[Bug lto/50351] New: An internal compiler error when building gcc4.6 using "-flto -fuse-linker-plugin" on Win7 mingw64 target

[xunxun1982 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50351

             Bug #: 50351
           Summary: An internal compiler error when building gcc4.6 using
                    "-flto -fuse-linker-plugin" on Win7 mingw64 target
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: xunxun1982@gmail.com
              Host: *-*-mingw*
            Target: *-*-mingw*
             Build: *-*-mingw*


Hi, all

    When I use mingw64 gcc build gcc4.6.2 20110909  using "-flto
-fuse-linker-plugin", an internal compiler error came out:
----------------------------------------------------------------------------------------------------------
i686-w64-mingw32-gcc   -pipe -g0 -O2 -fomit-frame-pointer -finline-functions
-minline-all-stringops -flto  -DIN_GCC   -W -Wall -Wwrite-strings -Wcast-qual
-Wstrict-prototypes -Wmissing-prototypes -Wmissing-format-attribute -pedantic
-Wno-long-long -Wno-variadic-macros -Wno-overlength-strings
-Wold-style-definition -Wc++-compat   -DHAVE_CONFIG_H -Wl,-O1 -Wl,--as-needed
-s -Wl,--large-address-aware  -flto -fuse-linker-plugin -o cc1.exe c-lang.o
c-family/stub-objc.o attribs.o c-errors.o c-decl.o c-typeck.o c-convert.o
c-aux-info.o c-objc-common.o c-parser.o tree-mudflap.o c-family/c-common.o
c-family/c-cppbuiltin.o c-family/c-dump.o c-family/c-format.o
c-family/c-gimplify.o c-family/c-lex.o c-family/c-omp.o c-family/c-opts.o
c-family/c-pch.o c-family/c-ppoutput.o c-family/c-pragma.o
c-family/c-pretty-print.o c-family/c-semantics.o c-family/c-ada-spec.o i386-c.o
msformat-c.o \
          cc1-checksum.o main.o  libbackend.a ../libcpp/libcpp.a
../libdecnumber/libdecnumber.a ../libcpp/libcpp.a  /mingw/lib/libiconv.a
../libiberty/libiberty.a ../libdecnumber/libdecnumber.a -lstdc++ -lcloog-isl
-lisl -lppl_c -lppl  -lgmpxx -lmpc -lmpfr -lgmp  -lstdc++ -lz
In file included from :1011:0:
source/isl/constraints.c: In function
'cloog_constraint_set_defining_inequalities':
isl_constraint.c:170:15: warning: 'l' may be used uninitialized in this
function [-Wuninitialized]
source/isl/constraints.c:154:25: note: 'l' was declared here
isl_constraint.c:166:9: warning: 'u' may be used uninitialized in this function
[-Wuninitialized]
source/isl/constraints.c:153:25: note: 'u' was declared here
In file included from ../.././gcc/c-decl.c:6139:0,
                 from ../.././gcc/c-decl.c:489,
                 from :5284:
../.././libcpp/lex.c: In function 'search_line_sse2':
../.././libcpp/lex.c:370:15: internal compiler error: in convert_move, at
expr.c:326
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: e:\MyPack\MinGW\bin\i686-w64-mingw32-gcc.exe returned 1 exit
status
e:/mypack/mingw/bin/../lib/gcc/i686-w64-mingw32/4.6.2/../../../../i686-w64-mingw32/bin/ld.exe:
lto-wrapper failed
collect2: ld returned 1 exit status
make[2]: *** [cc1.exe] Error 1
make[2]: Leaving directory `/e/new/gcc/gcc4.6/build/host-i686-w64-mingw32/gcc'
make[1]: *** [all-gcc] Error 2
make[1]: Leaving directory `/e/new/gcc/gcc4.6/build'
make: *** [all] Error 2
-------------------------------------------------------------------------------------------------------------------------------------------

my gcc is configured as:
-------------------------------------------------------------------------------------------------------------------------------------------
Target: i686-w64-mingw32
Configured with: ./configure --prefix=/mingw --host=i686-w64-mingw32
--build=i686-w64-mingw32 --target=i686-w64-mingw32 --with-lto-plugin
--with-host-libstdcxx=-lstdc++ --disable-bootstrap --disable-werror
--with-arch=i686 --with-tune=generic --enable-languages=c,c++,fortran
--enable-libgomp --enable-threads=posix --enable-lto --with-system-zlib
--enable-libstdcxx-debug --enable-version-specific-runtime-libs
--enable-fully-dynamic-string --disable-sjlj-exceptions --with-dwarf2
--disable-symvers --enable-checking=release --enable-cloog-backend=isl
--enable-static --disable-shared --enable-cxx-flags='-fno-function-sections
-fno-data-sections' --enable-libquadmath-support --enable-libquadmath
--disable-multilib --disable-nls --disable-win32-registry
-------------------------------------------------------------------------------------------------------------------------------------------

my binutils edition is :
2.21.53.20110910

Is this the LTO bug in gcc4.6 or ld bug?
The error seems like PR45475, but PR45475 don't use LTO.

Thanks.