Revert r256322 (and follow-up 256323), the test it added does not pass on OS X.

llvm-svn: 257896

Author: nico

libcxxabi/src/private_typeinfo.cpp

@@ -34,12 +34,9 @@
 // 
 // _LIBCXX_DYNAMIC_FALLBACK is currently off by default.
 
-
-#include <string.h>
-
-
 #ifdef _LIBCXX_DYNAMIC_FALLBACK
 #include "abort_message.h"
+#include <string.h>
 #include <sys/syslog.h>
 #endif
 
@@ -60,19 +57,31 @@ namespace __cxxabiv1
 
 #pragma GCC visibility push(hidden)
 
+#ifdef _LIBCXX_DYNAMIC_FALLBACK
+
 inline
 bool
 is_equal(const std::type_info* x, const std::type_info* y, bool use_strcmp)
 {
-#ifndef _WIN32
     if (!use_strcmp)
         return x == y;
     return strcmp(x->name(), y->name()) == 0;
+}
+
+#else  // !_LIBCXX_DYNAMIC_FALLBACK
+
+inline
+bool
+is_equal(const std::type_info* x, const std::type_info* y, bool)
+{
+#ifndef _WIN32
+    return x == y;
 #else
     return (x == y) || (strcmp(x->name(), y->name()) == 0);
-#endif
+#endif    
 }
 
+#endif  // _LIBCXX_DYNAMIC_FALLBACK
 
 // __shim_type_info
 
@@ -342,17 +351,8 @@ bool
 __pbase_type_info::can_catch(const __shim_type_info* thrown_type,
                              void*&) const
 {
-    if (is_equal(thrown_type, &typeid(std::nullptr_t), false)) return true;
-    bool use_strcmp = this->__flags & (__incomplete_class_mask |
-                                       __incomplete_mask);
-    if (!use_strcmp) {
-        const __pbase_type_info* thrown_pbase = dynamic_cast<const __pbase_type_info*>(
-                thrown_type);
-        if (!thrown_pbase) return false;
-        use_strcmp = thrown_pbase->__flags & (__incomplete_class_mask |
-                                              __incomplete_mask);
-    }
-    return is_equal(this, thrown_type, use_strcmp);
+    return is_equal(this, thrown_type, false) ||
+           is_equal(thrown_type, &typeid(std::nullptr_t), false);
 }
 
 #ifdef __clang__