Support for ARM NaCl untrusted runtime build.

ppapi/native_client/native_client.gyp

 # 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.
 
 {
   'includes': [
     '../../native_client/build/common.gypi',
   ],
   'conditions': [
     ['disable_nacl==0 and disable_nacl_untrusted==0', {
@@ skipping 11 matching lines @@
               'files': [
                   '<(DEPTH)/native_client/src/untrusted/irt_stub/libppapi.a',
               ],
             },
             {
               'destination': '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib64',
               'files': [
                   '<(DEPTH)/native_client/src/untrusted/irt_stub/libppapi.a',
               ],
             },
+            {
+              'destination': '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/libarm',
+              'files': [
+                '<(DEPTH)/native_client/src/untrusted/irt_stub/libppapi.a',
+              ],
+            },
           ],
         },
         {
           'target_name': 'nacl_irt',
           'type': 'none',
           'variables': {
             'nexe_target': 'nacl_irt',
             'out64': '<(PRODUCT_DIR)/nacl_irt_x86_64.nexe',
             'out32': '<(PRODUCT_DIR)/nacl_irt_x86_32.nexe',
+            'out_arm': '<(PRODUCT_DIR)/nacl_irt_arm.nexe',
             'build_glibc': 0,
             'build_newlib': 1,
             'include_dirs': [
               'lib/gl/include',
               '..',
             ],
             # Link offsets taken from native_client/build/untrusted.gypi

[Mark Seaborn, 2012/03/30 16:42:46]

I think this comment is about NACL_IRT_DATA_START/NACL_IRT_TEXT_START.  Since
you moved those references to further away you should move/remove the comment. 
I'd just remove the comment since one can grep for the definitions.

[Nikolay, 2012/04/02 12:09:55]

Done.

             'link_flags': [
               '-lirt_browser',
               '-lppruntime',
               '-lsrpc',
               '-limc_syscalls',
               '-lplatform',
               '-lgio',
               '-lm',
-              '-Wl,--section-start,.rodata=<(NACL_IRT_DATA_START)',
-              '-Wl,-Ttext-segment=<(NACL_IRT_TEXT_START)',
+            ],
+            # See http://code.google.com/p/nativeclient/issues/detail?id=2691.
+            # The PNaCl linker (gold) does not implement the "-Ttext-segment"
+            # option.  However, with the linker for x86, the "-Ttext" option
+            # does not affect the executable's base address.
+            # TODO(olonho): simplify flags handling and avoid duplication
+            # with NaCl logic.
+            'conditions': [
+              ['target_arch!="arm"',
+               {
+                 'link_flags': [
+                   '-Wl,--section-start,.rodata=<(NACL_IRT_DATA_START)',
+                   '-Wl,-Ttext-segment=<(NACL_IRT_TEXT_START)',
+                 ]
+               }, { # target_arch == "arm"
+                 'link_flags': [
+                   '-Wl,--section-start,.rodata=<(NACL_IRT_DATA_START)',
+                   '-Wl,-Ttext=<(NACL_IRT_TEXT_START)',
+                   '--pnacl-allow-native',
+                   '-arch', 'arm',
+                   '-Wt,-mtls-use-call',
+                   # TODO(olonho): rethink

[Mark Seaborn, 2012/03/30 16:42:46]

Rethink what?  This comment is not descriptive enough.  Why is there a -L
argument here for ARM and not for x86?

[Nikolay, 2012/04/02 12:09:55]

That's exactly what I meant in this comment. If I'll omit this -L, linker
doesn't find irt_browser:
pnacl-ld: Cannot find '-lirt_browser'

Turned out to be a typo, fixed in
https://chromiumcodereview.appspot.com/9959060/
On 2012/03/30 16:42:46, Mark Seaborn wrote:

+                   '-L<(SHARED_INTERMEDIATE_DIR)/tc_newlib/libarm',
+                 ],
+               },
+             ],
             ],
             'sources': [
             ],
             'extra_args': [
               '--strip-debug',
             ],
             'extra_deps64': [
               '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib64/libppruntime.a',
               '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib64/libirt_browser.a',
               '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib64/libsrpc.a',
               '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib64/libplatform.a',
               '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib64/libimc_syscalls.a',
               '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib64/libgio.a',
             ],
             'extra_deps32': [
               '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib32/libppruntime.a',
               '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib32/libirt_browser.a',
               '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib32/libsrpc.a',
               '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib32/libplatform.a',
               '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib32/libimc_syscalls.a',
               '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib32/libgio.a',
             ],
+            'extra_deps_arm': [
+              '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/libarm/libppruntime.a',
+              '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/libarm/libirt_browser.a',
+              '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/libarm/libsrpc.a',
+              '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/libarm/libplatform.a',
+              '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/libarm/libimc_syscalls.a',
+              '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/libarm/libgio.a',
+            ],
           },
           'dependencies': [
             'src/shared/ppapi_proxy/ppapi_proxy_untrusted.gyp:ppruntime_lib',
             '../../native_client/src/untrusted/irt/irt.gyp:irt_browser_lib',
             '../../native_client/src/shared/srpc/srpc.gyp:srpc_lib',
             '../../native_client/src/shared/platform/platform.gyp:platform_lib',
             '../../native_client/src/untrusted/nacl/nacl.gyp:imc_syscalls_lib',
             '../../native_client/src/shared/gio/gio.gyp:gio_lib',
           ],
         },
       ],
     }],
   ],
 }