[PATCH] D36501: Add flag to request Clang is ABI-compatible with older versions of itself

[Paul Robinson via Phabricator via cfe-commits]

probinson added inline comments.


================
Comment at: lib/Driver/ToolChains/Clang.cpp:2934
+    ABICompatArg->render(Args, CmdArgs);
+
   // Add runtime flag for PS4 when PGO or Coverage are enabled.
----------------
```
else if (getToolChain().getTriple().isPS4())
  CmdArgs.push_back("-fclang-abi-compat=3.2");
```

Which lets us avoid piles of PS4 special cases all over everywhere.
Sony is historically very conservative about compatibility, and we'll be happier defaulting it this way.  Setting platform-specific defaults in the driver seems to be pretty common already, this is just one more.


Repository:
  rL LLVM

https://reviews.llvm.org/D36501