3c64a98180
Summary: The `errno` variable is expected to be `thread_local` by the standard. However, the GPU targets do not support `thread_local` and implementing that would be a large endeavor. Because of that, we previously didn't provide the `errno` symbol at all. However, to build some programs we at least need to be able to link against `errno`. Many things that would normally set `errno` completely ignore it currently (i.e. stdio) but some programs still need to be able to link against correct C programs. For this purpose this patch exports the `errno` symbol as a simple global. Internally, this will be updated atomically so it's at least not racy. Externally, this will be on the user. I've updated the documentation to state as such. This is required to get `libc++` to build.
43 lines
1021 B
Modula-2
43 lines
1021 B
Modula-2
//===-- C standard library header errno.h ---------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_ERRNO_H
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#define LLVM_LIBC_ERRNO_H
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#include "__llvm-libc-common.h"
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#ifdef __linux__
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#include <linux/errno.h>
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#ifndef ENOTSUP
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#define ENOTSUP EOPNOTSUPP
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#endif // ENOTSUP
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#include "llvm-libc-macros/linux/error-number-macros.h"
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#else // __linux__
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#include "llvm-libc-macros/generic-error-number-macros.h"
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#endif
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#if defined(__AMDGPU__) || defined(__NVPTX__)
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extern int __llvmlibc_errno; // Not thread_local!
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#else
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#ifdef __cplusplus
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extern "C" {
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extern thread_local int __llvmlibc_errno;
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}
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#else
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extern _Thread_local int __llvmlibc_errno;
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#endif // __cplusplus
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#endif
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#define errno __llvmlibc_errno
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#endif // LLVM_LIBC_ERRNO_H
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