[gobolinux-devel] Use-flags / Dependencies

[David Karell]

Hello fellow GoboLinux users/developers!

This is the first time I write to this list, some of you've seen me on
irc.

First of all, use-flags is a really nice feature which hopefully will
become more and more integrated into the system.
I've identified an issue,  however.

Perhaps I want to compile this great package X, which depends on library
Y. The problem is that X will only compile/link properly if library Y was
built with a specific use-flag.

A real-life example is centerim, a ncurses icq/msn/yahoo/...--client. It
needs libcurl, but in addition libcurl must've been built with
ssl-support. "Luckily", the configure-phase will fail when it detects
that there's no ssl-support in libcurl, but this may not always be true
for other programs.

Sometimes, the program would compile but with reduced functionality
(configure-phase won't really stop).

It'd be good with a "was_this_other_package_Y_built_with_use_flag_xxx"
directive in recipes, and then take some action, for instance, print a
more userfriendly message, explaining to the user what to do.

I don't think we'd like to recompile other packages with additional
use-flags automatically, though it could be done to resolve such
problems. Anyway, there may be other uses for such a directive that takes
some action depending on another package's useflags.

Best Regards
/David Karell

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