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If anyone wants to do this in the future, they should just set
appropriate CC_OPTS/LD_OPTS variables instead.

Patch modified from one by Karel Gardas <karel.gardas@centrum.cz>.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

Clang gives a big fat warning that there's no return value for the
statement, since the prototype defaults to 'int'.
Signed-off-by: Austin Seipp <aseipp@pobox.com>

Signed-off-by: Austin Seipp <aseipp@pobox.com>

document them.

Signed-off-by: David Terei <davidterei@gmail.com>

Submitted by: Stephen Paul Weber <singpolyma@singpolyma.net>

We have two cases:
 1. building a cross-compiler
 2. compiling GHC to run on a foreign platform

These two are done with almost the same setup: (1) is the stage 1
compiler, and (2) is the stage 2 compiler, when CrossCompiling=YES.

The only difference between (1) and (2) is that you if you set up the
build for (1), then it stops before stage 2 and you can 'make install'
to install stage 1.

Unfortunately, (2) didn't work, and the build system code needed some
tidying up.

Change to the way the build is set up:

Before
------

To build a cross-compiler:
  ./configure --target=<..>

To compile a foreign GHC:
  ./configure --host=<..> --target=<..>

Now
---

To build a cross-compiler:
  ./configure --target=<..>
  And set "Stage1Only=YES" in mk/build.mk

To compile a foreign GHC:
  ./configure --target=<..>

$GCC is empty when autoreconf 2.56 or 2.59 is used, although it works
with 2.67. If testing $GCC with 2.5* worked in the past then I'm not
sure when/why it broke.

If we are cross-compiling, we assume that if timer_create exists then
it works.

All supported bootstrapping compilers now have --info output,
so we can use that unconditionally.

This reverts the compiler parts of

    commit 7b594a5d
    Author: David Terei <davidterei@gmail.com>
    Date:   Mon Nov 21 12:05:18 2011 -0800

    Remove registerised code for dead architectures: mips, ia64, alpha,
    hppa1, m68k

In particular, we want to know whether bewareLoadStoreAlignment should
return True or False for them.

It also reverts

    commit 3fc68b5c
    Author: Simon Marlow <marlowsd@gmail.com>
    Date:   Wed Jan 4 11:44:02 2012 +0000

    Remove missing archs (mipseb, mipsel, alpha) (#5734)

    It doesn't hurt to map these to ArchUnknown since we don't need to
    know anything specific about them, and adding them would be a pain
    (there are a bunch of places where we have to case-match on all the
    arches to avoid warnings).

They were getting baked into Config.hs before.

We now normalise their paths, so that native Windows paths rather than
cygwin paths. This means that we are able to execute them from Cabal
or python.

I've also abstracted out the normalisation code into an m4 function.

Rename package database flags in both GHC and ghc-pkg so that they are
consistent with Cabal nomenclature.

Add a version check to the build system so that the correct set of
package db flags are used when the bootstrapping GHC has version < 7.5.

This patch enhances Platform's ArchARM to include ARM ABI value. It also
tweaks configure machinery to detect hard-float ABI and to set it wherever
needed. Finally when hard-float ABI is in use, pass appropriate compiler
option to the LLVM's llc. Fixes #5914.