[Fink-devel] CPATH / LIBRARY_PATH

[Max Horn]

Yo folks,


as Jean-Francois Mertens suggested in the past, maybe we should now consider a change in our approach on how to get stuff to link against Fink libs & to use /sw/include header file.


Right now, fink by default sets CPPFLAGS to -I/sw/include and LDFLAGS to -L/sw/lib by default for every package (unless explicitly disabled). This works in most cases, but at always, that's why in various package we have to use NoSetCPPFLAGS etc. and use tricks to achieve the right behaviour.

Recently this has turned up again becaus both cyrus-sasl and libmd install(ed) a /sw/include/md5.h file. Now when building dpkg, which also has a md5.h header file in its sources, dpkg would use the /sw/include/md5.h file, not its own - which of course breaks the build.

The reason being that with our default approach, headers are always first searched in the Fink include directoy.


jfm suggested as an alternative to set CPATH and LIBRARY_PATH to appropriate value (and also DYLD_FALLBACK_LIBRARY_PATH, though I am not quite sure why it would be needed - can you give me an example scenario where it might be beneficial to have that?).

The first idea was to modify base-files (init.sh and init.csh in particular) to do that, but now that we are using a clean build environment, that is not going to work, and in fact not necessary. Rather, we could simply modify fink to set it at the start of each build (in particular, in PkgVersion.pm the set_env() method would do it). Of course, we'd also provide NoSetCPATH and NoSet LIBRARY_PATH fields.


What do you people think? My suggestion would be to try that ASAP. I could disable the default values of CPPFLAGS/LDFLAGS and instead give default values to CPATH/LIBRARY_PATH. That's 5 minutes to change it (and also 5 minutes to back it out if it works badly :-). The major issue with this is that we should basically recompile *every single package*. I don't see why it should break anything, but you never know for sure. On the positive side, it should allow us to get rid of various fixes/patches, and also should prevent certain typical problems from cropping up in the future.


Your feedback is welcome :-)

Max
--
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Max Horn
Software Developer

email: <mailto:max@;quendi.de>
phone: (+49) 6151-494890


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