对组装系统调用错误不支持的重定位 [英] Error unsupported relocate against assembly system call

问题描述

我试图交叉编译的glibc-2.18飞思卡尔PowerPC的评估板。

目前我得到下面的错误在构建的一个阶段：

 的glibc
失败：
 ../sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext.S：汇编的消息：
 ../sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext.S:40：错误：对不支持swapcontext搬迁
 使[3]：*** [/home/user/Desktop/SmoothWall/bcutm/distrib/build/sources/glibc/glibc-2.18-compile/stdlib/setcontext.o]错误1
 使[3]：离开目录/home/user/Desktop/SmoothWall/bcutm/distrib/build/sources/glibc/glibc-2.18/stdlib
 使[2]：*** [STDLIB / subdir_lib]错误2
 使[2]：离开目录`/home/user/Desktop/SmoothWall/bcutm/distrib/build/sources/glibc/glibc-2.18
 使[1]：*** [全部]错误2
 使[1]：离开目录`/home/user/Desktop/SmoothWall/bcutm/distrib/build/sources/glibc/glibc-2.18-compile
 

解决方案

的 SYS_ify（swapcontext）宏应该评估为 __ NR_swapcontext ，这对于swapcontext系统调用的数目。

__ NR_swapcontext 是一个宏观的，而不是一个变量名 - 所以它应该被preprocessor解决（见 ASM / unistd。 ^ h ）。它看起来像你没有这个定义，所以它没有得到preprocessed的系统调用号，所以留下你一个悬而未决的变量名。

所以，你的问题是缺少的定义__ NR_swapcontext ，它应该由glibc的编译是针对内核头文件提供。你有正确的内核头文件是否可用？

由于 swapcontext 是一个唯一的PowerPC的系统调用，它有可能，你想编译glibc的对你构建机器的头吧。

I am trying to cross compile glibc-2.18 for powerpc freescale evaluation board.

At one of the stages in the build I get following error:

    glibc
Failed:
 ../sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext.S: Assembler messages:
 ../sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext.S:40: Error: unsupported relocation against swapcontext
 make[3]: *** [/home/user/Desktop/SmoothWall/bcutm/distrib/build/sources/glibc/glibc-2.18-compile/stdlib/setcontext.o] Error 1
 make[3]: Leaving directory  /home/user/Desktop/SmoothWall/bcutm/distrib/build/sources/glibc/glibc-2.18/stdlib'
 make[2]: *** [stdlib/subdir_lib] Error 2
 make[2]: Leaving directory `/home/user/Desktop/SmoothWall/bcutm/distrib/build/sources/glibc/glibc-2.18'
 make[1]: *** [all] Error 2
 make[1]: Leaving directory `/home/user/Desktop/SmoothWall/bcutm/distrib/build/sources/glibc/glibc-2.18-compile'

解决方案

The SYS_ify(swapcontext) macro there should evaluate to __NR_swapcontext, which is the number for the swapcontext system call.

__NR_swapcontext is a macro, not a variable name - so it should have been resolved by the preprocessor (see asm/unistd.h). It looks like you don't have a definition for this, and so it didn't get preprocessed to the syscall number, and so left you with an unresolved variable name.

So, your problem is the missing definition for __NR_swapcontext, which should be provided by the kernel headers that glibc is compiling against. Do you have the correct kernel headers available?

Since swapcontext is a powerpc-only system call, it it possible that you're trying to compile glibc against your build machine's headers instead.

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