llvm-capstone/libcxx/include/clocale
Louis Dionne 8cedff10a1 [libc++] Diagnose when header search paths are set up incorrectly
An issue I often see in codebases compiled for unusual platforms is
that header search paths are specified manually and are subtly wrong.
For example, people will manually add `-isystem <some-toolchain>/usr/include`,
which ends up messing up the layering of header search paths required by
libc++ (because the C Standard Library now appears *before* libc++ in
the search paths). Without this patch, this will end up causing
compilation errors that are pretty inscrutable. This patch aims to
improve the user experience by diagnosing this issue explicitly.

In all cases I can think of, I would expect that a compilation error
occur if these header search paths are not layered properly. This
should only provide an explicit diagnostic instead of failing due
to seemingly unrelated compilation errors.

Differential Revision: https://reviews.llvm.org/D131441
2022-08-17 14:05:26 -04:00

63 lines
1.5 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_CLOCALE
#define _LIBCPP_CLOCALE
/*
clocale synopsis
Macros:
LC_ALL
LC_COLLATE
LC_CTYPE
LC_MONETARY
LC_NUMERIC
LC_TIME
NULL
namespace std
{
struct lconv;
char* setlocale(int category, const char* locale);
lconv* localeconv();
} // std
*/
#include <__assert> // all public C++ headers provide the assertion handler
#include <__config>
#include <locale.h>
#ifndef _LIBCPP_LOCALE_H
# error <clocale> tried including <locale.h> but didn't find libc++'s <locale.h> header. \
This usually means that your header search paths are not configured properly. \
The header search paths should contain the C++ Standard Library headers before \
any C Standard Library, and you are probably using compiler flags that make that \
not be the case.
#endif
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
using ::lconv _LIBCPP_USING_IF_EXISTS;
using ::setlocale _LIBCPP_USING_IF_EXISTS;
using ::localeconv _LIBCPP_USING_IF_EXISTS;
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_CLOCALE