Allow building the dump_syms tool on Windows

breakpad/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/symlink.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
+if (is_win) {
+  import("//build/config/win/visual_studio_version.gni")
+}
+
 config("tools_config") {
   include_dirs = [
     "src",
     "src/third_party",
   ]
   if (is_android) {
     defines = [ "__ANDROID__" ]
   }
   if (is_clang) {
     cflags = [ "-Wno-tautological-constant-out-of-range-compare" ]
@@ skipping 793 matching lines @@
 
     deps = [
       ":client",
       "//build/config/sanitizers:deps",
     ]
 
     include_dirs = [ "src" ]
   }
 }
 
+if (is_win) {
+  executable("dump_syms") {
+    # TODO(scottmg) using this with VS2015 may break the crash server.
+    # https://crbug.com/696671
+    include_dirs = [
+      "$visual_studio_path/DIA SDK/include",
+      "src",
+    ]
+
+    sources = [
+      "src/common/windows/dia_util.cc",
+      "src/common/windows/dia_util.h",
+      "src/common/windows/guid_string.cc",
+      "src/common/windows/guid_string.h",
+      "src/common/windows/omap.cc",
+      "src/common/windows/omap.h",
+      "src/common/windows/pdb_source_line_writer.cc",
+      "src/common/windows/pdb_source_line_writer.h",
+      "src/common/windows/string_utils-inl.h",
+      "src/common/windows/string_utils.cc",
+      "src/tools/windows/dump_syms/dump_syms.cc",
+    ]
+
+    lib_dirs = []
+    if (target_cpu == "x64") {
+      lib_dirs += [ "$visual_studio_path/DIA SDK/lib/amd64" ]
+    } else {
+      lib_dirs += [ "$visual_studio_path/DIA SDK/lib" ]
+    }
+
+    libs = [
+      "diaguids.lib",
+      "imagehlp.lib",
+    ]
+    if (is_clang) {
+      # clang complains about microsoft-specific goto extensions. Instead of
+      # rewriting decade-old, goto-ridden code, disable the warning.
+      cflags = [ "-Wno-microsoft-goto" ]
+    }
+  }
+}
+
 if (is_ios) {
   static_library("client") {
     set_sources_assignment_filter([])
     sources = [
       "src/client/ios/Breakpad.h",
       "src/client/ios/Breakpad.mm",
       "src/client/ios/BreakpadController.h",
       "src/client/ios/BreakpadController.mm",
       "src/client/ios/handler/ios_exception_minidump_generator.h",
       "src/client/ios/handler/ios_exception_minidump_generator.mm",
@@ skipping 106 matching lines @@
 
 if (is_android) {
   # TODO(GYP_GONE) Delete this after we've converted everything to GN.
   group("breakpad_unittests_deps") {
     testonly = true
     deps = [
       ":breakpad_unittests",
     ]
   }
 }