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aee99ab4fe
Whilst the commit message documented some of the details, I had intended
to include this comment in the actual header, but failed to amend the
commit properly.
Fixes: 9e5b0d9eac ("cross-build: Fix bmake bootstrap with glibc 2.34")
MFC after: 1 week
47 lines
2.4 KiB
C
47 lines
2.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright 2021 Jessica Clarke <jrtc27@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#pragma once
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/*
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* glibc's sys/wait.h and stdlib.h both define various wait-related constants,
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* depending on __USE_XOPEN(2K8) and if the other header has been included.
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* Since they each probe the other's include guard to determine that, there is
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* a window between a header defining its include guard and checking for the
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* other's within which, if the other is included for the first time, they both
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* believe the other has already defined the relevant macros etc, and so
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* neither ends up doing so. This was not previously hit, and is still not hit
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* when using glibc normally (though seems extremely fragile). However, as of
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* glibc 2.34, signal.h, included by sys/wait, includes a new bits/sigstksz,
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* which in turn includes unistd.h (when _SC_SIGSTKSZ_SOURCE is defined, which
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* is implied by _GNU_SOURCE), which we wrap and include stdlib.h from,
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* creating the exact aforementioned situation that breaks. Thus, forcefully
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* include stdlib.h first whenever sys/wait.h is as a workaround, since that
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* way round still works.
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*/
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#include <stdlib.h>
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#include_next <sys/wait.h>
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