Eric Fiselier b168a7c660 Fix PR39749 - Headers containing just #error harm __has_include.
This patch changes <experimental/foo> to use #warning instead of
is harmful to common feature detection idioms.

We should also consider only emitting the warning when __DEPRECATED is
defined, like we do in the <ext/foo> headers. Users may want to specify
"-Werror=-W#warnings" while still ignoring the libc++ warnings.

llvm-svn: 350485
2019-01-06 00:37:31 +00:00

22 lines
737 B
C++

// -*- C++ -*-
//===-------------------------- system_error ------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_EXPERIMENTAL_SYSTEM_ERROR
#define _LIBCPP_EXPERIMENTAL_SYSTEM_ERROR
#include <__config>
#ifdef _LIBCPP_WARNING
_LIBCPP_WARNING("<experimental/system_error> has been removed. Use <system_error> instead.")
#else
# warning "<experimental/system_error> has been removed. Use <system_error> instead."
#endif
#endif // _LIBCPP_EXPERIMENTAL_SYSTEM_ERROR