GN build fixes, mostly for Mac.

build/config/compiler/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/android/config.gni")
 import("//build/config/sysroot.gni")
 if (cpu_arch == "arm") {
   import("//build/config/arm.gni")
 }
 
@@ skipping 43 matching lines @@
     # Stack protection.
     if (is_mac) {
       cflags += [ "-fstack-protector-all" ]
     } else if (is_linux) {
       cflags += [ "-fstack-protector", "--param=ssp-buffer-size=4" ]
     }
   }
 
   # Mac-specific compiler flags setup.
   # ----------------------------------
-  if (is_mac) {
+  if (is_mac || is_ios) {
     # These flags are shared between the C compiler and linker.
-    common_mac_flags = [
-      "-isysroot", sysroot,
-      "-mmacosx-version-min=10.6",
-    ]
+    common_mac_flags = [ "-isysroot", sysroot ]
+    if (is_mac) {
+      common_mac_flags += [ "-mmacosx-version-min=10.6" ]
+    } else {
+      cflags += [ "-mios-simulator-version-min=6.0" ]

[Nico, 2014/01/27 19:42:27]

I'm not sure if this is good enough: While the ios ninja build currently only
supports simulator builds, the xcode build supports real device builds too – so
setting the simulator flag there won't be correct.

+    }
 
     # CPU architecture.
     if (cpu_arch == "x64") {
       common_mac_flags += [ "-arch x86_64" ]
     } else if (cpu_arch == "x86") {
       common_mac_flags += [ "-arch i386" ]
     }
 
     cflags += common_mac_flags + [
       # Without this, the constructors and destructors of a C++ object inside
@@ skipping 599 matching lines @@
     cflags = [ "-g1" ]
   }
 }
 
 config("no_symbols") {
   if (!is_win) {
     cflags = [ "-g0" ]
   }
 }