Introduce the fuzzer crate and make rules

Makefile.in

@@ -211,3 +211,4 @@ include $(CFG_SRC_DIR)/mk/dist.mk
 include $(CFG_SRC_DIR)/mk/snap.mk
 include $(CFG_SRC_DIR)/mk/clean.mk
 include $(CFG_SRC_DIR)/mk/autodep.mk
+include $(CFG_SRC_DIR)/mk/fuzzer.mk

mk/fuzzer.mk

@@ -0,0 +1,10 @@
+# At the moment the fuzzer only exists in stage2.  That's the first
+# stage built by the non-snapshot compiler so it seems a convenient
+# stage to work at.
+
+FUZZER_CRATE := $(S)src/fuzzer/fuzzer.rc
+FUZZER_INPUTS := $(wildcard $(addprefix $(S)src/fuzzer/, *.rs))
+
+stage2/fuzzer.o: $(FUZZER_CRATE) $(FUZZER_INPUTS) $(SREQ1)
+	@$(call E, compile: $@)
+	$(STAGE1) -c -o $@ $<

src/fuzzer/Fuzzer.rs

@@ -0,0 +1,2 @@
+fn main() {
+}

src/fuzzer/fuzzer.rc

@@ -0,0 +1,13 @@
+// -*- rust -*-
+
+use std;
+
+mod Fuzzer;
+
+// Local Variables:
+// fill-column: 78;
+// indent-tabs-mode: nil
+// c-basic-offset: 4
+// buffer-file-coding-system: utf-8-unix
+// compile-command: "make -k -C $RBUILD 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
+// End: