Adds tls_edit utility which patches irt_core.nexe's TLS usage.

src/untrusted/irt/irt.gyp

Index: src/untrusted/irt/irt.gyp
diff --git a/src/untrusted/irt/irt.gyp b/src/untrusted/irt/irt.gyp
index ef24b3f01900aab554a84835bb12d2ce54fefbc9..f5052d92f751a0e2122d137e20a0abe52ae4c179 100644
--- a/src/untrusted/irt/irt.gyp
+++ b/src/untrusted/irt/irt.gyp
@@ -52,10 +52,16 @@
   },
   'targets': [
     {
-      'target_name': 'irt_core_nexe',
+      'target_name': 'irt_core_raw_nexe',
       'type': 'none',
       'variables': {
-        'nexe_target': 'irt_core',
+        'nexe_target': 'irt_core_raw',
+        # These out_* fields override the default filenames, which
+        # include a "_newlib" suffix and places them in the target
+        # directory.
+        'out_newlib64': '<(SHARED_INTERMEDIATE_DIR)/irt_core_x86_64_raw.nexe',
+        'out_newlib32': '<(SHARED_INTERMEDIATE_DIR)/irt_core_x86_32_raw.nexe',
+        'out_newlib_arm': '<(SHARED_INTERMEDIATE_DIR)/irt_core_arm_raw.nexe',
         'build_glibc': 0,
         'build_newlib': 0,
         'build_irt': 1,
@@ -86,6 +92,63 @@
       ],
     },
     {
+      'target_name': 'irt_core_nexe',
+      'type': 'none',
+      'dependencies': [
+        'irt_core_raw_nexe',
+        '<(DEPTH)/native_client/src/tools/tls_edit/tls_edit.gyp:tls_edit#host',
+      ],
+      'conditions': [
+        ['target_arch=="arm"', {
+          'actions': [
+            {
+              'action_name': 'tls_edit_irt_arm',
+              'message': 'Patching TLS for irt_core (arm)',
+              'msvs_cygwin_shell': 0,
+              'inputs': [
+                '<(PRODUCT_DIR)/tls_edit',
+                '<(SHARED_INTERMEDIATE_DIR)/irt_core_arm_raw.nexe',
+              ],
+              'outputs': [
+                '<(PRODUCT_DIR)/irt_core_newlib_arm.nexe',
+              ],
+              'action': ['<@(_inputs)', '<@(_outputs)'],
+            },
+          ],
+        }],
+        ['target_arch!="arm"', {
+          'actions': [
+            {
+              'action_name': 'tls_edit_irt_x64',

[Mark Seaborn, 2014/02/04 18:09:10]

"x86-64" rather than "x64".  We don't use the term "x64" in NaCl.  Same for the
filename below.

+              'message': 'Patching TLS for irt_core (x86-64)',
+              'msvs_cygwin_shell': 0,
+              'inputs': [
+                '<(PRODUCT_DIR)/tls_edit',
+                '<(SHARED_INTERMEDIATE_DIR)/irt_core_x86_64_raw.nexe',
+              ],
+              'outputs': [
+                '<(PRODUCT_DIR)/irt_core_newlib_x64.nexe',

[Mark Seaborn, 2014/02/04 18:09:10]

"irt_core" shouldn't have "newlib" in the name because we always build it with
newlib.  (Same for the other two cases.)

If this is outputting to the wrong filename, I don't see how this would work,
since there is a test that uses the Gyp-built IRT.

+              ],
+              'action': ['<@(_inputs)', '<@(_outputs)'],
+            },
+            {
+              'action_name': 'tls_edit_irt_x32',

[Mark Seaborn, 2014/02/04 18:09:10]

"x86-32" (not the same as "x32"!)

+              'message': 'Patching TLS for irt_core (x86-32)',
+              'msvs_cygwin_shell': 0,
+              'inputs': [
+                '<(PRODUCT_DIR)/tls_edit',
+                '<(SHARED_INTERMEDIATE_DIR)/irt_core_x86_32_raw.nexe',
+              ],
+              'outputs': [
+                '<(PRODUCT_DIR)/irt_core_newlib_x32.nexe',
+              ],
+              'action': ['<@(_inputs)', '<@(_outputs)'],
+            },
+          ],
+        }],
+      ],
+    },
+    {
       'target_name': 'irt_browser_lib',
       'type': 'none',
       'variables': {