Create a build_config header file.

build/untrusted.gypi

 # Copyright (c) 2011 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.
 
 {
   'variables': {
     'variables': {
       # Enable -Werror by default, but put it in a variable so it can
       # be optionally disabled.
       'werror%': '-Werror',
@@ skipping 92 matching lines @@
           'tc_include_dir_glibc': '<(SHARED_INTERMEDIATE_DIR)/tc_glibc/include',
           'extra_deps': [],
           'extra_deps_newlib64': [],
           'extra_deps_newlib32': [],
           'extra_deps_glibc64': [],
           'extra_deps_glibc32': [],
           'extra_deps_newlib32_nonsfi': [],
           'include_dirs': ['<(DEPTH)'],
           'defines': [
             '<@(nacl_default_defines)',
-            'NACL_BUILD_ARCH=x86',
           ],
           'sources': [],
           'link_flags': [],
           # X86-32 IRT needs to be callable with an under-aligned stack so we
           # disable SSE instructions, which can fault on misaligned addresses:
           # see https://code.google.com/p/nativeclient/issues/detail?id=3935
           'irt_flags_x86_32': '-Wt,-mattr=-sse',
         },
       },
     }],
@@ skipping 32 matching lines @@
           'nacl_newlib_tc_root': '<(SHARED_INTERMEDIATE_DIR)/sdk/<(TOOLCHAIN_OS)_x86/nacl_arm_newlib',
           'tc_lib_dir_bionic_arm': '<(SHARED_INTERMEDIATE_DIR)/tc_bionic/libarm',
           'tc_lib_dir_newlib_arm': '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/libarm',
           'tc_lib_dir_irt_arm': '<(SHARED_INTERMEDIATE_DIR)/tc_irt/libarm',
           'tc_lib_dir_nonsfi_helper_arm': '<(SHARED_INTERMEDIATE_DIR)/tc_nonsfi_helper/libarm',
           'tc_include_dir_newlib': '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/include',
           'tc_include_dir_bionic': '<(SHARED_INTERMEDIATE_DIR)/tc_bionic/include',
           'include_dirs': ['<(DEPTH)'],
           'defines': [
             '<@(nacl_default_defines)',
-            'NACL_BUILD_ARCH=arm',
            ],
            'sources': [],
            'link_flags': [],
          },
        },
     }],
     ['target_arch=="mipsel"', {
       # Common defaults for all mips pnacl-clang targets
       'target_defaults': {
         'defines': [],
@@ skipping 22 matching lines @@
           'extra_deps_newlib_mips': [],
           'native_sources': [],
           'nacl_glibc_tc_root': '<(SHARED_INTERMEDIATE_DIR)/sdk/<(TOOLCHAIN_OS)_x86/nacl_mips_glibc',
           'nacl_newlib_tc_root': '<(SHARED_INTERMEDIATE_DIR)/sdk/<(TOOLCHAIN_OS)_x86/nacl_mips_newlib',
           'tc_lib_dir_newlib_mips': '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/libmips',
           'tc_lib_dir_irt_mips': '<(SHARED_INTERMEDIATE_DIR)/tc_irt/libmips',
           'tc_include_dir_newlib': '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/include',
           'include_dirs': ['<(DEPTH)'],
           'defines': [
             '<@(nacl_default_defines)',
-            'NACL_BUILD_ARCH=mips',
            ],
            'sources': [],
            'link_flags': [],
          },
        },
     }],
     ['target_arch=="ia32" or target_arch=="x64"', {
       'target_defaults': {
         # x86-64 newlib nexe action
         'target_conditions': [
@@ skipping 1571 matching lines @@
                 ],
               },
             ],
           }],
         ],
       }], # end MIPS
       # end pnacl actions for building ABI-biased native libraries
     ], # end conditions for pnacl biased nlib
   },
 }