Import the asan runtime library into GCC treedodji/asan-merge-assemble

This patch imports the runtime library in the GCC tree, ensures that
-lasan is passed to the linker when -faddress-sanitizer is used and
sets up the build system accordingly.

     * configure.ac: Add libsanitizer to target_libraries.
	* Makefile.def: Ditto.
	* configure: Regenerate.
	* Makefile.in: Regenerate.
	* libsanitizer: New directory for asan runtime.  Contains an empty
	tsan directory.

gcc:
	* gcc.c (LINK_COMMAND_SPEC): Add -lasan to link command
	if -faddress-sanitizer is on.

libsanitizer:

	Initial checkin: migrate asan runtime from llvm.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/asan@192977 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 29 insertions, 0 deletions

diff --git a/libsanitizer/interception/interception_mac.cc b/libsanitizer/interception/interception_mac.cc
new file mode 100644
index 00000000000..c9b7dd32d0f
--- /dev/null
+++ b/libsanitizer/interception/interception_mac.cc
@@ -0,0 +1,29 @@
+//===-- interception_mac.cc -------------------------------------*- C++ -*-===//
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// Mac-specific interception methods.
+//===----------------------------------------------------------------------===//
+
+#ifdef __APPLE__
+
+#include "interception.h"
+#include "mach_override/mach_override.h"
+
+namespace __interception {
+bool OverrideFunction(uptr old_func, uptr new_func, uptr *orig_old_func) {
+  *orig_old_func = 0;
+  int res = __asan_mach_override_ptr_custom((void*)old_func, (void*)new_func,
+                                            (void**)orig_old_func,
+                                            __interception_allocate_island,
+                                            __interception_deallocate_island);
+  return (res == 0) && (*orig_old_func != 0);
+}
+}  // namespace __interception
+
+#endif  // __APPLE__