[LLVMbugs] [Bug 12476] New: "ld: warning: can't add line info to anonymous symbol cstring=SetTraceFilter" when building with -O3 -g in a class with 8 virtual bases

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12476

             Bug #: 12476
           Summary: "ld: warning: can't add line info to anonymous symbol
                    cstring=SetTraceFilter" when building with -O3 -g in a
                    class with 8 virtual bases
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nicolasweber at gmx.de
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 8332
  --> http://llvm.org/bugs/attachment.cgi?id=8332
repro

ld warns when compiling the (pretty reduced) attached file:

$ clang++ -w -c repro.ii  -arch i386 -gdwarf-2 -O3 -fno-exceptions && \
  clang++ -shared -o libfoo.dylib repro.o -arch i386 \
      -undefined dynamic_lookup -gdwarf-2 
ld: warning: can't add line info to anonymous symbol
cstring=SetTraceFilter(filter=0x%x) from repro.o


This is with this ld:

$ ld -v
@(#)PROGRAM:ld  PROJECT:ld64-97.17


This does not happen with g++ (i686-apple-darwin10-g++-4.2.1 (GCC) 4.2.1 (Apple
Inc. build 5664).

I hear that ld warning might no longer exist with newer ld64s (haven't checked
though), but it might point at a debug information bug none the less.

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