support 64bit target

Author: lotabout

README.md

@@ -6,7 +6,7 @@ File `xc.c` is the original one and `xc-tutor.c` is the one that I make for
 the tutorial step by step.
 
 ```
-gcc -o xc xc.c (you may need the -m32 option on 64bit machines)
+gcc -o xc xc.c
 ./xc hello.c
 ./xc -s hello.c
 

xc-tutor.c

@@ -5,6 +5,7 @@
 #include <stdlib.h>
 #include <memory.h>
 #include <string.h>
+#define int long long // to work with 64bit address
 
 int token;                    // current token
 int token_val;                // value of current token (mainly for number)
@@ -1251,8 +1252,11 @@ int eval() {
     return 0;
 }
 
+#undef int // Mac/clang needs this to compile
+
 int main(int argc, char **argv)
 {
+    #define int long long // to work with 64bit address
 
     int i, fd;
     int *tmp;

xc.c

@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <memory.h>
 #include <string.h>
+#define int long long // to work with 64bit address
 
 int debug;    // print the executed instructions
 int assembly; // print out the assembly and source
@@ -1276,8 +1277,12 @@ int eval() {
     }
 }
 
+#undef int // Mac/clang needs this to compile
+
 int main(int argc, char **argv)
 {
+    #define int long long // to work with 64bit address
+
     int i, fd;
     int *tmp;