Fix import/export annotations for v8 targets that are always static

test/unittests/BUILD.gn

 # Copyright 2016 The V8 project 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("../../gni/v8.gni")
 
 v8_executable("unittests") {
   testonly = true
 
   sources = [
@@ skipping 135 matching lines @@
     sources += [ "compiler/ppc/instruction-selector-ppc-unittest.cc" ]
   } else if (v8_current_cpu == "s390" || v8_current_cpu == "s390x") {
     sources += [ "compiler/s390/instruction-selector-s390-unittest.cc" ]
   }
 
   configs = [
     "../..:external_config",
     "../..:internal_config_base",
   ]
 
-  if (is_win) {
-    remove_configs = [ "//build/config/win:default_incremental_linking" ]
-    configs += [ "//build/config/win:no_incremental_linking" ]
-  }
-
   # TODO(machenbach): Translate from gyp.
   #['OS=="aix"', {
   #  'ldflags': [ '-Wl,-bbigtoc' ],
   #}],
 
   deps = [
     "../..:v8_libbase",
     "../..:v8_libplatform",
     "//build/config/sanitizers:deps",
     "//build/win:default_exe_manifest",
     "//testing/gmock",
     "//testing/gtest",
   ]
 
+  defines = []
+
   if (is_component_build) {
     # compiler-unittests can't be built against a shared library, so we
     # need to depend on the underlying static target in that case.
     deps += [ "../..:v8_maybe_snapshot" ]
+    defines += [ "BUILDING_V8_SHARED" ]
   } else {
     deps += [ "../..:v8" ]
   }
 
   if (is_win) {
     # This warning is benignly triggered by the U16 and U32 macros in
     # bytecode-utils.h.
     # C4309: 'static_cast': truncation of constant value
     cflags = [ "/wd4309" ]
-
-    # Suppress warnings about importing locally defined symbols.
-    if (is_component_build) {
-      ldflags = [
-        "/ignore:4049",
-        "/ignore:4217",
-      ]
-    }
   }
 }