================
Comment at: lib/Driver/SanitizerArgs.cpp:178
@@ +177,3 @@
+
+ Arg *DebugRTArg = nullptr;
+ if (Args.hasArg(options::OPT__SLASH_MTd))
----------------
ehsan wrote:
> samsonov wrote:
> > Can you use the following syntax here?
> > if (Arg *WindowsDebugRTArg = Args.getLastArg(options::OPT__SLASH_MTd,
> > options::OPT__SLASH_MDd,
> > options::OPT__SLASH_LDd)) {
> > D.Diag(...) << ....;
> > }
> >
> > Also, what is MSVC/clang-cl semantics if I pass "/MTd /MT"? Will it pick up
> > the last flag (/MT), or try to link both runtimes?
> > In the first case we don't need to produce the error.
> When passing "/MTd /MT", /MTd will be ignored. clang-cl honors that too. I
> should actually add a test case for that too.
MSVC generally implements "last flag wins" for conflicting flags, with some
exceptions for things like /EH. They warn on it, but we don't because it's been
the behavior in gcc for a long time.
http://reviews.llvm.org/D5764
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