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Fix underlinking on ghc-prim.
Fixes ghc-stage2 crahs on hardened toolchain.
Reported-by: aranea
diff --git a/libraries/ghc-prim/ghc-prim.cabal b/libraries/ghc-prim/ghc-prim.cabal
index ffb32af..0431380 100644
--- a/libraries/ghc-prim/ghc-prim.cabal
+++ b/libraries/ghc-prim/ghc-prim.cabal
@@ -68,0 +68,4 @@ Library
+
+    -- ghc 'sin' (and other) primops generate 'libm' calls,
+    -- but ghc itself does not add '-lm'
+    extra-libraries: m