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a4ed0471d7
It was raised on libc-help [1] that some Linux kernel interfaces expect the libc to define __USE_TIME_BITS64 to indicate the time_t size for the kABI. Different than defined by the initial y2038 design document [2], the __USE_TIME_BITS64 is only defined for ABIs that support more than one time_t size (by defining the _TIME_BITS for each module). The 64 bit time_t redirects are now enabled using a different internal define (__USE_TIME64_REDIRECTS). There is no expected change in semantic or code generation. Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, and arm-linux-gnueabi [1] https://sourceware.org/pipermail/libc-help/2024-January/006557.html [2] https://sourceware.org/glibc/wiki/Y2038ProofnessDesign Reviewed-by: DJ Delorie <dj@redhat.com>
43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/* Features part to handle 64-bit time_t support.
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Copyright (C) 2021-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* We need to know the word size in order to check the time size. */
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#include <bits/wordsize.h>
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#include <bits/timesize.h>
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#if defined _TIME_BITS
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# if _TIME_BITS == 64
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# if ! defined (_FILE_OFFSET_BITS) || _FILE_OFFSET_BITS != 64
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# error "_TIME_BITS=64 is allowed only with _FILE_OFFSET_BITS=64"
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# endif
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# define __USE_TIME_BITS64 1
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# elif _TIME_BITS == 32
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# if __TIMESIZE > 32
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# error "_TIME_BITS=32 is not compatible with __TIMESIZE > 32"
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# endif
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# else
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# error Invalid _TIME_BITS value (can only be 32 or 64-bit)
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# endif
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#elif __TIMESIZE == 64
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# define __USE_TIME_BITS64 1
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#endif
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#if defined __USE_TIME_BITS64 && __TIMESIZE == 32
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# define __USE_TIME64_REDIRECTS 1
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#endif
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