[MIPS] Support for MIPS PNaCl in PPAPI

ppapi/native_client/src/untrusted/pnacl_irt_shim/pnacl_irt_shim.gyp

Index: ppapi/native_client/src/untrusted/pnacl_irt_shim/pnacl_irt_shim.gyp
diff --git a/ppapi/native_client/src/untrusted/pnacl_irt_shim/pnacl_irt_shim.gyp b/ppapi/native_client/src/untrusted/pnacl_irt_shim/pnacl_irt_shim.gyp
index 787d6206b29ef5edd06662952cdf0bd2ad8c2f7f..afc0476c8da4b1d2b62a0661570be0528cd37c5b 100644
--- a/ppapi/native_client/src/untrusted/pnacl_irt_shim/pnacl_irt_shim.gyp
+++ b/ppapi/native_client/src/untrusted/pnacl_irt_shim/pnacl_irt_shim.gyp
@@ -15,6 +15,7 @@
         'out_newlib_arm': '>(tc_lib_dir_pnacl_translate)/lib-arm/libpnacl_irt_shim.a',
         'out_newlib32': '>(tc_lib_dir_pnacl_translate)/lib-x86-32/libpnacl_irt_shim.a',
         'out_newlib64': '>(tc_lib_dir_pnacl_translate)/lib-x86-64/libpnacl_irt_shim.a',
+        'out_newlib_mips': '>(tc_lib_dir_pnacl_translate)/lib-mips/libpnacl_irt_shim.a',

[jvoung (off chromium), 2014/02/06 00:39:56]

lib-mips32 to be consistent w/ the other part? Doesn't matter much I guess...

[petarj, 2014/02/20 00:23:18]

This line is removed now.

         'build_glibc': 0,
         'build_newlib': 1,
         'force_arm_pnacl': 1,
@@ -37,6 +38,13 @@
               '-arch', 'arm',
             ],
           }],
+          ['target_arch=="mipsel"', {
+            'compile_flags': [
+              '--pnacl-allow-translate',

[jvoung (off chromium), 2014/02/06 00:39:56]

Currently have a CL to change this a bit. CC'ed you on part one of it.

What is the native ABI for the IRT? Is it based on clang's le32-none-nacl? Are
you also using the pnacl ABI stabilization passes like ExpandByVal when you
build the IRT?

If so, this shim might be a nop and you can use a dummy shim or change the
linker rules to skip the shim.

[petarj, 2014/02/20 00:23:18]

It's le32-unknown-nacl.
Yes, '-expand-byval' is used.
 
You are right. We have just modified the code to use dummy shim.

+              '--pnacl-allow-native',
+              '-arch', 'mips',
+            ],
+          }],
         ],
       },
       'dependencies': [