[Bug target/79343] New: [7 Regression] error: PIC register clobbered by '%2' in 'asm'

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79343

            Bug ID: 79343
           Summary: [7 Regression] error: PIC register clobbered by '%2'
                    in 'asm'
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
  Target Milestone: ---

openblas fails to compile on ppc64le-linux starting with r235876.
Small testcase:
void
foo (void)
{
  asm volatile ("" : : : "%2");
}
sasum.c: In function ‘foo’:
sasum.c:4:3: error: PIC register clobbered by ‘%2’ in ‘asm’
   asm volatile ("" : : : "%2");
   ^~~

I thought ppc64le ELFv2 is not PIC by default (and it is rejected even with
-fno-pic).