Louis Dionne 0e9a01dcac [libc++] Fix modules builds when features are removed
When some headers are not available because we removed features like
localization or threads, the compiler should not try to include these
headers when building modules. To avoid that from happening, add a
requires-declaration that is never satisfied when the configuration
in use doesn't support a header.

rdar://93777687

Differential Revision: https://reviews.llvm.org/D127127
2022-06-08 18:48:25 -04:00

62 lines
1.1 KiB
C++

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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_CSIGNAL
#define _LIBCPP_CSIGNAL
/*
csignal synopsis
Macros:
SIG_DFL
SIG_ERR
SIG_IGN
SIGABRT
SIGFPE
SIGILL
SIGINT
SIGSEGV
SIGTERM
namespace std
{
Types:
sig_atomic_t
void (*signal(int sig, void (*func)(int)))(int);
int raise(int sig);
} // std
*/
#include <__assert> // all public C++ headers provide the assertion handler
#include <__config>
#if __has_include(<signal.h>)
# include <signal.h>
#endif
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
using ::sig_atomic_t _LIBCPP_USING_IF_EXISTS;
using ::signal _LIBCPP_USING_IF_EXISTS;
using ::raise _LIBCPP_USING_IF_EXISTS;
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_CSIGNAL