[PATCH] Working on reconciling out-of-tree patches to compiler-rt for building for iOS.

[Chris Bieneman]

================
Comment at: lib/asan/asan_mac.cc:28
@@ +27,3 @@
+#if !SANITIZER_IOS
+#include <crt_externs.h>  // for _NSGetArgv and _NSGetEnviron
+#else
----------------
samsonov wrote:
> beanz wrote:
> > samsonov wrote:
> > > How did this #include for SANITIZER_IOSSIM before this change?
> > crt_externs.h exists in the iOS Simulator SDK, but not in the device SDK... Don't ask. I have no answers.
> That's fine, but doesn't this mean we should keep #including <crt_externs.h> on iossim?
> I'd actually vote for making SANITIZER_IOS and SANITIZER_IOSSIM exclusive. In this case we won't have to care about correct order of #elif clauses in asan_mapping.h
Six one way half a dozen the other.

It will work either way. My general preference is to have the Simulator code follow the iOS code paths everywhere except where it is absolutely necessary to deviate, but I could go either way on this.

I don't think you should make SANITIZER_IOS and SANITIZER_IOSSIM exclusive. The general Darwin model is that the iOS simulator is iOS.

I could easily change the check here to `#if (!SANITIZER_IOS) || SANITIZER_IOSSIM`.

http://reviews.llvm.org/D10515

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