Pass -Oz flag to Clang when targeting Android.

third_party/expat/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/chromecast_build.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 
 # On Linux, we implicitly already depend on expat via fontconfig;
 # let's not pull it in twice.
 # Chromecast doesn't ship expat as a system library.
@@ skipping 15 matching lines @@
   static_library("expat") {
     sources = [
       "files/lib/expat.h",
       "files/lib/xmlparse.c",
       "files/lib/xmlrole.c",
       "files/lib/xmltok.c",
     ]
 
     public_configs = [ ":expat_config" ]
 
+    # TODO(thakis): Remove this once clang no longer crashes when building
+    # libexpat with -Oz.

[Nico, 2017/05/24 15:33:35]

(I checked that this no longer happens with trunk clang.)

+    configs -= [ "//build/config/compiler:default_optimization" ]
+    configs += [ "//build/config/compiler:optimize_max" ]
+
     defines = [ "_LIB" ]
     if (is_win) {
       defines += [ "COMPILED_FROM_DSP" ]
     } else {
       defines += [ "HAVE_EXPAT_CONFIG_H" ]
     }
   }
 }
 
 fuzzer_test("expat_xml_parse_fuzzer") {
   sources = [
     "fuzz/expat_xml_parse_fuzzer.cc",
   ]
   deps = [
     ":expat",
   ]
   dict = "//testing/libfuzzer/fuzzers/dicts/xml.dict"
 }