================
Comment at: lib/Driver/ToolChains.cpp:2379
@@ +2378,3 @@
+  if (GCCInstallation.isValid() && isMipsArch(getTriple().getArch())) {
+    Twine MipsInc = GCCInstallation.getInstallPath() + "/include";
+    if (llvm::sys::fs::exists(MipsInc))
----------------
Rafael Ávila de Espíndola wrote:
> It is dangerous to use Twine like this. I think this case is safe, but a 
> change to, for example, compute a string in getInstallPath instead of just 
> returning a StringRef to a member would break this.
> 
> Can you add a trivial addExternCSystemIncludeIfExits with a Twine argument to 
> avoid this? Or maybe addExternCSystemInclude itself could check if thee 
> directory exit?
I prefer to make addExternCSystemIncludeIfExits(). It's a good idea to move 
path existence checking to the addExternCSystemInclude(). But I think this 
change should be made by a separate commit.


http://llvm-reviews.chandlerc.com/D644
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