[Bug target/84829] New: -mieee-fp causes to link with -lieee but that is no longer available

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84829

            Bug ID: 84829
           Summary: -mieee-fp causes to link with -lieee but that is no
                    longer available
           Product: gcc
           Version: 7.3.1
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
                CC: jakub at gcc dot gnu.org, jsm28 at gcc dot gnu.org
  Target Milestone: ---
            Target: x86_64-*-*, i?86-*-*

Joseph, you removed libieee.a from glibc 2.27 but GCC still links against it
via gcc/config/gnu-user.h GNU_USER_TARGET_NO_PTHREADS_LIB_SPEC causing
programs building with -mieee-fp.

Docs for -mieee-fp say

@item -mieee-fp
@itemx -mno-ieee-fp
@opindex mieee-fp
@opindex mno-ieee-fp
Control whether or not the compiler uses IEEE floating-point
comparisons.  These correctly handle the case where the result of a
comparison is unordered.

I'm not sure whether that warrants linking with -lieee (in the past).