Use --io-manager=native in lib-suite on Windows

cabal-testsuite/cabal-testsuite.cabal

@@ -92,6 +92,8 @@ executable cabal-tests
   main-is: cabal-tests.hs
   hs-source-dirs: main
   ghc-options: -threaded
+  if os(windows)
+    ghc-options: -rtsopts
   -- Make sure these are built before the executable is run
   build-tool-depends: cabal-testsuite:test-runtime-deps
   build-depends:

validate.sh

@@ -324,6 +324,8 @@ CABAL_TESTSUITE_BDIR="$(pwd)/$BUILDDIR/build/$ARCH/$BASEHC/cabal-testsuite-3"
 CABALNEWBUILD="${CABAL} build $JOBS -w $HC --builddir=$BUILDDIR --project-file=$PROJECTFILE"
 CABALLISTBIN="${CABAL} list-bin --builddir=$BUILDDIR --project-file=$PROJECTFILE"
 
+RTSOPTS="$([[ $ARCH = "x86_64-windows" ]] && echo "+RTS --io-manager=native" || echo "")"
+
 # header
 #######################################################################
 
@@ -344,6 +346,7 @@ doctest:             $DOCTEST
 benchmarks:          $BENCHMARKS
 verbose:             $VERBOSE
 extra compilers:     $EXTRAHCS
+extra RTS options:   $RTSOPTS
 
 EOF
 }
@@ -426,7 +429,7 @@ fi
 step_lib_suite() {
 print_header "Cabal: cabal-testsuite"
 
-CMD="$($CABALLISTBIN cabal-testsuite:exe:cabal-tests) --builddir=$CABAL_TESTSUITE_BDIR $TESTSUITEJOBS --with-ghc=$HC --hide-successes"
+CMD="$($CABALLISTBIN cabal-testsuite:exe:cabal-tests) --builddir=$CABAL_TESTSUITE_BDIR $TESTSUITEJOBS --with-ghc=$HC --hide-successes $RTSOPTS"
 (cd cabal-testsuite && timed $CMD) || exit 1
 }
 
@@ -468,7 +471,7 @@ CMD="$($CABALLISTBIN cabal-install:test:integration-tests2) -j1 --hide-successes
 step_cli_suite() {
 print_header "cabal-install: cabal-testsuite"
 
-CMD="$($CABALLISTBIN cabal-testsuite:exe:cabal-tests) --builddir=$CABAL_TESTSUITE_BDIR --with-cabal=$($CABALLISTBIN cabal-install:exe:cabal) $TESTSUITEJOBS  --with-ghc=$HC --hide-successes --intree-cabal-lib=$PWD --test-tmp=$PWD/testdb"
+CMD="$($CABALLISTBIN cabal-testsuite:exe:cabal-tests) --builddir=$CABAL_TESTSUITE_BDIR --with-cabal=$($CABALLISTBIN cabal-install:exe:cabal) $TESTSUITEJOBS  --with-ghc=$HC --hide-successes --intree-cabal-lib=$PWD --test-tmp=$PWD/testdb $RTSOPTS"
 (cd cabal-testsuite && timed $CMD) || exit 1
 }