Implement `MIN_VERSION_GLASGOW_HASKELL()` macro

This exposes the `cProjectPatchLevel{1,2}` value at the CPP level to
allow it to be used in CPP conditionals. Concretely, GHC 7.10.2.20150623
would result in

  #define __GLASGOW_HASKELL__             710
  #define __GLASGOW_HASKELL_PATCHLEVEL1__ 2
  #define __GLASGOW_HASKELL_PATCHLEVEL2__ 20150623

while GHC 7.10.3 results in

  #define __GLASGOW_HASKELL__             710
  #define __GLASGOW_HASKELL_PATCHLEVEL1__ 3

and finally GHC 7.9.20141009 results in

  #define __GLASGOW_HASKELL__             709
  #define __GLASGOW_HASKELL_PATCHLEVEL1__ 20141009

As it's error-prone to properly express CPP conditionals for testing GHC
multi-component versions, a new macro `MIN_VERSION_GLASGOW_HASKELL()` is
provided (also via the new CPP include file `ghcversion.h`)

Finally, in order to make it easier to define the new CPP macro
`MIN_VERSION_GLASGOW_HASKELL()`, a new default-included
`include/ghcversion.h` is used for the new CPP definitions.

Reviewed By: ekmett, austin, #ghc

Differential Revision: https://phabricator.haskell.org/D66

1 files changed, 2 insertions, 0 deletions

diff --git a/mk/project.mk.in b/mk/project.mk.in
index 69ed88575e..129b540c88 100644
--- a/mk/project.mk.in
+++ b/mk/project.mk.in
@@ -29,6 +29,8 @@ ProjectTags       =
 ProjectVersion    = @ProjectVersion@$(ProjectTags)
 ProjectVersionInt = @ProjectVersionInt@
 ProjectPatchLevel = @ProjectPatchLevel@
+ProjectPatchLevel1 = @ProjectPatchLevel1@
+ProjectPatchLevel2 = @ProjectPatchLevel2@
 
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