hadrian: Add +boot_nonmoving_gc flavour transformer

For using GHC bootstrapping to validate the non-moving GC.

(cherry picked from commit ec382ccc087015db3d8782d3079c757ef8f10e9b)

1 files changed, 8 insertions, 0 deletions

diff --git a/hadrian/src/Flavour.hs b/hadrian/src/Flavour.hs
index af712dd7c5..54f4c92526 100644
--- a/hadrian/src/Flavour.hs
+++ b/hadrian/src/Flavour.hs
@@ -51,6 +51,7 @@ flavourTransformers = M.fromList
     , "collect_timings" =: collectTimings
     , "assertions" =: enableAssertions
     , "haddock" =: enableHaddock
+    , "boot_nonmoving_gc" =: enableBootNonmovingGc
     ]
   where (=:) = (,)
 
@@ -229,6 +230,13 @@ enableLateCCS =
 enableAssertions :: Flavour -> Flavour
 enableAssertions flav = flav { ghcDebugAssertions = True }
 
+-- | Build the stage3 compiler using the non-moving GC.
+enableBootNonmovingGc :: Flavour -> Flavour
+enableBootNonmovingGc = addArgs $ mconcat
+    [ stage Stage2 ? builder Ghc
+      ? pure ["+RTS", "--nonmoving-gc", "-RTS"]
+    ]
+
 -- | Produce fully statically-linked executables and build libraries suitable
 -- for static linking.
 fullyStatic :: Flavour -> Flavour