[Bug c++/83931] New: Add support for -nostdlib++

[thomasanderson at google dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83931

            Bug ID: 83931
           Summary: Add support for -nostdlib++
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: thomasanderson at google dot com
  Target Milestone: ---

Projects that want to link their own c++ standard library must currently pass
-nostdlib or -nodefaultlibs.  This means projects must add back -lm, -lc and so
on.  -nostdlib++ should be added (analogous to -nostdlib) for this use case.

LLVM added this feature in r308997 (https://reviews.llvm.org/rL308997), so gcc
should do the same.