[Bug bootstrap/69440] New: [6 Regression] Revision 232071 breaks bootstrap on x86_64-w64-mingw32

["rainer at emrich-ebersheim dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69440

            Bug ID: 69440
           Summary: [6 Regression] Revision 232071 breaks bootstrap on
                    x86_64-w64-mingw32
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rainer@emrich-ebersheim.de
  Target Milestone: ---

gcc 6.0 rev. 232071
binutils-2.25.1

fails in stage 1 at linking of libstdc++-6.dll:

libtool: link: 
/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/./gcc/xgcc -shared-libgcc
-B/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/./gcc -nostdinc++
-L/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/x86_64-w6
4-mingw32/libstdc++-v3/src
-L/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/x86_64-w64-mingw32/libstdc++-v3/src/.libs
-L/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/x86_64-w64-mingw32/libstdc++-v3/libsupc++/.libs
-L/opt
/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-6.0.0/x86_64-w64-mingw32/lib
-L/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-6.0.0/mingw/lib
-isystem /opt/devel/gnu/gcc/MINGW_
NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-6.0.0/x86_64-w64-mingw32/include
-isystem
/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-6.0.0/mingw/include
-B/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-6.0.0/x86_64-w64-mingw32/bin/
-B/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-6.0.0/x86_64-w64-mingw32/lib/
-isystem
/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-6.0.0/x86_64-w64-mingw32/include
-isystem
/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-6.0.0/x86_64-w64-mingw32/sys-include
   -shared -nostdlib D:/x86_64-w64-trunk/mingw/lib/../lib/dllcrt2.o
D:/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/gcc/crtbegin.o 
.libs/compatibility.o .libs/compatibility-debug_list.o
.libs/compatibility-debug_list-2.o .libs/compatibility-c++0x.o
.libs/compatibility-atomic-c++0x.o .libs/compatibility-thread-c++0x.o
.libs/compatibility-chrono.o .libs/compatibility-condvar.o  -Wl,--whole-archive
../libsupc++/.libs/libsupc++convenience.a
../src/c++98/.libs/libc++98convenience.a
../src/c++11/.libs/libc++11convenience.a -Wl,--no-whole-archive 
-L/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/x86_64-w64-mingw32/libstdc++-v3/libsupc++/.libs
-L/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/x86_64-w64-mingw32/libstdc++-v3/src
-L/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/x86_64-w64-mingw32/libstdc++-v3/src/.libs
-L/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-6.0.0/x86_64-w64-mingw32/lib
-L/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-6.0.0/mingw/lib
-LD:/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/x86_64-w64-mingw32/libstdc++-v3/src
-LD:/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/x86_64-w64-mingw32/libstdc++-v3/src/.libs
-LD:/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/x86_64-w64-mingw32/libstdc++-v3/libsupc++/.libs
-LD:/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-6.0.0/x86_64-w64-mingw32/lib
-LD:/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-6.0.0/mingw/lib
-LD:/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/gcc
-LD:/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-6.0.0/x86_64-w64-mingw32/bin
-LD:/x86_64-w64-trunk/mingw/lib/../lib -LD:/x86_64-w64-trunk/mingw/lib
-lmingw32 -lgcc_s -lgcc -lmoldname -lmingwex -lmsvcrt -lpthread -ladvapi32
-lshell32 -luser32 -lkernel32 -lmingw32 -lgcc_s -lgcc -lmoldname -lmingwex
-lmsvcrt D:/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/gcc/crtend.o 
-Wl,-O1 -Wl,--gc-sections -Wl,--version-script=libstdc++-symbols.ver   -o
.libs/libstdc++-6.dll -Wl,--enable-auto-image-base -Xlinker --out-implib
-Xlinker .libs/libstdc++.dll.a
.libs/compatibility.o: In function `std::istream::ignore(long long)':
D:\opt\devel\SCRATCH\tmp.CBVRJUmhUP\gcc-6.0.0\gcc-6.0.0\x86_64-w64-mingw32\libstdc++-v3\src/../../../../../../../../../opt/devel/gnu/src/gcc-mingw-w64/gcc-6.0.0/libstdc++-v3/src/c++98/compatibility.cc:67:
undefined reference to `std::istream::sentry::sentry(std::istream&, bool)'
.libs/compatibility.o: In function `std::basic_ios<char, std::char_traits<char>
>::setstate(std::_Ios_Iostate)':
D:/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/x86_64-w64-mingw32/libstdc++-v3/include/bits/basic_ios.h:158:
undefined reference to `std::basic_ios<char, std::char_traits<char>
>::clear(std::_Ios_Iostate)'
.libs/compatibility.o: In function `std::istream::ignore(long long)':
D:\opt\devel\SCRATCH\tmp.CBVRJUmhUP\gcc-6.0.0\gcc-6.0.0\x86_64-w64-mingw32\libstdc++-v3\src/../../../../../../../../../opt/devel/gnu/src/gcc-mingw-w64/gcc-6.0.0/libstdc++-v3/src/c++98/compatibility.cc:64:
undefined reference to `std::istream::ignore()'
.libs/compatibility.o: In function `std::basic_istream<wchar_t,
std::char_traits<wchar_t> >::ignore(long long)':
D:\opt\devel\SCRATCH\tmp.CBVRJUmhUP\gcc-6.0.0\gcc-6.0.0\x86_64-w64-mingw32\libstdc++-v3\src/../../../../../../../../../opt/devel/gnu/src/gcc-mingw-w64/gcc-6.0.0/libstdc++-v3/src/c++98/compatibility.cc:139:
undefined reference to `std::basic_istream<wchar_t, std::char_traits<wchar_t>
>::sentry::sentry(std::basic_istream<wchar_t, std::char_traits<wchar_t> >&,
bool)'
.libs/compatibility.o: In function `std::basic_ios<wchar_t,
std::char_traits<wchar_t> >::setstate(std::_Ios_Iostate)':
D:/opt/devel/SCRATCH/tmp.CBVRJUmhUP/gcc-6.0.0/gcc-6.0.0/x86_64-w64-mingw32/libstdc++-v3/include/bits/basic_ios.h:158:
undefined reference to `std::basic_ios<wchar_t, std::char_traits<wchar_t>
>::clear(std::_Ios_Iostate)'
.libs/compatibility.o: In function `std::basic_istream<wchar_t,
std::char_traits<wchar_t> >::ignore(long long)':
D:\opt\devel\SCRATCH\tmp.CBVRJUmhUP\gcc-6.0.0\gcc-6.0.0\x86_64-w64-mingw32\libstdc++-v3\src/../../../../../../../../../opt/devel/gnu/src/gcc-mingw-w64/gcc-6.0.0/libstdc++-v3/src/c++98/compatibility.cc:136:
undefined reference to `std::basic_istream<wchar_t, std::char_traits<wchar_t>
>::ignore()'
.libs/compatibility.o:compatibility.cc:(.rdata$_ZTIN10__cxxabiv115__forced_unwindE+0x0):
undefined reference to `vtable for __cxxabiv1::__class_type_info'
.libs/compatibility-c++0x.o: In function `message':
D:\opt\devel\SCRATCH\tmp.CBVRJUmhUP\gcc-6.0.0\gcc-6.0.0\x86_64-w64-mingw32\libstdc++-v3\src/../../../../../../../../../opt/devel/gnu/src/gcc-mingw-w64/gcc-6.0.0/libstdc++-v3/src/c++11/compatibility-c++0x.cc:210:
undefined reference to `std::basic_string<char, std::char_traits<char>,
std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)'
.libs/compatibility-c++0x.o:compatibility-c++0x.cc:(.rdata$_ZTISt9exception+0x0):
undefined reference to `vtable for __cxxabiv1::__class_type_info'
.
.
.
.

hundreds of undefined references!


That's caused by revision 232071:

        PR target/66655
        * config/i386/cygming.h (MAKE_DECL_ONE_ONLY): Define to use weak
        decls if weak support is available.

--- trunk/gcc/config/i386/cygming.h     2016/01/04 14:30:50     232055
+++ trunk/gcc/config/i386/cygming.h     2016/01/05 10:57:01     232071
@@ -432,6 +432,11 @@
       fputc ('\n', (FILE));           \
     }                                 \
   while (0)
+
+/* Use the weak support for ONE_ONLY decls.  */
+#undef  MAKE_DECL_ONE_ONLY
+#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
+
 #endif /* HAVE_GAS_WEAK */

 /* FIXME: SUPPORTS_WEAK && TARGET_HAVE_NAMED_SECTIONS is true,