Testing for whether 'backtrace' exists on CI, for testing

Author: elsteveogrande

libcxx/src/CMakeLists.txt

@@ -45,6 +45,7 @@ set(LIBCXX_SOURCES
   stacktrace/images.cpp
   stacktrace/impl_generic.cpp
   stacktrace/impl_windows.cpp
+  stacktrace/libbacktrace.h
   stacktrace/tools/apple_atos.cpp
   stacktrace/tools/gnu_addr2line.cpp
   stacktrace/tools/llvm_symbolizer.cpp

libcxx/src/stacktrace/libbacktrace.h

@@ -0,0 +1,44 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LIBCPP_STACKTRACE_LIBBACKTRACE_H
+#define __LIBCPP_STACKTRACE_LIBBACKTRACE_H
+
+#include <__stacktrace/basic_stacktrace.h>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+namespace __stacktrace {
+bool try_libbacktrace();
+} // namespace __stacktrace
+_LIBCPP_END_NAMESPACE_STD
+
+#if !defined(_WIN32) && __has_include(<backtrace.h>)
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+namespace __stacktrace {
+
+auto z = XXXXXXXXXXXXXXXXXXXXXXXX___BACKTRACE___XXXXXXXXXXXXXXXXXXXXXXXX;
+
+inline bool try_libbacktrace() { return false; }
+
+} // namespace __stacktrace
+_LIBCPP_END_NAMESPACE_STD
+
+#else
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+namespace __stacktrace {
+
+inline bool try_libbacktrace() { return false; }
+
+} // namespace __stacktrace
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // !defined(_WIN32) && __has_include(<libbacktrace.h>)
+
+#endif // __LIBCPP_STACKTRACE_LIBBACKTRACE_H