* Restructure Includes3 tests so that I can also test Hackage case.

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

* Compute correct install directories for instantiated Backpack components

Previously, we would compute elabInstallDirs once when configuring a
component, and then reuse the exactly same install directories for
every instantiation of the package.  But this is wrong, since we're
installing the header/object files for each instantiation to a different
directory.  We refactor install directory computation into a helper
function and then call it again at instantiation time to refresh
the install directories.

For some reason, this bug ONLY manifests for packages installed from
Hackage; it seems install dirs are not respected for inplace packages.

Fixes #6005

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

* Test fix

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

* Copy backpack version-guard from other backpack testcases

Herbert Valerio Riedel authored 7 years ago and Oleg Grenrus committed 7 years ago

This provides a provisional (i.e. hacky) retrofitted implementation of
the forward-compat scheme described in #4899 for the cabal-2.2 branch

This hack works by constructing a dummy package description in case
the package description fails to be parsed via the standard parser,
and we detect a new-style cabal-spec declaration.

Edward Z. Yang authored 8 years ago and Edward Z. Yang committed 8 years ago

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Edward Z. Yang authored 8 years ago and Edward Z. Yang committed 8 years ago

The key idea is that once we put PackageTests in its own package, we can
ensure that its Setup.hs is compiled with the same version of Cabal
library as package-tests is compiled with.  This means that LBI reading
will *always succeed* which is quite nice.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>