GYP build for ARM untrusted runtime.

src/untrusted/irt/irt.gyp

 # Copyright (c) 2012 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': [
     '../../../build/common.gypi',
   ],
   'variables': {
     'irt_sources': [
@@ skipping 28 matching lines @@
     ],
     'irt_browser': [
       'irt_interfaces_ppapi.c',
       'irt_entry_ppapi.c',
       'irt_ppapi.c',
       'irt_manifest.c',
       'irt_nameservice.c',
       'irt_random.c',
     ],
   },
-  'conditions': [
-    # NOTE: We do not support untrusted gyp build on arm yet.
-    ['target_arch!="arm"', {
-      'targets': [
-        {
-          'target_name': 'irt_core_nexe',
-          'type': 'none',
+  'targets': [
+    {
+      'target_name': 'irt_core_nexe',
+      'type': 'none',
+      'variables': {
+        'nexe_target': 'irt_core',
+        'build_glibc': 0,
+        'build_newlib': 1,
+        'sources': ['<@(irt_sources)', '<@(irt_nonbrowser)'],
+        'conditions': [
+          # See comment in native_client/src/untrusted/irt/nacl.scons
+          # regarding -Ttext-segment.
+          ['target_arch!="arm"',
+           {
+             'link_flags': [
+               '-Wl,--section-start,.rodata=<(NACL_IRT_DATA_START)',
+               '-Wl,-Ttext-segment=<(NACL_IRT_TEXT_START)',
+             ]
+           }, { # target_arch == "arm"
+             'sources': ['<@(irt_sources)',
+                         'aeabi_read_tp.S'],
+             'cflags': ['--pnacl-allow-translate',
+                        '-arch', 'arm'],
+             'asflags': ['-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
+               '-L<(SHARED_INTERMEDIATE_DIR)/tc_newlib/libarm',
+             ],
+           },
+         ],
+        ],
+      },
+      'dependencies': [
+        '<(DEPTH)/native_client/tools.gyp:prep_toolchain',
+        '<(DEPTH)/native_client/src/untrusted/nacl/nacl.gyp:nacl_lib_newlib',
+      ],
+    },
+    {
+      'target_name': 'irt_browser_lib',

[robertm, 2012/03/26 14:09:33]

just curious: if you run gyp for x86, does it built an
irt_browser_lib  (use 'find' to see whether a nexe with a related name appears
somewhere).
If yes can you confirm that it also builds something for arm.

if yes, can you check whether the -r and nostartfiles
options also work for arm. The -nostartfiles option seems pretty essential to
me, otherwise we might just produce a bad irt.

[Nikolay, 2012/03/26 16:28:51]

From what I seen, it's only used from ppapi/native_client/native_client.gyp
where it's one of dependencies used to build final 
runtime .nexe.
So it's not build during standalone build, only during browser runtime build in
Chrome. 
Seems you're right about nostartfiles (and maybe it work even without it due to
llvm/gcc differences, so I unified that.

On 2012/03/26 14:09:33, robertm wrote:

+      'type': 'none',
+      'variables': {
+        'nlib_target': 'libirt_browser.a',
+        'build_glibc': 0,
+        'build_newlib': 1,
+        'sources': ['<@(irt_sources)', '<@(irt_browser)'],
+      },
+      'conditions': [
+        ['target_arch == "x64" or target_arch == "ia32"', {
           'variables': {
-            'nexe_target': 'irt_core',
-            'build_glibc': 0,
-            'build_newlib': 1,
-            'sources': ['<@(irt_sources)', '<@(irt_nonbrowser)'],
             'link_flags': [
-              '-Wl,--section-start,.rodata=<(NACL_IRT_DATA_START)',
-              '-Wl,-Ttext-segment=<(NACL_IRT_TEXT_START)',
+              '-r',
+              '-nostartfiles',
             ],
           },
-          'dependencies': [
-            '<(DEPTH)/native_client/tools.gyp:prep_toolchain',
-            '<(DEPTH)/native_client/src/untrusted/nacl/nacl.gyp:nacl_lib_newlib',
-          ],
-        },
-        {
-          'target_name': 'irt_browser_lib',
-          'type': 'none',
-          'variables': {
-            'nlib_target': 'libirt_browser.a',
-            'build_glibc': 0,
-            'build_newlib': 1,
-            'sources': ['<@(irt_sources)', '<@(irt_browser)'],
-          },
-          'conditions': [
-            ['target_arch == "x64" or target_arch == "ia32"', {
-              'variables': {
-                'link_flags': [
-                  '-r',
-                  '-nostartfiles',
-                ],
-              },
-            }],
-          ],
-          'dependencies': [
-            '<(DEPTH)/native_client/tools.gyp:prep_toolchain',
-            '<(DEPTH)/native_client/src/untrusted/nacl/nacl.gyp:nacl_lib_newlib',
-          ],
-        },
+        }],
       ],
-    }],
+      'dependencies': [
+        '<(DEPTH)/native_client/tools.gyp:prep_toolchain',
+        '<(DEPTH)/native_client/src/untrusted/nacl/nacl.gyp:nacl_lib_newlib',
+      ],
+    },
   ],
 }