Revert accidental delete of compat_execinfo.

TEST=it compiles
BUG=none
Review URL: http://codereview.chromium.org/5961007

TBR=brettw@chromium.org

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@69977 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 34 insertions, 0 deletions

diff --git a/base/compat_execinfo.h b/base/compat_execinfo.h
new file mode 100644
index 0000000..3d4cc43
--- /dev/null
+++ b/base/compat_execinfo.h
@@ -0,0 +1,34 @@
+// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// A file you can include instead of <execinfo.h> if your project might need
+// to run on Mac OS X 10.4.
+
+#ifndef BASE_COMPAT_EXECINFO_H_
+#define BASE_COMPAT_EXECINFO_H_
+#pragma once
+
+#include "build/build_config.h"
+
+#if defined(OS_MACOSX)
+#include <AvailabilityMacros.h>
+#endif
+
+#if defined(OS_MACOSX) && MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5
+// Manually define these here as weak imports, rather than including execinfo.h.
+// This lets us launch on 10.4 which does not have these calls.
+extern "C" {
+
+extern int backtrace(void**, int) __attribute__((weak_import));
+extern char** backtrace_symbols(void* const*, int)
+    __attribute__((weak_import));
+extern void backtrace_symbols_fd(void* const*, int, int)
+    __attribute__((weak_import));
+
+}  // extern "C"
+#else
+#include <execinfo.h>
+#endif
+
+#endif  // BASE_COMPAT_EXECINFO_H_