Switches from the forking service type to simple by running haveged in
the foreground. Also restricts the execution environment a bit (these
are inspired by the Debian service file).
It's my understanding that Emacs runs the "structured-haskell-mode" binary
virtually every time you press a key in an Haskell buffer, and since
dynamically linked Haskell binaries take *much* longer to start up, switching
this particular package to statically linked libraries ought to result in a
performance boost.
These changes are needed to be able to run the system emulator (QEMU)
from Android Studio. In addition to the added dependencies,
$LD_LIBRARY_PATH had to be changed from --set to --prefix, so that libGL
is found (on NixOS).
The opam package manager relies on external solvers to determine package
management decisions it makes related to upgrades, new installations,
etc.
While, strictly speaking, an external solver is optional, aspcud is
highly recommended in documentation. Furthermore, even having a
relatively small number of packages installed quickly causes the limits
of the interal solver to be reached (before it times out).
Aspcud itself depends on two programs from the same suite: gringo, and
clasp.
On Darwin, Boost 1.55 (and thus Gringo) do not build, so we only support
Aspcud on non-Darwin platforms.
1) add pcre dependency (for some reason builtin_pcre doesn't work)
2) Disable dependencies that are currently not supported by the
expression. Most users should not need those. These are disabled to
prevent cmake from picking them up from system and causing impurities.
Once there is a user who needs these they will have to update the
expression.
3) disable some OSX detection code that relies on /usr/bin/sw_vers
that chooses c++ library, silences warnings and sets macosx-version-min.
macosx-version-min is already set by nix using MACOSX_DEPLOYMENT_TARGET
environment variable.
