Incremental linking setup for GN Windows build.

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/win/visual_studio_version.gni")
 
 # Compiler setup for the Windows SDK. Applied to all targets.
 config("sdk") {
   # The include path is the stuff returned by the script.
   #include_dirs = msvc_config[0]  TODO(brettw) make this work.
@@ skipping 88 matching lines @@
 
 config("console") {
   ldflags = [ "/SUBSYSTEM:CONSOLE" ]
 }
 config("windowed") {
   ldflags = [ "/SUBSYSTEM:WINDOWS" ]
 }
 
 # Incremental linking ----------------------------------------------------------
 
+incremental_linking_on_switch = [ "/INCREMENTAL" ]
+incremental_linking_off_switch = [ "/INCREMENTAL:NO" ]
+
+# Applies incremental linking or not depending on the current configuration.
+config("default_incremental_linking") {
+  if (is_debug) {
+    ldflags = incremental_linking_on_switch
+  } else {
+    ldflags = incremental_linking_off_switch
+  }
+}
+
+# Explicitly on or off incremental linking
 config("incremental_linking") {
-  ldflags = [ "/INCREMENTAL" ]
+  ldflags = incremental_linking_on_switch
 }
 config("no_incremental_linking") {
-  ldflags = [ "/INCREMENTAL:NO" ]
+  ldflags = incremental_linking_off_switch
+}
+
+# Some large modules can't handle incremental linking in some situations. This
+# config should be applied to large modules to turn off incremental linking
+# when it won't work.
+config("default_large_module_incremental_linking") {
+  if (!is_debug) {
+    # Default is always off in release build.
+    ldflags = incremental_linking_off_switch
+  } else if ((symbol_level == 0 || symbol_level == 1) &&
+             (current_cpu == "x86" || !is_component_build)) {
+    # When full symbols are on, don't do incremental linking for large modules
+    # on 32-bit or in non-component mode as the toolchain fails due to the size
+    # of the .ilk files.
+    ldflags = incremental_linking_off_switch
+  } else {
+    ldflags = incremental_linking_on_switch
+  }
 }
 
 # Character set ----------------------------------------------------------------
 
 # Not including this config means "ansi" (8-bit system codepage).
 config("unicode") {
   defines = [
     "_UNICODE",
     "UNICODE",
   ]
@@ skipping 10 matching lines @@
 
 # Nominmax --------------------------------------------------------------------
 
 # Some third party code defines NOMINMAX before including windows.h, which
 # then causes warnings when it's been previously defined on the command line.
 # For such targets, this config can be removed.
 
 config("nominmax") {
   defines = [ "NOMINMAX" ]
 }