[PATCH] D21023: [mips] Defer validity check for CPU/ABI pairs and improve error message for invalid cases.

[Daniel Sanders via cfe-commits]

dsanders created this revision.
dsanders added a reviewer: atanasyan.
dsanders added a subscriber: cfe-commits.
Herald added a subscriber: sdardis.

The validity of ABI/CPU pairs is no longer checked on the fly but is
instead checked after initialization. As a result, invalid CPU/ABI pairs
can be reported as being known but invalid instead of being unknown. For
example, we now emit:
  error: ABI 'n32' is not supported on CPU 'mips32r2'
instead of:
  error: unknown target ABI 'n64'

http://reviews.llvm.org/D21023

Files:
  include/clang/Basic/DiagnosticCommonKinds.td
  include/clang/Basic/TargetInfo.h
  lib/Basic/Targets.cpp
  test/Driver/mips-abi.c

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