redhat 交叉编译 gcc设置

samon_fu

1. 
   
2. torshie@Orz:/tmp$ cat t.c
   
3. int f() {
   
4.         int x = 35;
   
5.         int y = 20;
   
6.         return x + y;
   
7. }
   
8. torshie@Orz:/tmp$ cat main.c
   
9. extern int f();
   
10. int main() {
    
11.         printf("%d\n", f());
    
12. }
    
13. torshie@Orz:/tmp$ gcc t.c -m32 -c
    
14. torshie@Orz:/tmp$ gcc main.c -m64 -c
    
15. main.c: In function ‘main’:
    
16. main.c:3: warning: incompatible implicit declaration of built-in function ‘printf’
    
17. torshie@Orz:/tmp$ gcc main.o t.o
    
18. /usr/bin/ld: i386 architecture of input file `t.o' is incompatible with i386:x86-64 output
    
19. collect2: ld returned 1 exit status
    
20. torshie@Orz:/tmp$ objcopy t.o -O elf64-x86-64
    
21. torshie@Orz:/tmp$ gcc main.o t.o
    
22. torshie@Orz:/tmp$ ./a.out
    
23. Segmentation fault
    
24. torshie@Orz:/tmp$ gcc t.c -O2 -c -m32
    
25. torshie@Orz:/tmp$ objcopy -O elf64-x86-64 t.o
    
26. torshie@Orz:/tmp$ gcc t.o main.o
    
27. torshie@Orz:/tmp$ ./a.out
    
28. 55
    
29. torshie@Orz:/tmp$ uname -a
    
30. Linux Orz 2.6.27-7-generic #1 SMP Tue Nov 4 19:33:06 UTC 2008 x86_64 GNU/Linux
    
31. torshie@Orz:/tmp$ cat /proc/cpuinfo |grep 'model name'
    
32. model name        : Intel(R) Core(TM)2 Duo CPU     E8200  @ 2.66GHz
    
33. model name        : Intel(R) Core(TM)2 Duo CPU     E8200  @ 2.66GHz
    

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samon_fu

n久以前看到的帖子，例子已经在了，剩下自己看着搞吧。