FFI: Print whether FFI is enabled in -v/:v command

.github/workflows/ci.yml

@@ -153,7 +153,12 @@ jobs:
               cmd="cat \$1.stdout.mingw32 2>/dev/null || $cmd"
           fi
           ./bin/test-runner --ext=.icry -r ./output --exe=$(which bash) -F -c -F "$cmd" -F -- ./tests
-          TARGETS_JSON=$(echo -n "$(ls -1 ./output/tests)" | jq -Rsc 'split("\n")')
+          if cabal v2-exec cryptol -- -v | grep -q 'FFI enabled'; then
+              filter="cat"
+          else
+              filter="grep -v ffi"
+          fi
+          TARGETS_JSON=$(echo -n "$(ls -1 ./output/tests)" | $filter | jq -Rsc 'split("\n")')
           echo "::set-output name=targets-json::$TARGETS_JSON"
 
       - shell: bash

cry

@@ -79,11 +79,21 @@ case $COMMAND in
   test)
     echo Running tests
     setup_external_tools
-    if [ "$#" == "0" ]; then TESTS=tests; else TESTS=$*; fi
+    if [ "$#" == "0" ]; then
+      if cabal v2-exec cryptol -- -v | grep -q 'FFI enabled'; then
+        TESTS=(tests/*)
+      else
+        GLOBIGNORE="tests/ffi"
+        TESTS=(tests/*)
+        unset GLOBIGNORE
+      fi
+    else
+      TESTS=("$*")
+    fi
     $BIN/test-runner --ext=.icry \
       --exe=cabal \
       -F v2-run -F -v0 -F exe:cryptol -F -- -F -b \
-      $TESTS
+      "${TESTS[@]}"
     ;;
 
   rpc-test)

src/Cryptol/Version.hs

@@ -6,6 +6,7 @@
 -- Stability   :  provisional
 -- Portability :  portable
 
+{-# LANGUAGE CPP  #-}
 {-# LANGUAGE Safe #-}
 
 module Cryptol.Version (
@@ -39,6 +40,9 @@ displayVersion putLn = do
     putLn ("Cryptol " ++ ver)
     putLn ("Git commit " ++ commitHash)
     putLn ("    branch " ++ commitBranch ++ dirtyLab)
+#ifdef FFI_ENABLED
+    putLn "FFI enabled"
+#endif
       where
       dirtyLab | commitDirty = " (non-committed files present during build)"
                | otherwise   = ""