Fix compilation of //third_party/nss with gn on iOS.

build/secondary/third_party/nss/BUILD.gn

 # Copyright 2014 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/linux/pkg_config.gni")
 
 if (is_linux) {
   # This is a dependency on NSS with no libssl. On Linux we use a built-in SSL
   # library but the system NSS libraries. Non-Linux platforms using NSS use the
   # hermetic one in //third_party/nss.
@@ skipping 456 matching lines @@
       "nss/lib/nss",
       "nss/lib/pk11wrap",
       "nss/lib/pkcs7",
       "nss/lib/pki",
       "nss/lib/smime",
       "nss/lib/softoken",
       "nss/lib/util",
     ]
   }
 
+  config("nss_static_config_private") {
+    if (is_clang) {
+      cflags = [
+        # nss doesn"t explicitly cast between different enum types.
+        "-Wno-conversion",
+
+        # nss passes "const char*" through "void*".
+        "-Wno-incompatible-pointer-types",
+
+        # nss prefers `a && b || c` over `(a && b) || c`.
+        "-Wno-logical-op-parentheses",
+
+        # nss doesn"t use exhaustive switches on enums
+        "-Wno-switch",
+
+        # nss has some `unsigned < 0` checks.
+        "-Wno-tautological-compare",
+
+        # nss-urandom-abort.patch removed the only call to rng_systemFromNoise
+        "-Wno-unused-function",
+      ]
+    }
+  }
+
   if (is_win && current_cpu == "x86") {
     source_set("nss_static_avx") {
       sources = [
         "nss/lib/freebl/intel-gcm-wrap.c",
         "nss/lib/freebl/intel-gcm-x86-masm.asm",
         "nss/lib/freebl/intel-gcm.h",
       ]
       defines = [
         "_WINDOWS",
         "_X86_",
@@ skipping 397 matching lines @@
     configs -= [ "//build/config/compiler:chromium_code" ]
     if (is_win) {
       configs -= [ "//build/config/win:unicode" ]  # Requires 8-bit mode.
     }
     configs += [
       "//build/config/compiler:no_chromium_code",
       "//build/config/compiler:no_size_t_to_int_warning",
 
       # nss passes "const char*" through "void*".
       "//build/config/compiler:no_incompatible_pointer_warnings",
+      ":nss_static_config_private",
     ]
     public_configs = [ ":nss_static_config" ]
 
     cflags = []
 
     # Only need the defines and includes not in nss_static_config.
     defines = [
       "MP_API_COMPATIBLE",
       "NSS_DISABLE_DBM",
       "RIJNDAEL_INCLUDE_TABLES",
@@ skipping 272 matching lines @@
       }
     } else {
       # Not Windows.
       sources -= [
         # mpi_x86_asm.c contains MSVC inline assembly code.
         "nss/lib/freebl/intel-aes-x86-masm.asm",
         "nss/lib/freebl/mpi/mpi_x86_asm.c",
       ]
     }
 
-    if (is_clang) {
-      cflags += [
-        # nss doesn"t explicitly cast between different enum types.
-        "-Wno-conversion",
-
-        # nss passes "const char*" through "void*".
-        "-Wno-incompatible-pointer-types",
-
-        # nss prefers `a && b || c` over `(a && b) || c`.
-        "-Wno-logical-op-parentheses",
-
-        # nss doesn"t use exhaustive switches on enums
-        "-Wno-switch",
-
-        # nss has some `unsigned < 0` checks.
-        "-Wno-tautological-compare",
-
-        # nss-urandom-abort.patch removed the only call to rng_systemFromNoise
-        "-Wno-unused-function",
-      ]
-    }
-
     public_deps = [
       ":nspr",
     ]
     deps = [
       ":nspr",
       "//third_party/sqlite",
     ]
 
     if (is_win && current_cpu == "x86") {
       deps += [ ":nss_static_avx" ]
     }
   }
 }  # Windows/Mac/iOS.