[Bug bootstrap/84450] New: bootstrap-lto ICE in g-dyntab.adb

[steven at uplinklabs dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84450

            Bug ID: 84450
           Summary: bootstrap-lto ICE in g-dyntab.adb
           Product: gcc
           Version: 7.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: steven at uplinklabs dot net
  Target Milestone: ---

This bug has been around for at least a few GCC versions now, but I hadn't
gotten around to reporting it.

My configure flags:

      --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu \
      --prefix=/usr \
      --libdir=/usr/lib \
      --libexecdir=/usr/lib \
      --mandir=/usr/share/man \
      --infodir=/usr/share/info \
      --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ \
      --with-build-config=bootstrap-lto \
      --disable-libssp \
      --disable-libstdcxx-pch \
      --disable-libunwind-exceptions \
      --disable-werror \
      --enable-__cxa_atexit \
      --enable-checking=release \
      --enable-clocale=gnu \
      --enable-gnu-indirect-function \
      --enable-gnu-unique-object \
      --enable-initfini-array \
      --enable-install-libiberty \
      --enable-libmpx \
      --enable-linker-build-id \
      --enable-lto \
      --enable-multilib \
      --enable-plugin \
      --enable-shared \
      --enable-threads=posix \
      --with-isl \
      --with-linker-hash-style=gnu \
      --with-multilib-list=m32,m64,mx32 \
      --with-system-zlib

Non-bootstrap-lto builds work fine, but if I -do- try a bootstrap-lto build, I
get this:

/build/gcc-multilib/src/gcc/gcc/ada/g-dyntab.adb: In function
‘prep__symbol_table__free’:
/build/gcc-multilib/src/gcc/gcc/ada/g-dyntab.adb:140:9: internal compiler
error: in gen_typedef_die, at dwarf2out.c:24370
    end Free;
         ^
0x8b8125 gen_typedef_die
        /build/gcc-multilib/src/gcc/gcc/dwarf2out.c:24370
0x8ba02b gen_decl_die
        /build/gcc-multilib/src/gcc/gcc/dwarf2out.c:25390
0x8b866b gen_type_die_with_usage
        /build/gcc-multilib/src/gcc/gcc/dwarf2out.c:24547
0x8b8de2 gen_type_die
        /build/gcc-multilib/src/gcc/gcc/dwarf2out.c:24758
0x8ba0aa gen_decl_die
        /build/gcc-multilib/src/gcc/gcc/dwarf2out.c:25410
0x8b9204 process_scope_var
        /build/gcc-multilib/src/gcc/gcc/dwarf2out.c:24903
0x8b9262 decls_for_scope
        /build/gcc-multilib/src/gcc/gcc/dwarf2out.c:24928
0x8b3d1a gen_subprogram_die
        /build/gcc-multilib/src/gcc/gcc/dwarf2out.c:22465
0x8b9f58 gen_decl_die
        /build/gcc-multilib/src/gcc/gcc/dwarf2out.c:25364
0x8badaa dwarf2out_decl
        /build/gcc-multilib/src/gcc/gcc/dwarf2out.c:25879
0x8bae09 dwarf2out_function_decl
        /build/gcc-multilib/src/gcc/gcc/dwarf2out.c:25894
0x939efe rest_of_handle_final
        /build/gcc-multilib/src/gcc/gcc/final.c:4520
0x93a06c execute
        /build/gcc-multilib/src/gcc/gcc/final.c:4562

This is built from gcc-7-branch@257786.

Any more details I can provide?