testsuite: Add test for dynamic linking of cmm-sources objects

Essentially just copying the existing CmmSources test but building with
`--enable-executable-dynamic`

cabal-testsuite/PackageTests/CmmSourcesDyn/cabal.out

@@ -0,0 +1,13 @@
+# cabal v2-run
+Resolving dependencies...
+Build profile: -w ghc-<GHCVER> -O1
+In order, the following will be built:
+ - cmmexperiment-0 (lib) (first run)
+ - cmmexperiment-0 (exe:demo) (first run)
+Configuring library for cmmexperiment-0..
+Preprocessing library for cmmexperiment-0..
+Building library for cmmexperiment-0..
+Configuring executable 'demo' for cmmexperiment-0..
+Warning: The package has an extraneous version range for a dependency on an internal library: cmmexperiment >=0 && ==0. This version range includes the current package but isn't needed as the current package's library will always be used.
+Preprocessing executable 'demo' for cmmexperiment-0..
+Building executable 'demo' for cmmexperiment-0..

cabal-testsuite/PackageTests/CmmSourcesDyn/cabal.project

@@ -0,0 +1,2 @@
+packages: .
+executable-dynamic: True

cabal-testsuite/PackageTests/CmmSourcesDyn/cabal.test.hs

@@ -0,0 +1,7 @@
+import Test.Cabal.Prelude
+
+main = cabalTest $ do
+    skipIfWindows
+    res <- cabal' "v2-run" ["demo"]
+    assertOutputContains "= Post common block elimination =" res
+    assertOutputContains "In Box we have 0x" res

cabal-testsuite/PackageTests/CmmSourcesDyn/cbits/HeapPrim.cmm

@@ -0,0 +1,6 @@
+#include "Cmm.h"
+
+aToMyWordzh (P_ clos)
+{
+    return (clos);
+}

cabal-testsuite/PackageTests/CmmSourcesDyn/cmmexperiment.cabal

@@ -0,0 +1,27 @@
+cabal-version: 3.0
+name: cmmexperiment
+version: 0
+build-type: Simple
+
+-- This code is extracted form ghc-heap
+-- Copyright (c) 2012-2013, Joachim Breitner
+-- (and probably -2020 GHC Team)
+-- Under BSD-3-Clause
+
+library 
+  default-language: Haskell2010
+  hs-source-dirs: src
+  build-depends: base
+  exposed-modules: Demo
+
+  cmm-sources: cbits/HeapPrim.cmm
+  if impl(ghc >=8.2)
+    cmm-options: -ddump-cmm-verbose
+  else
+    cmm-options: -ddump-cmm
+
+executable demo
+  default-language: Haskell2010
+  main-is: Main.hs
+  hs-source-dirs: demo
+  build-depends: base, cmmexperiment

cabal-testsuite/PackageTests/CmmSourcesDyn/demo/Main.hs

@@ -0,0 +1,2 @@
+module Main (main) where
+import Demo (main)

cabal-testsuite/PackageTests/CmmSourcesDyn/setup.out

@@ -0,0 +1,7 @@
+# Setup configure
+Configuring cmmexperiment-0...
+# Setup build
+Preprocessing library for cmmexperiment-0..
+Building library for cmmexperiment-0..
+Preprocessing executable 'demo' for cmmexperiment-0..
+Building executable 'demo' for cmmexperiment-0..

cabal-testsuite/PackageTests/CmmSourcesDyn/setup.test.hs

@@ -0,0 +1,7 @@
+import Test.Cabal.Prelude
+
+main = setupTest $ do
+    skipIf "ghc < 7.8" =<< ghcVersionIs (< mkVersion [7,8])
+    setup "configure" []
+    res <- setup' "build" []
+    assertOutputContains "= Post common block elimination =" res

cabal-testsuite/PackageTests/CmmSourcesDyn/src/Demo.hs

@@ -0,0 +1,37 @@
+{-# LANGUAGE CPP #-}
+{-# LANGUAGE ForeignFunctionInterface #-}
+{-# LANGUAGE GHCForeignImportPrim #-}
+{-# LANGUAGE MagicHash #-}
+{-# LANGUAGE UnliftedFFITypes #-}
+module Demo (main) where
+
+#include "MachDeps.h"
+
+import Data.Bits
+import GHC.Exts
+import Numeric (showHex)
+
+foreign import prim "aToMyWordzh" aToWord# :: Any -> Word#
+
+tAG_MASK :: Int
+tAG_MASK = (1 `shift` TAG_BITS) - 1
+
+data Box = Box Any
+
+instance Show Box where
+   showsPrec _ (Box a) rs =
+    -- unsafePerformIO (print "↓" >> pClosure a) `seq`
+    pad_out (showHex addr "") ++ (if tag>0 then "/" ++ show tag else "") ++ rs
+     where
+       ptr  = W# (aToWord# a)
+       tag  = ptr .&. fromIntegral tAG_MASK -- ((1 `shiftL` TAG_BITS) -1)
+       addr = ptr - tag
+       pad_out ls = '0':'x':ls
+
+asBox :: a -> Box
+asBox x = Box (unsafeCoerce# x)
+
+main :: IO ()
+main = do
+    let box = asBox "foobar"
+    putStrLn $ "In Box we have " ++ show box