Fix script and compiler invocation when using non-default toolchain.

build/config/ios/rules.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/ios/ios_sdk.gni")
 import("//build/config/mac/base_rules.gni")
 
 # Generates Info.plist files for Mac apps and frameworks.
 #
 # Arguments
@@ skipping 154 matching lines @@
                              "data_deps",
                              "entitlements_path",
                              "info_plist",
                              "info_plist_target",
                              "output_name",
                              "product_type",
                              "visibility",
                            ])
 
     output_name = rebase_path("$target_gen_dir/$_output_name", root_out_dir)
+    output_prefix_override = true
+
     if (!defined(libs)) {
       libs = []
     }
     libs += [ "UIKit.framework" ]
     if (!defined(ldflags)) {
       ldflags = []
     }
     ldflags += [ "-ObjC" ]
   }
 
@@ skipping 256 matching lines @@
                                       "*.cc",
                                       "*.cpp",
                                       "*.m",
                                       "*.mm",
                                     ])
       sources = invoker.sources
       set_sources_assignment_filter([])
 
       args = [
                rebase_path(_header_map_filename),
-               rebase_path(_framework_root, root_out_dir),
-             ] + rebase_path(sources, root_out_dir)
+               rebase_path(_framework_root, root_build_dir),
+             ] + rebase_path(sources, root_build_dir)
     }
 
     _create_module_map_target = _target_name + "_module_map"
     action(_create_module_map_target) {
       visibility = [ ":$_framework_headers_target" ]
       script = "//build/config/ios/write_framework_modulemap.py"
       outputs = [
         "$_framework_root/Modules/module.modulemap",
       ]
-      args = [ rebase_path("$_framework_root", root_out_dir) ]
+      args = [ rebase_path("$_framework_root", root_build_dir) ]
     }
 
     _copy_public_headers_target = _target_name + "_copy_public_headers"
     copy(_copy_public_headers_target) {
       visibility = [ ":$_framework_headers_target" ]
       sources = _public_headers
       outputs = [
         "$_framework_root/Headers/{{source_file_part}}",
       ]
     }
@@ skipping 14 matching lines @@
         ":$_copy_public_headers_target",
         ":$_create_module_map_target",
       ]
     }
   }
 
   _framework_public_config = _target_name + "_ios_public_config"
   config(_framework_public_config) {
     visibility = [ ":$_framework_public_config" ]
     if (defined(_public_headers)) {
-      common_flags = [ "-F" + rebase_path("$root_out_dir/.", root_out_dir) ]
+      common_flags = [ "-F" + rebase_path("$root_out_dir/.", root_build_dir) ]
       cflags_objc = common_flags
       cflags_objcc = common_flags
     }
 
     # The link settings are inherited from the framework_bundle config.
   }
 
   framework_bundle(_framework_target) {
     forward_variables_from(invoker,
                            "*",
@@ skipping 51 matching lines @@
                              [
                                "testonly",
                                "visibility",
                              ])
       public_deps = [
         ":$_framework_target+link",
       ]
     }
   }
 }