[LLVMbugs] [Bug 700] NEW: [llvm-g++] Templates instantiated on internal classes should be internal

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=700

           Summary: [llvm-g++] Templates instantiated on internal classes
                    should be internal
           Product: tools
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: minor
          Priority: P2
         Component: llvm-g++
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sabre at nondot.org


Consider:

---
template <typename foo>
void bar() {}

namespace { class C {};}
void (*FP)() = bar<C>;
---

Because C is in an anonymous namespace, there is no reason for the template instantiation of bar here 
to be marked linkonce.  Instead, it should be marked internal, allowing IPO at compile time.

We currently compile it to:

---
%FP = global void ()* %_Z3barIN11_GLOBAL__N_1CEEvv              ; <void ()**> [#uses=0]

linkonce void %_Z3barIN11_GLOBAL__N_1CEEvv() {
        ret void
}
---

This occurs with pass registration functions in LLVM, which are templates instantiated on mostly 
internal classes.

-Chris



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