FFI: Set up tests

tests/.gitignore

@@ -1 +1,3 @@
 output
+*.so
+*.dylib

tests/ffi/Makefile

@@ -0,0 +1,28 @@
+CFLAGS += -Wall -Werror
+
+# For each C file foo.c, we make a phony target foo, then depending on the OS
+# map that to either foo.dylib or foo.so.
+
+CFILES = $(wildcard *.c)
+TARGETS = $(CFILES:.c=)
+
+all: $(TARGETS)
+
+.PHONY: all clean $(TARGETS)
+
+ifeq ($(shell uname),Darwin)
+EXT = .dylib
+else
+EXT = .so
+endif
+
+$(TARGETS): %: %$(EXT)
+
+%.dylib: %.c
+	$(CC) $(CFLAGS) -dynamiclib $< -o $@
+
+%.so: %.c
+	$(CC) $(CFLAGS) -fPIC -shared $< -o $@
+
+clean:
+	rm *$(EXT)

tests/ffi/test-ffi.c

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+int add(int x, int y) {
+  return x + y;
+}

tests/ffi/test-ffi.cry

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+foreign add : [32] -> [32] -> [32]

tests/ffi/test-ffi.icry

@@ -0,0 +1,3 @@
+:! make -s test-ffi
+:l test-ffi.cry
+add 1 2

tests/ffi/test-ffi.icry.stdout

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+Loading module Cryptol
+Loading module Cryptol
+Loading module Main
+0x00000003