[Bug lto/52405] New: undefined references in shared library when linking the shared library with -flto

["doko at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52405

             Bug #: 52405
           Summary: undefined references in shared library when linking
                    the shared library with -flto
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: doko@gcc.gnu.org


seen with the 4.6 branch, and 4.7 20120223. The object files are built with
-flto as well.  Linking the shared library with -flto results in unresolved
symbols when linking against the share library. Not building the shared library
with -flto lets the launcher link succeed.

the object files (x86_64-linux-gnu) including the build script build.sh can be
found at
http://people.debian.org/~doko/tmp/hs.tar.xz

The undefined symbols come from inline template definitions in a header file.

gcc-4.7 -m64 -fpic -fno-rtti -fno-exceptions -fcheck-new -fvisibility=hidden
-m64 -flto -g -O3 -fno-strict-aliasing -fno-omit-frame-pointer
-fuse-linker-plugin -Xlinker -O1 -Wl,-Bsymbolic-functions   -Xlinker -z
-Xlinker noexecstack -m64 -Xlinker -export-dynamic  -L `pwd` -o gamma
launcher/java_md.o launcher/wildcard.o launcher/java.o launcher/jli_util.o
-ljvm -lm -ldl -lpthread
/home/packages/openjdk/7/openjdk-7-7~u3-2.1/build/openjdk.build-boot/hotspot/outputdir/linux_amd64_compiler2/product/libjvm.so:
undefined reference to `void
G1ParPushHeapRSClosure::do_oop_nv<oopDesc*>(oopDesc**)'
/home/packages/openjdk/7/openjdk-7-7~u3-2.1/build/openjdk.build-boot/hotspot/outputdir/linux_amd64_compiler2/product/libjvm.so:
undefined reference to `void
FilterIntoCSClosure::do_oop_nv<oopDesc*>(oopDesc**)'
/home/packages/openjdk/7/openjdk-7-7~u3-2.1/build/openjdk.build-boot/hotspot/outputdir/linux_amd64_compiler2/product/libjvm.so:
undefined reference to `void G1ParPushHeapRSClosure::do_oop_nv<unsigned
int>(unsigned int*)'
collect2: error: ld returned 1 exit status
make[8]: *** [gamma] Error 1