This disables building dynamic libraries for GHC 9.4.x and before, when enableShared and
enableProfiledLibs are set to false. Currently this only disables dynamic linking of GHC
itself, but still creates dynamic libraries.
The hadrian-based GHC 9.6+ already disable building dynamic libraries via the no_dynamic_libs
transformer in this case.
The reason for this happening before was, that the default was assumed to be "v p dyn", of
which "p" was taken away when profiled libs were disabled. But this would unconditionally
enable the dyn way. Using the BUILD_PROF_LIBS flag in this case will let GHC's config.mk.in
script make the proper decisions about which GhcLibWays to build.
The reasoning given for disabling it is flawed: In most cases, sphinx
and its dependencies are already in the binary cache, since we only need
them as build tools—sphinx for the build platform is just the normal
pkgs.sphinx, since it doesn't care about targetPlatform.
We just need to disable it when the buildPlatform is also musl, so we
avoid pulling in sphinx in pkgsMusl.
This ports our infamous patch for `Cabal` which cheesily prevents an
output cycle for derivations that use separate bin outputs where
references caused by the `Paths_*` module can't be eliminated by the GHC
aarch64-darwin codegen backend.
See also
- the original issue #140774,
- the original patch for GHC 9.2 #216857
- the ported patch for GHC 9.4
f6f780f129
Co-authored-by: sternenseemann <sternenseemann@systemli.org>
