[LLVMbugs] [Bug 14610] New: Clang emits debug info for multiple (at least D1 and D2) dtor functions

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Dec 14 09:54:17 PST 2012


             Bug #: 14610
           Summary: Clang emits debug info for multiple (at least D1 and
                    D2) dtor functions
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: googler
          Severity: enhancement
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: dblaikie at gmail.com
                CC: dgregor at apple.com, echristo at gmail.com,
                    llvmbugs at cs.uiuc.edu
            Blocks: 14330
    Classification: Unclassified

Reduced from the GDB 7.5 test gdb.cp/mb-ctor.cc:

#include <cstdio>
struct Base {
  ~Base() {

struct Derived : virtual Base {

Derived::~Derived() {

int main() {
  Derived d;

breaking on "Derived::~Derived()" in GDB with Clang debug info causes this
program to break twice. With GCC's debug info the program only breaks once.

>From the DWARF dump it looks like Clang is emitting debug info
(DW_TAG_subprogram and line table entries) for both the D1 and D2 version of
the function, both with a DW_AT_specification of the DW_TAG_subprogram named
"~Derived". I assume this is why GDB breaks twice. 

I can't quite do a direct comparison to GCC & see which function it's emitted
debug info for because it seems to have inlined the dtor call, even at -O0, so
I can't match it to a particular exported symbol.

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