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Differential D158128

[libc] [NFC] explain compiler macros in limits.h
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Authored by alfredfo on Aug 16 2023, 4:15 PM.

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rG13bbca8d694b: [libc] [NFC] explain compiler macros in limits.h

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alfredfo created this revision.Aug 16 2023, 4:15 PM
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alfredfo requested review of this revision.Aug 16 2023, 4:15 PM
This revision was not accepted when it landed; it landed in state Needs Review.Aug 16 2023, 4:23 PM
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Closed by commit rG13bbca8d694b: [libc] [NFC] explain compiler macros in limits.h (authored by alfredfo). · Explain Why
This revision was automatically updated to reflect the committed changes.
alfredfo added a commit: rG13bbca8d694b: [libc] [NFC] explain compiler macros in limits.h.
Harbormaster completed remote builds in B253071: Diff 550928.Aug 16 2023, 4:30 PM
alfredfo added a reverting change: rGd3e045934a3d: Revert "[libc] Add limits.h".Aug 16 2023, 9:24 PM

Revision Contents

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libc/
include/
llvm-libc-macros/
6 lines

Diff 550928

libc/include/llvm-libc-macros/limits-macros.h

#ifndef __LLVM_LIBC_MACROS_LIMITS_MACROS_H #ifndef __LLVM_LIBC_MACROS_LIMITS_MACROS_H
#define __LLVM_LIBC_MACROS_LIMITS_MACROS_H #define __LLVM_LIBC_MACROS_LIMITS_MACROS_H
// Normally compiler headers will be prefered over LLVM-libc headers and
// include_next this header, however, during LLVM-libc build itself the
// LLVM-libc headers are prefered, and to get C numerical limits we need to
// include compiler (freestanding) limits.h. The macro checks are here to avoid
// including limits.h when compiler headers have already been included.
#if !defined _GCC_LIMITS_H_ && !defined __CLANG_LIMITS_H && \ #if !defined _GCC_LIMITS_H_ && !defined __CLANG_LIMITS_H && \
__has_include_next(<limits.h>) __has_include_next(<limits.h>)
#include_next <limits.h> #include_next <limits.h>
#endif #endif
#ifdef __linux__ #ifdef __linux__
#include <linux/limits.h> #include <linux/limits.h>
#endif #endif
#ifndef SSIZE_MAX #ifndef SSIZE_MAX
#define SSIZE_MAX __LONG_MAX__ #define SSIZE_MAX __LONG_MAX__
#endif #endif
#endif // __LLVM_LIBC_MACROS_LIMITS_MACROS_H #endif // __LLVM_LIBC_MACROS_LIMITS_MACROS_H