78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
#ifndef VLIBC_FEATURES_H
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#define VLIBC_FEATURES_H
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/*
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* vlibc — compatibility feature gate.
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*
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* This header is generated by configure from include/vlibc/features.h.in; do
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* not edit the generated file. It exposes the active compatibility profile as
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* build-time constants, so headers and sources can gate declarations on the
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* profile level (see configure.ac and docs/compatibility.md):
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*
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* 1 onlyposix pure POSIX, nothing more
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* 2 muslmimic musl-like, light
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* 3 muslext musl-extended
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* 4 spoof glibc replica (drop-in compatibility)
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* 5 vlibc glibc-extended, the default
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*
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* VLIBC_LEVEL is the numeric level (1..5); VLIBC_PROFILE is the profile name.
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* Both are emitted only when not already defined: the library's own sources
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* include config.h first (via HAVE_CONFIG_H), whose values win, and this
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* header skips the redefinition. Consumers of the installed header get the
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* values baked in at configure time.
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*/
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/* clang-format off */
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#ifndef VLIBC_LEVEL
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#define VLIBC_LEVEL @vlibc_level@
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#endif
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#ifndef VLIBC_PROFILE
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#define VLIBC_PROFILE "@vlibc_profile@"
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#endif
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/* clang-format on */
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/* True when the active profile is at least level n. */
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#define VLIBC_LEVEL_GE(n) (VLIBC_LEVEL >= (n))
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/*
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* Per-profile feature booleans, derived from VLIBC_LEVEL. Levels are
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* cumulative: level 3 implies the POSIX and musl feature sets as well. A
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* macro is defined (as 1) when its feature set is present and left undefined
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* otherwise, so `#if VLIBC_HAS_MUSL` works in both cases.
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*/
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#if VLIBC_LEVEL >= 1
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#define VLIBC_HAS_POSIX 1
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#endif
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#if VLIBC_LEVEL >= 2
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#define VLIBC_HAS_MUSL 1
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#endif
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#if VLIBC_LEVEL >= 3
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#define VLIBC_HAS_MUSLEXT 1
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#endif
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#if VLIBC_LEVEL >= 4
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#define VLIBC_HAS_GLIBC 1
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#endif
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#if VLIBC_LEVEL >= 5
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#define VLIBC_HAS_VLIBC 1
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#endif
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/*
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* Per-header availability gates, derived from VLIBC_LEVEL. The ISO C core
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* headers (<stddef.h>, <stdint.h>, <stdbool.h>, <stdalign.h>, <iso646.h>,
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* <limits.h>, <float.h>, <assert.h>, <stdarg.h>, <stdnoreturn.h>,
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* <stdatomic.h>, <stdbit.h>, <stdckdint.h>, <tgmath.h>) are present in every
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* profile and carry no gate. The POSIX-facing headers below exist only in
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* profiles that provide POSIX (level >= 1, i.e. all profiles today); each
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* header includes this file and gates its declarations on its own macro.
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*/
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#if VLIBC_LEVEL >= 1
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#define VLIBC_HAS_HEADER_SYS_TYPES_H 1
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#define VLIBC_HAS_HEADER_UCHAR_H 1
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#define VLIBC_HAS_HEADER_CPIO_H 1
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#define VLIBC_HAS_HEADER_TAR_H 1
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#define VLIBC_HAS_HEADER_THREADS_H 1
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#endif
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#endif /* VLIBC_FEATURES_H */
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