GitLab

This means that -static now disables the -fPIC that we're currently
getting by default.

Even though e.g. inplace/bin/hpc doesn't normally need a shell wrapper,
it does when we are using dynlibs, as we need to set the
LD_LIBRARY_PATH so that it can find its libraries.

We were making an aggressive assumption that foreign calls cannot
clobber heap or stack memory, which for the majority of foreign calls
is true, but we violate the assumption in the implementation of
primops in the RTS.  This was causing crashes in some STM tests.

This makes it easier to be confident that the optimisation gives the
right answer.

Adds better support for constant folding of Float/Double literals.
  - add rationalToFloat, rationalToDouble with associated Name/Id's in PrelNames.
  - add a matching rule in PrelRules for rationalTo* functions.

This will hopefully make it less likely that we will get bug reports
with the pretty output, such as in trac ticket 7225.

As well as the rules mentioned in the ticket, I've also gone through
and added some more rules that might be useful in other cases.

This fixes using TH when building profiled libraries when
dynamic-by-default is enabled.

Except for CgUtils.fixStgRegisters that is used in the NCG and LLVM
backends, and should probably be moved somewhere else.

It sets GhcLibWays=v, which doesn't work with DYNAMIC_BY_DEFAULT on
as the dynamic libs aren't built.

We were being inconsistent about how we tested whether dump flags
were enabled; in particular, sometimes we also checked the verbosity,
and sometimes we didn't.

This lead to oddities such as "ghc -v4" printing an "Asm code" section
which didn't contain any code, and "-v4" enabled some parts of
"-ddump-deriv" but not others.

Now all the tests use dopt, which also takes the verbosity into account
as appropriate.

Mostly d -> g (matching DynFlag -> GeneralFlag).
Also renamed if* to when*, matching the Haskell if/when names

This avoids confusion due to [DynFlag] and DynFlags being completely
different types.