[LLVMbugs] [Bug 17480] New: __attribute__((used)) ignored in templated classes

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17480

            Bug ID: 17480
           Summary: __attribute__((used)) ignored in templated classes
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows XP
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: llvm at meinersbur.de
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Test program test.cpp:

    static __attribute__((used)) void Afunc() {}

    class testclass2 {
        __attribute__((used)) void Bfunc() {}
    };
    testclass2 xxx;

    template<typename T>
    class testclass3 {
       __attribute__((used)) void Cfunc() {}
    };
    testclass3<int> yyy;


> clang test.cpp -c -o test.obj
> nm test.obj

00000000 b .bss
00000000 d .data
00000000 t .text
00000000 t .text$_ZN10testclass25BfuncEv
00000000 t __ZL5Afuncv
00000000 T __ZN10testclass25BfuncEv
00000000 B _xxx
00000001 B _yyy


I expected to see the mangled name of funcC ("__ZN10testclass25CfuncEv") as
well in the object file. Same result with explicit instantiation instead of
using it:

    template class testclass3<int>;


The culprit seems to be in CodeGeneratorImpl::HandleTagDeclDefinition(). It
calls Method->doesThisDeclarationHaveABody(), but the body is not instantiated
until the end of the translation unit when Sema::PerformPendingInstantiations()
get called.

Using clang r191953 on Windows 7 targeting i686-pc-mingw32

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20131004/1cdb7061/attachment.html>