Update build configuration to support iOS targets

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 0e28e7da8be6dce3e5b5d93500416c894b8513cd..18176e2c9b4bcec70bd5ad9129916a86918df386 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -125,7 +125,7 @@ config("compiler") {
     }
 
     # Linker warnings.
-    if (!(is_chromeos && current_cpu == "arm") && !is_mac) {
+    if (!(is_chromeos && current_cpu == "arm") && !is_mac && !is_ios) {
       # TODO(jochen): Enable this on chromeos on arm. http://crbug.com/356580
       ldflags += [ "-Wl,--fatal-warnings" ]
     }
@@ -186,6 +186,11 @@ config("compiler") {
         "-arch",
         "i386",
       ]
+    } else if (current_cpu == "arm") {
+      common_mac_flags += [
+        "-arch",
+        "armv7",
+      ]
     }
 
     cflags += common_mac_flags
@@ -493,7 +498,7 @@ config("compiler") {
 }
 
 config("compiler_arm_fpu") {
-  if (current_cpu == "arm") {
+  if (current_cpu == "arm" && !is_ios) {
     cflags = [ "-mfpu=$arm_fpu" ]
   }
 }