../unxlngi6.pro/slo/uuid.o: In function `create': ../../inc/rtl/instance.hxx:292: undefined reference to `(anonymous namespace)::rtl_Instance<(anonymous namespace)::Pool, rtl::Static<(anonymous namespace)::Pool, (anonymous namespace)::PoolHolder>::StaticInstance, osl::Guard<osl::Mutex>, osl::GetGlobalMutex, int, int>::m_pInstance' So, attachment 1 is my testcase testme.ii with "g++ -c -fPIC -o testme.o testme.ii" compiled with "g++ (GCC) 4.1.1 20060629 (Red Hat 4.1.1-6)" I get the following attachment 2 [details] output from nm compiled with "g++ (GCC) 4.1.1 20060711 (Red Hat 4.1.1-7)" I get the following attachment 3 [details] output from nm the above missing symbol is U in -7 and V in -6
Created attachment 11877 [details] testcase
Created attachment 11878 [details] original -6 nm output
Created attachment 11879 [details] new nm -7 output
Created attachment 11880 [details] diff against testme.ii which will make it work for me This attachment is a diff against the testme.ii and makes the instance static class member into a local static variable. Which is acceptable for my use case, and works around the problem for me
This is invalid code with no diagnostic required. See the full explaination in PR 28360 which is exactly the same case. In fact with a real testcase :). *** This bug has been marked as a duplicate of 28360 ***
Basicially the code was violating ODR rules before because of the anonymous namespace.
Note I think you should have first checked FSF 4.1.2 which will have not this issue. 4.2.0 might have it, I might had been wrong at closing as a dup, that might be because I am tried and had a long day and it is 9:20 pm here already.
Here is a full reduced self contained testcase: namespace { template< typename Inst> struct rtl_Instance { static int * m_pInstance; }; template< typename Inst> int * rtl_Instance< Inst>::m_pInstance = 0; } int *foo(void) { return rtl_Instance<int >::m_pInstance; } int main (void) { return foo() == 0; } -------------------- It is only happens the namespace is anonymous which is why this is 4.2 only regression. Jason also applied his patch to redhat's 4.1 branch. Caolan, please next time test against a FSF release of the compiler before filing a bug because sometimes redhat backports patches to their branch.
The reason why the var is not emitted seems to be that note_vague_linkage_var is not called on it in finish_static_data_member_decl. If I replace if (! processing_template_decl && TREE_PUBLIC (decl)) note_vague_linkage_var (decl); back with: if (! processing_template_decl) note_vague_linkage_var (decl); it works just fine.
Testing a patch.
Subject: Bug 28370 Author: jakub Date: Sun Jul 16 20:17:20 2006 New Revision: 115503 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=115503 Log: PR c++/28370 * decl2.c (note_vague_linkage_var): Removed. (finish_static_data_member_decl): Add decl to pending_statics vector directly. Do it even for non-public decls. * g++.dg/template/anon3.C: New test. Added: trunk/gcc/testsuite/g++.dg/template/anon3.C Modified: trunk/gcc/cp/ChangeLog trunk/gcc/cp/decl2.c trunk/gcc/testsuite/ChangeLog
Fixed.
Subject: Bug 28370 Author: jakub Date: Mon Aug 28 12:28:55 2006 New Revision: 116506 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=116506 Log: PR c++/28370 * decl2.c (note_vague_linkage_var): Removed. (finish_static_data_member_decl): Add decl to pending_statics vector directly. Do it even for non-public decls. * g++.dg/template/anon3.C: New test. Added: branches/redhat/gcc-4_1-branch/gcc/testsuite/g++.dg/template/anon3.C Modified: branches/redhat/gcc-4_1-branch/gcc/ChangeLog branches/redhat/gcc-4_1-branch/gcc/cp/decl2.c branches/redhat/gcc-4_1-branch/gcc/testsuite/ChangeLog