Created attachment 486120 [details]
compilation units that fail to link with -O2 -flto

Version-Release number of selected component (if applicable):
gcc-c++-4.6.0-0.12.fc15.i686


How reproducible:

Every time.


Steps to Reproduce:
1. Unpack the attached tarball.
2. Execute: g++ -O2 -flto -o gtk-gnash gtk_gnash-gnash.o gtk_gnash-gui.o gtk_gnash-Player.o  gtk_gnash-ScreenShotter.o libgnashcore.so
3. Observe ICE.
  
Actual results:
Internal Compiler Error.

Expected results:
Linking error (no errors in original setup).

Additional info:

I have tried to reduce the link command as much as possible by removing depedent libraries and compilation unites from the link line. (Though this of course would lead to linker errors when g++ invokes the linker.) To retrace my steps entirely, one would download Gnash from git and build with CXXFLAGS="-O2 -flto". If the project is built with -O1 -flto rather than -O2 -flto, compilation and linking succeeds.

GCC from Fedora 15, last updated Fri Mar 04 2011:

Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i686-redhat-linux/4.6.0/lto-wrapper
Target: i686-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-java-awt=gtk --disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre --enable-libgcj-multifile --enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib --with-ppl --with-cloog --with-tune=generic --with-arch=i686 --build=i686-redhat-linux
Thread model: posix
gcc version 4.6.0 20110304 (Red Hat 4.6.0-0.12) (GCC)