[Chromecast] Use symbol_level=1 for 32-bit GCC toolchains.

build/config/compiler/compiler.gni

 # Copyright 2015 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/android/config.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/pgo/pgo.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/toolchain/goma.gni")
@@ skipping 48 matching lines @@
 declare_args() {
   # Whether to use the gold linker from binutils instead of lld or bfd.
   use_gold = !use_lld && !(is_chromecast && is_linux &&
                            (current_cpu == "arm" || current_cpu == "mipsel")) &&
              ((is_linux && (current_cpu == "x64" || current_cpu == "x86" ||
                             current_cpu == "arm" || current_cpu == "mipsel")) ||
               (is_android && (current_cpu == "x86" || current_cpu == "x64" ||
                               current_cpu == "arm" || current_cpu == "arm64")))
 }
 
+# True if the target platform is a 64-bit architecture.
+is_target_cpu_64bit =
+    target_cpu == "x64" || target_cpu == "arm64" || target_cpu == "mips64el"
+if (!is_target_cpu_64bit) {
+  # Assert so that this variable is updated as new architectures are added.
+  assert(target_cpu == "x86" || target_cpu == "arm" || target_cpu == "mipsel",
+         "$target_cpu is not a supported architecture.")
+}
+
 # If it wasn't manually set, set to an appropriate default.
 assert(symbol_level >= -1 && symbol_level <= 2, "Invalid symbol_level")
 if (symbol_level == -1) {
   if (is_android && use_order_profiling) {
     # With instrumentation enabled, debug info puts libchrome.so over 4gb, which
     # causes the linker to produce an invalid ELF. http://crbug.com/574476
     symbol_level = 0
-  } else if (is_android && !is_component_build && !is_clang &&
-             !(android_64bit_target_cpu && !build_apk_secondary_abi)) {
+  } else if (!is_component_build && !is_clang && ((is_chromecast &&
+                                                   !is_target_cpu_64bit) ||
+                                                  (is_android &&
+                                                   (!is_target_cpu_64bit ||
+                                                    build_apk_secondary_abi)))) {
     # Reduce symbol level when it will cause invalid elf files to be created
-    # (due to file size). https://crbug.com/648948.
+    # (due to file size): https://crbug.com/648948, https://crbug.com/670776
     symbol_level = 1
   } else if (is_win && use_goma && !is_clang) {
     # goma doesn't support PDB files, so we disable symbols during goma
     # compilation because otherwise the redundant debug information generated
     # by visual studio (repeated in every .obj file) makes linker
     # memory consumption and link times unsustainable (crbug.com/630074).
     # Clang on windows does not have this issue.
     symbol_level = 1
   } else if (!is_linux || is_debug || is_official_build || is_chromecast) {
     # Linux is slowed by having symbols as part of the target binary, whereas
     # Mac and Windows have them separate, so in Release Linux, default them off,
     # but keep them on for Official builds and Chromecast builds.
     symbol_level = 2
   } else if (using_sanitizer) {
     # Sanitizers require symbols for filename suppressions to work.
     symbol_level = 1
   } else {
     symbol_level = 0
   }
 }
 
 # Assert that the configuration isn't going to hit https://crbug.com/648948.
-assert(ignore_elf32_limitations || !is_android ||
-           (android_64bit_target_cpu && !build_apk_secondary_abi) ||
-           is_component_build || symbol_level < 2 || is_clang,
-       "Android 32-bit non-component, non-clang builds cannot have " +
-           "symbol_level=2 due to 4GiB file size limit, see " +
+assert(ignore_elf32_limitations || is_component_build || symbol_level < 2 ||
+           is_clang ||
+           !(is_android && (!is_target_cpu_64bit || build_apk_secondary_abi)) ||
+           !(is_chromecast && !is_target_cpu_64bit),
+       "Android and Chromecast 32-bit non-component, non-clang builds cannot " +
+           "have symbol_level=2 due to 4GiB file size limit, see " +
            "https://crbug.com/648948. If you really want to try this out, " +
            "set ignore_elf32_limitations=true.")