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LIBC_ERRNO_MODE_SYSTEM to be header-only. (#143187)
This is the first step in preparation for:
https://discourse.llvm.org/t/rfc-make-clang-builtin-math-functions-constexpr-with-llvm-libc-to-support-c-23-constexpr-math-functions/86450
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This reverts commit 0adff0af20c7d9bae8bd8bdf402506c10369ead1.
Breaks the GPU build
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Add a `clock_gettime` emulation layer and use it to implement the `time`
entrypoint.
For windows, the monotonic clock is emulated using `QPC`.
The realtime clock is emulated using `GetSystemTimePreciseAsFileTime`.
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This is a part of #97655.
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declaration" (#98593)
Reverts llvm/llvm-project#98075
bots are broken
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This is a part of #97655.
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Reverts llvm/llvm-project#91657 and Relands #91485
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Reverts llvm/llvm-project#91485. It breaks GPU and fuchisa.
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This is step 4 of
https://discourse.llvm.org/t/rfc-customizable-namespace-to-allow-testing-the-libc-when-the-system-libc-is-also-llvms-libc/73079
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Similar to D159208, this patch unifies the calls to a syscall, in this
patch it is the syscall SYS_clock_gettime/SYS_clock_gettime64.
This patch also fixes calls to SYS_clock_gettime64 by creating a
timespec64 object, passing it to the syscall and rewriting the timespec
given by the caller with timespec64 object's contents. This fixes cases
where timespec has a 4 bytes long time_t member, but SYS_clock_gettime
is not available (e.g., rv32).
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