have a few packages that need to build themselves from their sources > > twice. For instance, vim builds three times (a minimal version for /bin/vi, > > and two versions with more dependencies for /usr/bin/vim and > > /usr/bin/gvim). Working on the python3 Guidelines, it looks like we'll have > > some more with packages that build both python2 and python3 modules from > > source that undergoes an automated transformation as part of its build. > > > > So there's approaches to doing this: > > > > 1) Copy the source tree and build in both places > > 2) Build once with the python2 interpreter, copy the results away, and then > > build a second time with python3. > > > > vim takes a C version of option #2 (build with one set of configure options, > > copy the results; make clean; and build with another set of options) but I'm > > not sure there's a reason for that. It uses less disk space as we don't > > have to duplicate the source tree. However, in software that might pollute > > its source tree when it builds (maybe substituting file paths directly into > > a source file, for instance), this could break. > > > > Are there other reasons than I see for doing #2? > > You should never be running "make clean" and rebuilding an existing > source tree to produce a differently-configured binary, this will break > debuginfo generation. > > Most projects should allow use to use "VPATH" builds where > srcdir!=builddir, if not it is generally pretty simple to fix up the > Makefiles to support this. Generally you'll do: > > mkdir build-one && cd build-one > ../configure --some-options > make > cd .. > mkdir build-two && cd build-two > ../configure --other-options > etc > <nod> Projects built using automake should understand VPATH. I'm not sure if python extension modules (built with distutils) would but copying the source should work there if VPATH doesn't. It sounds like C apps that currently do #2 should be switched over to either VPATH or copying the source directory as well. -Toshio
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