Added compile-time define to add "initial-exec" attribute.

third_party/tcmalloc/chromium/src/thread_cache.cc

Index: third_party/tcmalloc/chromium/src/thread_cache.cc
diff --git a/third_party/tcmalloc/chromium/src/thread_cache.cc b/third_party/tcmalloc/chromium/src/thread_cache.cc
index 765786ff40302004b1b128bc38ebcafdf8309d58..20e89c25a0e5866e97f2843f14eacdb719cc7598 100644
--- a/third_party/tcmalloc/chromium/src/thread_cache.cc
+++ b/third_party/tcmalloc/chromium/src/thread_cache.cc
@@ -64,7 +64,10 @@ int ThreadCache::thread_heap_count_ = 0;
 ThreadCache* ThreadCache::next_memory_steal_ = NULL;
 #ifdef HAVE_TLS
 __thread ThreadCache* ThreadCache::threadlocal_heap_
-# ifdef HAVE___ATTRIBUTE__
+// This code links against pyautolib.so which causes it to fail when dlopen()'d.
+// This is a workaround for that. By passing in -DPGO_GENERATE, we can disable
+// the "initial-exec" variable attribute.
+#if defined(HAVE___ATTRIBUTE__) && ! defined(PGO_GENERATE)

[Alexander Potapenko, 2012/04/24 10:38:15]

Ditto.

[asharif1, 2012/04/24 17:50:12]

Done.

    __attribute__ ((tls_model ("initial-exec")))
 # endif
    ;