[build] Split v8_base on static-library builds on windows

Bug: v8:6461
Change-Id: Iafabf2d53aa6492b78a9e5ae683f010453bb195d
Reviewed-on: https://chromium-review.googlesource.com/533014Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45922}

BUILD.gn

@@ -1081,6 +1081,9 @@ v8_header_set("v8_headers") {
 v8_source_set("v8_base") {
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
+  # Split static libraries on windows into two.
+  split_count = 2
+
   sources = [
     "//base/trace_event/common/trace_event_common.h",
 

gni/v8.gni

@@ -4,6 +4,7 @@
 
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/v8_target_cpu.gni")
+import("//build/split_static_library.gni")
 
 declare_args() {
   # Includes files needed for correctness fuzzing.
@@ -91,20 +92,19 @@ if (is_posix && v8_enable_backtrace) {
 
 # All templates should be kept in sync.
 template("v8_source_set") {
-  if (defined(v8_static_library) && v8_static_library) {
-    static_library(target_name) {
-      forward_variables_from(invoker, "*", [ "configs" ])
-      configs += invoker.configs
-      configs -= v8_remove_configs
-      configs += v8_add_configs
-    }
+  if (defined(invoker.split_count) && invoker.split_count > 1 &&
+      defined(v8_static_library) && v8_static_library && is_win) {
+    link_target_type = "split_static_library"
+  } else if (defined(v8_static_library) && v8_static_library) {
+    link_target_type = "static_library"
   } else {
-    source_set(target_name) {
-      forward_variables_from(invoker, "*", [ "configs" ])
-      configs += invoker.configs
-      configs -= v8_remove_configs
-      configs += v8_add_configs
-    }
+    link_target_type = "source_set"
+  }
+  target(link_target_type, target_name) {
+    forward_variables_from(invoker, "*", [ "configs" ])
+    configs += invoker.configs
+    configs -= v8_remove_configs
+    configs += v8_add_configs
   }
 }