[LLVMdev] RFC: -fwritable-strings Change

[Bill Wendling]

There is a problem with Objective-C code where a null string is placed
in the wrong section. If we have this code:

#include <Foundation/Foundation.h>
void foo() {
  NSLog(@"");
}

The null string is defined like this:

	.const
	.lcomm	LC,1,0		## LC

Causing our linker to go nuts, because it expects anonymous strings to
be in the __cstring section. I came up with the attached patch, which
places the string in the .cstring section.

My GCC-fu isn't great. Could someone review this to see if I broke anything?

Thanks!
-bw
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