[Bug sanitizer/66343] New: "Error: .Lubsan_type3 already defined" with UBSan and precompiled headers

["andrey.vihrov at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66343

            Bug ID: 66343
           Summary: "Error: .Lubsan_type3 already defined" with UBSan and
                    precompiled headers
           Product: gcc
           Version: 5.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: andrey.vihrov at gmail dot com
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org
  Target Milestone: ---

Using this source as test.cpp:

#include <iostream>

int arr[2];

int main()
{
    int d, i = 0;
    std::cin >> d;
    int x = arr[i] - arr[i+1];
    int res = (d - 1) / d;
}

and compiling with

g++ -o stdc++.h.gch -x c++-header
/usr/include/c++/5.1.0/x86_64-unknown-linux-gnu/32/bits/stdc++.h -m32
-fsanitize=undefined && g++ -o test test.cpp -I. -include stdc++.h -m32
-fsanitize=undefined -Winvalid-pch

(this command precompiles <bits/stdc++.h> as stdc++.h.gch, then uses it with
the above program), the result is

/tmp/ccw5nd8W.s: Assembler messages:
/tmp/ccw5nd8W.s:86: Error: symbol `.Lubsan_type3' is already defined

I'm not attaching a preprocessed source because this problem appears only with
precompiled headers.

gcc -v:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /build/gcc-multilib/src/gcc-5-20150519/configure --prefix=/usr
--libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --enable-multilib --disable-werror
--enable-checking=release --with-default-libstdcxx-abi=c++98
Thread model: posix
gcc version 5.1.0 (GCC)