[Bug c++/94835] New: ICE in vague_linkage_p, at cp/decl2.c:2041

["casner at acm dot org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94835

            Bug ID: 94835
           Summary: ICE in vague_linkage_p, at cp/decl2.c:2041
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: casner at acm dot org
  Target Milestone: ---

I am working on a pdp11-elf32 target in binutils with the goal of being able to
compile C++ for the PDP11 (an effort instigated by Paul Koning, gcc PDP11
maintainer).  I have a first implementation running, so now I am trying to
build g++ and libstdc++v3 to go with it.

I am attempting to build the gcc tree with newlib and libgloss symlinked in and
with the binutils components installed at the prefix and with gcc configured as
follows:

../configure --target=pdp11-elf32 --prefix=/usr/local --enable-languages=c,c++
--disable-libssp --disable-libgfortran --disable-libobjc --with-gmp=/opt/local/
--with-mpfr=/opt/local/ --with-mpc=/opt/local/
--with-libiconv-prefix=/opt/local --with-newlib

My host is running macOS 10.14.6.  gcc and g++ build successfully, but while
building libstdc++v3 I get:

.../libstdc++-v3/include/chrono:544:7: internal compiler error: in
vague_linkage_p, at cp/decl2.c:2041

This is with code freshly fetched with git today.
19667c82e479dc2bf8351588ed57aff90220b748