scons: Don't force stabs debug format for Mingw.

- 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 <[email protected]>

1 files changed, 0 insertions, 5 deletions

diff --git a/src/mapi/glapi/SConscript b/src/mapi/glapi/SConscript
index ac11148ffcf..c4ac080aaa8 100644
--- a/src/mapi/glapi/SConscript
+++ b/src/mapi/glapi/SConscript
@@ -95,11 +95,6 @@ if (env['gcc'] or env['clang']) and \
     else:
         pass
 
-if env['toolchain'] == 'crossmingw':
-    # compile these files without -gstabs option
-    glapi_sources = env.compile_without_gstabs(glapi_sources, "glapi_dispatch.c")
-    glapi_sources = env.compile_without_gstabs(glapi_sources, "glapi_getproc.c")
-
 glapi = env.ConvenienceLibrary(
     target = 'glapi',
     source = glapi_sources,