[Bug lto/47162] New: [4.6 Regression] LTO is broken

["hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47162

           Summary: [4.6 Regression] LTO is broken
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hjl.tools@gmail.com


On Linux/x86-64, revision168439 gave:

/export/gnu/import/svn/gcc-test/bld/./prev-gcc/xgcc
-B/export/gnu/import/svn/gcc-test/bld/./prev-gcc/
-B/usr/local/x86_64-unknown-linux-gnu/bin/
-B/usr/local/x86_64-unknown-linux-gnu/bin/
-B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem
/usr/local/x86_64-unknown-linux-gnu/include -isystem
/usr/local/x86_64-unknown-linux-gnu/sys-include      -g -O2 -flto=jobserver
-fuse-linker-plugin -frandom-seed=1 -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 -Werror
-Wold-style-definition -Wc++-compat -fno-common  -DHAVE_CONFIG_H
-DGENERATOR_FILE -static-libstdc++ -static-libgcc  -o build/genconstants \
        build/genconstants.o build/read-md.o build/errors.o
.././libiberty/libiberty.a
lto1: internal compiler error: bytecode stream: trying to read 0 bytes after
the end of the input buffer
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
make[7]: *** [/tmp/cc7rbITJ.ltrans0.ltrans.o] Error 1
lto-wrapper: make returned 2 exit status
/usr/local/x86_64-unknown-linux-gnu/bin/ld: lto-wrapper failed
collect2: ld returned 1 exit status
make[6]: *** [build/genconstants] Error 1
make[6]: *** Waiting for unfinished jobs....
lto1: internal compiler error: bytecode stream: expected tag tree_list instead
of LTO_UNKNOWN
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
make[7]: *** [/tmp/cc2SG2hC.ltrans2.ltrans.o] Error 1
make[7]: *** Waiting for unfinished jobs....
lto-wrapper: make returned 2 exit status
/usr/local/x86_64-unknown-linux-gnu/bin/ld: lto-wrapper failed
collect2: ld returned 1 exit status
make[6]: *** [build/genenums] Error 1
rm gcj-dbtool.pod jcf-dump.pod jv-convert.pod grmic.pod gcj.pod gc-analyze.pod
cpp.pod gfdl.pod gij.pod gcc.pod gcov.pod gfortran.pod fsf-funding.pod
make[6]: Leaving directory `/export/gnu/import/svn/gcc-test/bld/gcc'
make[5]: *** [all-stage2-gcc] Error 2
make[5]: Leaving directory `/export/gnu/import/svn/gcc-test/bld'
make[4]: *** [stage2-bubble] Error 2
make[4]: Leaving directory `/export/gnu/import/svn/gcc-test/bld'
make[3]: *** [bootstrap] Error 2
make[3]: Leaving directory `/export/gnu/import/svn/gcc-test/bld'

and benchspec/CINT2000/176.gcc/run/00000001/make.err:

 lto1: internal compiler error: bytecode stream: trying to read 0 bytes after
the end of the input buffer
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
make[4]: *** [/tmp/ccWt9u22.ltrans4.ltrans.o] Error 1
lto-wrapper: make returned 2 exit status
/usr/local/bin/ld: lto-wrapper failed
collect2: ld returned 1 exit status

Revision 168415 is OK.