If we build two things in one derivation, it becomes more complicated
and its build time is extended. Therefore we should avoid this if
possible. There's a good opportunity for this with boost: We have
boost-build packaged already. This has the additional benefit that
we can get rid of $CC_FOR_BUILD entirely in boost, meaning we don't
need to rely on (as many) hacks to make boost understand our way of
cross compiling.
Unfortunately boost-build is not backwards compatible, so we need to
build a specific boost-build for each boost derivation (the number
could probably be reduced, but I'm not interested in testing a lot
of boost builds at the moment).
Additionally we fix a few cross compilation problems:
- boost couldn't cope with different types of compilers for native
and cross (as happens if useLLVM is true). Since we only use one
of them per derivation, this is no longer an issue.
- boost didn't find the cross ar and ranlib for compilation (since
it doesn't check $AR or $RANLIB). Instead it used plain ar and
ranlib form $PATH which were the native ones before. This is now
fixed by setting these tools explicitly in user-config.jam (and
no longer providing the native tools).
With these changes, pkgsLLVM.boost builds.
On darwin, instead of patching the clang-darwin.jam definition, we
instead supply -rpath $out/lib via <linkflags> which causes the
correct directory to be added to the libraries' rpaths, so that
they find each other.
d20aa4955d