linux内核编译问题——undefined reference to `error'

最新推荐文章于 2022-05-24 14:47:03 发布

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本文记录了在内核版本2.6.33.9编译zImage过程中遇到的undefined reference to `error`错误，并详细描述了解决步骤。通过修改decompress.c中的error为error_fn，成功解决了编译问题。

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内核版本 2.6.33.9

make zImage时出现如下错误：

LD      arch/arm/boot/compressed/vmlinux
arch/arm/boot/compressed/decompress.o(.text+0x23c0): In function `do_decompress':
arch/arm/boot/compressed/../../../../lib/decompress_inflate.c:67: undefined reference to `error'
arch/arm/boot/compressed/decompress.o(.text+0x23e0):arch/arm/boot/compressed/../../../../lib/decompress_inflate.c:73: undefined reference to `error'
arch/arm/boot/compressed/decompress.o(.text+0x2404):arch/arm/boot/compressed/../../../../lib/decompress_inflate.c:80: undefined reference to `error'
arch/arm/boot/compressed/decompress.o(.text+0x2468):arch/arm/boot/compressed/../../../../lib/decompress_inflate.c:95: undefined reference to `error'
arch/arm/boot/compressed/decompress.o(.text+0x2548):arch/arm/boot/compressed/../../../../lib/decompress_inflate.c:152: undefined reference to `error'
/usr/src/rtllinux-3.2-rc1/linux/arch/arm/boot/compressed/Makefile:111: recipe for target 'arch/arm/boot/compressed/vmlinux' failed
make[2]: *** [arch/arm/boot/compressed/vmlinux] Error 1
/usr/src/rtllinux-3.2-rc1/linux/arch/arm/boot/Makefile:54: recipe for target 'arch/arm/boot/compressed/vmlinux' failed
make[1]: *** [arch/arm/boot/compressed/vmlinux] Error 2
/usr/src/rtllinux-3.2-rc1/linux/arch/arm/Makefile:252: recipe for target 'zImage' failed
make: *** [zImage] Error 2

根据提示中目录 ./arch/arm/boot/compressed/decompress.o找到decompress.c文件，查看源码，发现do_decompress函数并无问题。

void do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
{
        decompress(input, len, NULL, NULL, output, NULL, error); }

然后查看源码中所引用目录及文件，发现./lib/decompress_inflate.c 找到其所在目录，打开文件，发现末尾行对decompress 函数的定义为 #define decompress gunzip

再在当前文件下找到 gunzip 的定义，

STATIC int INIT gunzip(unsigned char *buf, int len,
                       int(*fill)(void*, unsigned int),
                       int(*flush)(void*, unsigned int),
                       unsigned char *out_buf,
                       int *pos,
                       void(*error_fn)(char *x))

发现所用为error_fn 而非 error，于是改回error后发现仍然出现错误，

参考http://blog.youkuaiyun.com/einsteinz/article/details/5757607 文章中所提，将decompress.c 中所有error 改为error_fn 发现可以继续编译。