Add dump_syms for DWARF symbols in a PECOFF image, as used by cygwin and mingw

src/tools/windows/dump_syms_dwarf/dump_syms.cc

Index: src/tools/windows/dump_syms_dwarf/dump_syms.cc
===================================================================
--- src/tools/windows/dump_syms_dwarf/dump_syms.cc	(revision 0)
+++ src/tools/windows/dump_syms_dwarf/dump_syms.cc	(working copy)
@@ -0,0 +1,88 @@
+// Copyright (c) 2011, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <stdio.h>
+
+#include <cstring>
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include "common/pecoff/dump_symbols.h"
+
+using google_breakpad::WriteSymbolFile;
+
+int usage(const char* self) {
+  fprintf(stderr, "Usage: %s [OPTION] <binary-with-dwarf-debugging-info> "
+          "[directories-for-debug-file]\n\n", self);
+  fprintf(stderr, "Options:\n");
+  fprintf(stderr, "  -c    Do not generate CFI section\n");
+  fprintf(stderr, "  -r    Do not handle inter-compilation unit references\n");
+  return 1;
+}
+
+int main(int argc, char **argv) {
+  if (argc < 2)
+    return usage(argv[0]);
+
+  bool cfi = true;
+  bool handle_inter_cu_refs = true;
+  int arg_index = 1;
+  while (arg_index < argc && strlen(argv[arg_index]) > 0 &&
+         argv[arg_index][0] == '-') {
+    if (strcmp("-c", argv[arg_index]) == 0) {
+      cfi = false;
+    } else if (strcmp("-r", argv[arg_index]) == 0) {
+      handle_inter_cu_refs = false;
+    } else {
+      return usage(argv[0]);
+    }
+    ++arg_index;
+  }
+  if (arg_index == argc)
+    return usage(argv[0]);
+
+  const char* binary;
+  std::vector<string> debug_dirs;
+  binary = argv[arg_index];
+  for (int debug_dir_index = arg_index + 1;
+       debug_dir_index < argc;
+       ++debug_dir_index) {
+    debug_dirs.push_back(argv[debug_dir_index]);
+  }
+
+  SymbolData symbol_data = cfi ? ALL_SYMBOL_DATA : NO_CFI;
+  google_breakpad::DumpOptions options(symbol_data, handle_inter_cu_refs);
+  if (!WriteSymbolFile(binary, debug_dirs, options, std::cout)) {
+    fprintf(stderr, "Failed to write symbol file.\n");
+    return 1;
+  }
+
+  return 0;
+}