rnk added a comment.
Sorry for ignoring this. I looked at it, didn't like the approach, but couldn't
think of a better one.
Here's a dumb idea: what if we alias -Wa,-mcpu= to -mcpu=? This would have the
unintended side effect of making -Wa,-mcpu affect the CPU used for
*compilation* in addition to assembly, but that seems like not a very big deal.
If that's OK, it solves the whole getLastArg problem without complicating the
driver C++ code.
================
Comment at: lib/Driver/Tools.cpp:536
@@ +535,3 @@
+ if (Value.startswith("-mcpu="))
+ CPU = Value.substr(6);
+ if (Value.startswith("-march="))
----------------
You probably want to clang-format the patch.
http://reviews.llvm.org/D11148
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