Update gtest template, require stdlib on linux

scripts/generate_workspace.py

@@ -63,10 +63,10 @@ def print_gtest_workspace():
 # GTest
 new_http_archive(
   name = "gtest",
-  url = "https://github.com/google/googletest/archive/release-1.7.0.zip",
-  sha256 = "b58cb7547a28b2c718d1e38aee18a3659c9e3ff52440297e965f5edffe34b6d0",
+  url = "https://github.com/google/googletest/archive/release-1.8.0.zip",
+  sha256 = "f3ed3b58511efd272eb074a3a6d6fb79d7c2e6a0e374323d1e6bcbcc1ef141bf",
   build_file = "gtest.BUILD",
-  strip_prefix = "googletest-release-1.7.0",
+  strip_prefix = "googletest-release-1.8.0/googletest",
 )
 """
 

src/BUILD

@@ -1,8 +1,18 @@
+config_setting(
+    name = "darwin_mode",
+    values = {"cpu": "darwin"},
+)
+
 cc_test(
   name = 'test',
   srcs = glob(['*_test.cpp']),
   copts = ['-Iexternal/gtest/include'],
   deps = [
     '@gtest//:main',
-  ],
+  ] + + select({
+    ':darwin_mode;: [], 
+    '//conditions:default': [
+      '@org_chromium_libcxx//:libcxx',
+    ],
+  }),
 )