first commit

.gitignore

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+example
+/*.o
+/*.a
+/*.swp

Makefile

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+CFLAGS=  -Wall -Wextra -Wfatal-errors -g3
+LDFLAGS= -s
+OBJS=    
+RSFLAGS= --target=x86_64-unknown-linux-gnu --crate-type=staticlib
+
+all: example
+example: main.o librs.a
+	$(CC) $(LDFLAGS) $^ -o $@
+lib%.a: %.rs
+	rustc --target=x86_64-unknown-linux-gnu --crate-type=staticlib $^
+%.o: %.c
+	$(CC) $(CFLAGS) -c $^
+clean:
+	$(RM) $(OBJS) example *.o librs.a

main.c

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+#include<stdio.h>
+extern int ok(int*x);
+
+int main(void)
+{
+	int a[]={2,3,4};
+	printf("ok:%d\n",ok(a));
+}

rs.rs

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+#[no_mangle]
+pub extern "C" fn ok(x:&[i32;3])->i32
+{
+    let mut y:Vec<i32>=vec![5;15];
+    unsafe
+    {
+        y[0]=x[2];
+    }
+    return y[0];
+}