$ /home/edwin/inst/bin/g++ -v
Using built-in specs.
COLLECT_GCC=/home/edwin/inst/bin/g++
COLLECT_LTO_WRAPPER=/home/edwin/inst/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc/configure --enable-lto --enable-languages=c,c++
--enable-gold
Thread model: posix
gcc version 4.5.0 20091019 (experimental) (GCC)

sh -x script
+ /home/edwin/inst/bin/g++ -fPIC SourceMgr.i -flto -fno-exceptions -O1 -c -o
SourceMgr.o
+ /home/edwin/inst/bin/g++ -fPIC AsmMatcherEmitter.i -flto -O1 -c -o
AsmMatcher.o
+ /home/edwin/inst/bin/g++ -flto -use-linked-plugin -O1 AsmMatcher.o
SourceMgr.o -shared
In function ‘EmitIsSubclass’:
lto1: error: BB 14 can not throw but has an EH edge
lto1: error: BB 15 can not throw but has an EH edge
lto1: error: BB 16 can not throw but has an EH edge
lto1: error: BB 18 can not throw but has an EH edge
lto1: error: BB 19 can not throw but has an EH edge
lto1: error: BB 20 can not throw but has an EH edge
lto1: error: BB 22 can not throw but has an EH edge
lto1: error: BB 23 can not throw but has an EH edge
lto1: error: BB 25 can not throw but has an EH edge
lto1: error: BB 26 can not throw but has an EH edge
lto1: error: BB 27 can not throw but has an EH edge
lto1: error: BB 30 can not throw but has an EH edge
lto1: internal compiler error: verify_flow_info failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: /home/edwin/inst/bin/g++ returned 1 exit status
collect2: lto-wrapper returned 1 exit status


-- 
           Summary: LTO: -flto -O1 -use-linker-plugin, linking files
                    compiled with -fno-exceptions with ones compiled with
                    exceptions yields error "BB 14 can not throw but has an
                    EH edge"
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: edwintorok at gmail dot com
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41756