clang/win: Disable incremental linking.

build/config/win/BUILD.gn

 # Copyright (c) 2013 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/config/compiler/compiler.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/win/visual_studio_version.gni")
 
 assert(is_win)
 
@@ skipping 281 matching lines @@
   ldflags = [ "/SUBSYSTEM:CONSOLE$subsystem_version_suffix" ]
 }
 config("windowed") {
   ldflags = [ "/SUBSYSTEM:WINDOWS$subsystem_version_suffix" ]
 }
 
 # Incremental linking ----------------------------------------------------------
 
 incremental_linking_on_switch = [ "/INCREMENTAL" ]
 incremental_linking_off_switch = [ "/INCREMENTAL:NO" ]
-if (is_debug) {
+
+# MSVC2015's incremental linker complains about clang's .obj files sometimes,
+# https://crbug.com/595702.  Disable incremental linking with clang for now.
+# TODO(thakis): Remove this once that problem is fixed, or when the win_clang
+# bot uses lld.
+if (is_debug && !is_clang) {
   default_incremental_linking_switch = incremental_linking_on_switch
 } else {
   default_incremental_linking_switch = incremental_linking_off_switch
 }
 
 # Applies incremental linking or not depending on the current configuration.
 config("default_incremental_linking") {
   ldflags = default_incremental_linking_switch
 }
 
@@ skipping 65 matching lines @@
 
 # Internal stuff --------------------------------------------------------------
 
 # Config used by the MIDL template to disable warnings.
 config("midl_warnings") {
   if (is_clang) {
     # MIDL generates code like "#endif !_MIDL_USE_GUIDDEF_".
     cflags = [ "-Wno-extra-tokens" ]
   }
 }