[Bug c++/56302] New: [4.8 Regression] sys/sdt.h asms stopped working at -O0

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56302

             Bug #: 56302
           Summary: [4.8 Regression] sys/sdt.h asms stopped working at -O0
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: jakub@gcc.gnu.org
        ReportedBy: jakub@gcc.gnu.org


void
foo (const int x)
{
  __asm__ __volatile__ ("" : : "n" (-1 * (int) sizeof (&x)));
}

compiled just fine even at -O0 in 4.7, but starting with
http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=192141
is no longer accepted at -O0.