[LLVMbugs] [Bug 13942] New: Clang doesn't emit debug info for _GLOBAL__I_a

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=13942

             Bug #: 13942
           Summary: Clang doesn't emit debug info for _GLOBAL__I_a
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: samsonov at google.com
                CC: echristo at gmail.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Clang doesn't emit debug info entry for __GLOBAL__I_a function that calls
constructors for global objects.

$ cat a.cc 
class A {
 public:
  A() { val_ = 42; }
  int val_;
};

A glob;

int main() {
  return glob.val_;
}
$ clang++ -g a.cc
$ objdump -d a.out | grep "_GLOBAL__I_a"
0000000000400570 <_GLOBAL__I_a>:
$ readelf -wi a.out | grep "_GLOBAL__I_a"
$

g++ does this:
$ g++ -g a.cc
$ objdump -d a.out | grep "_GLOBAL__"
00000000004004e9 <_GLOBAL__sub_I_glob>:
$ readelf -wi a.out | grep "_GLOBAL__"
    <10d>   DW_AT_name        : (indirect string, offset: 0x0):
_GLOBAL__sub_I_glob

This DIE is important when we build address range table (a list of instruction
address ranges for each compile unit). If DIE for _GLOBAL__I_a is not a child
of corresponding CompileUnit DIE, then its instructions will not be considered.

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