PPC64, compiling kernel: error in backend: Invalid register name global variable

[aik]

Bugzilla Link	52588
Version	trunk
OS	Linux
Attachments	shell script with cmdline, the problem file, shell tmux snapshot
CC	@zygoloid

Extended Description

Trying to fix the Linux kernel to build with LLVM on PPC64. Among other things, this came up.

[aik]

"long reladdr = addr - kernel_toc_addr();" is the problem place which (in my tree) looks like:

register unsigned long toc_ptr asm ("r2");

static inline unsigned long kernel_toc_addr(void)
{
return toc_ptr;
}