[tsan] Mark dl_iterate_phdr.cc test as unsupported on OS X

[kubamracek]

Summary

The dl_iterate_phdr is not present on OS X.

[dvyukov]

LGTM if you fix Joerg comment.

[glider]

Don't we have a subdir for Linux-specific tests?

sent from phone

[kubamracek]

AFAIK, this test passes on Linux *and* FreeBSD.

[glider]

Completely forgot about ELF support in FreeBSD. But I wonder whether
running an ELF test binary on FreeBSD still counts as testing on
FreeBSD.

compiler-rt/trunk/test/tsan/dl_iterate_phdr.cc

 // RUN: %clangxx_tsan -O1 %s -DBUILD_SO -fPIC -shared -o %t-so.so
 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
 
 // If we mention TSAN_OPTIONS, the test won't run from test_output.sh script.
 
+// dl_iterate_phdr doesn't exist on OS X.
+// UNSUPPORTED: darwin
+
 #ifdef BUILD_SO
 
 #include "test.h"
 
 int exported_var = 0;
 
 #else  // BUILD_SO