[Bug bootstrap/92680] New: PGO bootstrap is broken with --with-build-config=bootstrap-lto-lean and in-itree mpfr

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92680

            Bug ID: 92680
           Summary: PGO bootstrap is broken with
                    --with-build-config=bootstrap-lto-lean and in-itree
                    mpfr
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hubicka at gcc dot gnu.org
  Target Milestone: ---

Build with bootstrap-lto-lean with in-tree mpfr fails in profile mismatch on
set_d.o.  This is caused by fact that mpfr actually misconfigures itself with
LTO. Its configure script scans assembly to detect format of long double and
this gives wrong answer with LTO leading to suboptimal configuration.