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, 1 insertions, 0 deletions

diff --git a/ghc.mk b/ghc.mk
index eedb023c6e..b75049fb19 100644
--- a/ghc.mk
+++ b/ghc.mk
@@ -1223,6 +1223,7 @@ CLEAN_FILES += includes/GHCConstants.h
 CLEAN_FILES += includes/DerivedConstants.h
 CLEAN_FILES += includes/ghcautoconf.h
 CLEAN_FILES += includes/ghcplatform.h
+CLEAN_FILES += includes/ghcversion.h
 CLEAN_FILES += utils/ghc-pkg/Version.hs
 CLEAN_FILES += compiler/parser/Parser.y
 CLEAN_FILES += compiler/prelude/primops.txt