- recent gdb handles DWARF fine (tested both with version
7.1.90.20100730 from mingw-w64 project, and 7.5-1 from mingw project)
- http://people.freedesktop.org/~jrfonseca/bfdhelp/ was updated to
handle DWARF
- stabs requires ugly hacks to prevent compilation failures
- mixing stabs/dwarf prevents proper backtraces (which is inevitable,
given that the MinGW C runtime is pre-built with DWARF)
For example, without this change I get:
(gdb) bt
#0 _wassert (_Message=0xf925060 L"Num < NumOperands && \"Invalid child # of SDNode!\"",
_File=0xf60b488 L"llvm/include/llvm/CodeGen/SelectionDAGNodes.h", _Line=534)
at ../../../../mingw-w64-crt/misc/wassert.c:51
#1 0x0368996b in _assert (_Message=0x39d7ee4 "Num < NumOperands && \"Invalid child # of SDNode!\"",
_File=0x39d7e94 "llvm/include/llvm/CodeGen/SelectionDAGNodes.h", _Line=534)
at ../../../../mingw-w64-crt/misc/wassert.c:44
#2 0x00000004 in ?? ()
#3 0x00000004 in ?? ()
#4 0x0f60b488 in ?? ()
#5 0x00000000 in ?? ()
While with this change I get:
(gdb) bt
#0 _wassert (_Message=0xfb982e8 L"Num < NumOperands && \"Invalid child # of SDNode!\"",
_File=0xefbcb40 L"llvm/include/llvm/CodeGen/SelectionDAGNodes.h", _Line=534)
at ../../../../mingw-w64-crt/misc/wassert.c:51
#1 0x039c996b in _assert (_Message=0x3d17f24 "Num < NumOperands && \"Invalid child # of SDNode!\"",
_File=0x3d17ed4 "llvm/include/llvm/CodeGen/SelectionDAGNodes.h", _Line=534)
at ../../../../mingw-w64-crt/misc/wassert.c:44
#2 0x033111cc in getOperand (Num=4, this=<optimized out>)
at llvm/include/llvm/CodeGen/SelectionDAGNodes.h:534
#3 getOperand (i=4, this=<optimized out>)
at llvm/include/llvm/CodeGen/SelectionDAGNodes.h:779
#4 llvm::SelectionDAG::getNode (this=0xf00cb08, Opcode=79, DL=..., VT=..., N1=..., N2=...)
at llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:2859
#5 0x03377b20 in llvm::SelectionDAGBuilder::visitExtractElement (this=0xfb45028, I=...)
at llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:2803
[...]
Reviewed-by: Brian Paul <brianp@vmware.com>
8cabc7be1d