Only expose gflags target in non-Chromium and non-fuzzer builds.

third_party/gflags/BUILD.gn

 # Copyright (c) 2014 The WebRTC 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 in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
-if (is_win) {
-  gflags_gen_arch_root = "gen/win"
-} else {
-  gflags_gen_arch_root = "gen/posix"
-}
+import("../../webrtc/build/webrtc.gni")

[kjellander_webrtc, 2016/09/08 12:48:35]

Line 9-13 + 80 are the only added lines, the rest is indented existing code
(except for line 43).

 
-config("gflags_config") {
-  include_dirs = [
-    "$gflags_gen_arch_root/include",  # For configured files.
-    "src/src",  # For everything else.
-  ]
+# gflags can only be used by targets that are not built in Chromium, since
+# Chromium doesn't have gflags as a dependency).
+if (!build_with_chromium && !use_libfuzzer) {
+  if (is_win) {
+    gflags_gen_arch_root = "gen/win"
+  } else {
+    gflags_gen_arch_root = "gen/posix"
+  }
 
-  defines = [
-    # These macros exist so flags and symbols are properly exported when
-    # building DLLs. Since we don't build DLLs, we need to disable them.
-    "GFLAGS_DLL_DECL=",
-    "GFLAGS_DLL_DECLARE_FLAG=",
-    "GFLAGS_DLL_DEFINE_FLAG=",
-  ]
+  config("gflags_config") {
+    include_dirs = [
+      "$gflags_gen_arch_root/include",  # For configured files.
+      "src/src",  # For everything else.
+    ]
 
-  # GN orders flags on a target before flags from configs. The default config
-  # adds -Wall, and this flag have to be after -Wall -- so they need to
-  # come from a config and can't be on the target directly.
-  if (is_clang) {
-    cflags = [ "-Wno-unused-local-typedef" ]
+    defines = [
+      # These macros exist so flags and symbols are properly exported when
+      # building DLLs. Since we don't build DLLs, we need to disable them.
+      "GFLAGS_DLL_DECL=",
+      "GFLAGS_DLL_DECLARE_FLAG=",
+      "GFLAGS_DLL_DEFINE_FLAG=",
+    ]
+
+    # GN orders flags on a target before flags from configs. The default config
+    # adds -Wall, and this flag have to be after -Wall -- so they need to
+    # come from a config and can't be on the target directly.
+    if (is_clang) {
+      cflags = [ "-Wno-unused-local-typedef" ]
+    }
+  }
+
+  source_set("gflags") {
+    testonly = true

[kjellander_webrtc, 2016/09/08 12:48:35]

I added this too, doesn't hurt.

+    cflags = []
+    sources = [
+      "src/src/gflags.cc",
+      "src/src/gflags_completions.cc",
+      "src/src/gflags_reporting.cc",
+    ]
+    if (is_win) {
+      sources += [ "src/src/windows_port.cc" ]
+
+      cflags += [
+        "/wd4005",  # WIN32_LEAN_AND_MEAN.
+        "/wd4267",  # Conversion from size_t to "type".
+      ]
+    }
+
+    include_dirs = [
+      "$gflags_gen_arch_root/include/gflags",  # For configured files.
+      "$gflags_gen_arch_root/include/private",  # For config.h
+    ]
+
+    public_configs = [ ":gflags_config" ]
+
+    configs -= [ "//build/config/compiler:chromium_code" ]
+    configs += [ "//build/config/compiler:no_chromium_code" ]
+
+    if (is_win) {
+      configs -= [ "//build/config/win:unicode" ]
+    }
+
+    if (is_clang) {
+      # TODO(andrew): Look into fixing this warning upstream:
+      # http://code.google.com/p/webrtc/issues/detail?id=760
+      configs -= [ "//build/config/clang:extra_warnings" ]
+      cflags += [ "-Wno-microsoft-include" ]
+    }
   }
 }
-
-source_set("gflags") {
-  cflags = []
-  sources = [
-    "src/src/gflags.cc",
-    "src/src/gflags_completions.cc",
-    "src/src/gflags_reporting.cc",
-  ]
-  if (is_win) {
-    sources += [ "src/src/windows_port.cc" ]
-
-    cflags += [
-      "/wd4005",  # WIN32_LEAN_AND_MEAN.
-      "/wd4267",  # Conversion from size_t to "type".
-    ]
-  }
-
-  include_dirs = [
-    "$gflags_gen_arch_root/include/gflags",  # For configured files.
-    "$gflags_gen_arch_root/include/private",  # For config.h
-  ]
-
-  public_configs = [ ":gflags_config" ]
-
-  configs -= [ "//build/config/compiler:chromium_code" ]
-  configs += [ "//build/config/compiler:no_chromium_code" ]
-
-  if (is_win) {
-    configs -= [ "//build/config/win:unicode" ]
-  }
-
-  if (is_clang) {
-    # TODO(andrew): Look into fixing this warning upstream:
-    # http://code.google.com/p/webrtc/issues/detail?id=760
-    configs -= [ "//build/config/clang:extra_warnings" ]
-    cflags += [ "-Wno-microsoft-include" ]
-  }
-}