[cfe-dev] How to refer to linker script symbols?

[Anton Blanchard]

Hi,

The Linux kernel makes extensive use of linker script symbols indicating
the start and end of section. An example:

extern const char *__start___trace_bprintk_fmt[];
extern const char *__stop___trace_bprintk_fmt[];

int foo(void)
{
	return __stop___trace_bprintk_fmt != __start___trace_bprintk_fmt;
}

Clang assumes these two symbols can't alias, emits a warning and optimises
the comparison away:

foo.c:6:36: warning: array comparison always evaluates to true

...

foo:
	li 3, 1
	blr

In this particular case the section is empty, so the two symbols do
point to the same address. Any thoughts on the best way to solve this? 

Anton