Create builds configured for ARM and AARCH64.

tools/relocation_packer/relocation_packer.gyp

Index: tools/relocation_packer/relocation_packer.gyp
diff --git a/tools/relocation_packer/relocation_packer.gyp b/tools/relocation_packer/relocation_packer.gyp
index 4642a27c2238500a5aa98ea3ccd7a56ada2783cf..0db5d5822e188b2b1927cbf5a49e1e50fe19d97a 100644
--- a/tools/relocation_packer/relocation_packer.gyp
+++ b/tools/relocation_packer/relocation_packer.gyp
@@ -8,6 +8,9 @@
       'target_name': 'lib_relocation_packer',
       'toolsets': ['host'],
       'type': 'static_library',
+      'cflags': [
+        '-DTARGET_ARM',

[rmcilroy, 2014/07/18 14:05:17]

Could you pull this out into a variable and use the variable throughout (which
presumably needs to be conditionally set when you add ARM64 targets).

[simonb (inactive), 2014/07/21 12:15:49]

Done.

+      ],
       'dependencies': [
         '../../third_party/elfutils/elfutils.gyp:libelf',
       ],
@@ -23,6 +26,9 @@
       'target_name': 'relocation_packer',
       'toolsets': ['host'],
       'type': 'executable',
+      'cflags': [
+        '-DTARGET_ARM',
+      ],
       'dependencies': [
         '../../third_party/elfutils/elfutils.gyp:libelf',
         'lib_relocation_packer',
@@ -36,6 +42,7 @@
       'toolsets': ['host'],
       'type': 'executable',
       'cflags': [
+        '-DTARGET_ARM',
         '-DINTERMEDIATE_DIR="<(INTERMEDIATE_DIR)"',
       ],
       'dependencies': [