PNaCl: Add more MIPS support to the toolchain

pnacl/driver/pnacl-nativeld.py

 #!/usr/bin/python
 # Copyright (c) 2012 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 #
 # This is a thin wrapper for native LD. This is not meant to be
 # used by the user, but is called from pnacl-translate.
 # This implements the native linking part of translation.
 #
@@ skipping 74 matching lines @@
   'NEEDED_LIBRARIES': '',
 
   'EMITMODE'         : '${RELOCATABLE ? relocatable : ' +
                        '${STATIC ? static : ' +
                        '${SHARED ? shared : dynamic}}}',
 
   'LD_EMUL'        : '${LD_EMUL_%ARCH%}',
   'LD_EMUL_ARM'    : 'armelf_nacl',
   'LD_EMUL_X8632'  : 'elf_nacl',
   'LD_EMUL_X8664'  : 'elf64_nacl',
+  'LD_EMUL_MIPS32' : 'elf32ltsmip_nacl',
 
   'SEARCH_DIRS'        : '${SEARCH_DIRS_USER} ${SEARCH_DIRS_BUILTIN}',
   'SEARCH_DIRS_USER'   : '',
   'SEARCH_DIRS_BUILTIN': '${STDLIB ? ${LIBS_ARCH}/}',
 
   'LIBS_ARCH'        : '${LIBS_%ARCH%}',
   'LIBS_ARM'         : '${BASE_LIB_NATIVE}arm',
   'LIBS_X8632'       : '${BASE_LIB_NATIVE}x86-32',
   'LIBS_X8664'       : '${BASE_LIB_NATIVE}x86-64',
+  'LIBS_MIPS32'      : '${BASE_LIB_NATIVE}mips32',
 
   # Note: this is only used in the unsandboxed case
   'RUN_LD' : '${LD} ${LD_FLAGS} ${inputs} -o ${output}' +
              '${#METADATA_FILE ? --metadata ${METADATA_FILE}}',
 }
 
 def PassThrough(*args):
   env.append('LD_FLAGS', *args)
 
 LDPatterns = [
@@ skipping 207 matching lines @@
 def LinkerFiles(args):
   ret = []
   for f in args:
     if IsFlag(f):
       continue
     else:
       if not pathtools.exists(f):
         Log.Fatal("Unable to open '%s'", pathtools.touser(f))
       ret.append(f)
   return ret