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f12bd8e05c
linux/input.h and perhaps others use this macro to determine whether the userspace time_t is 64-bit when potentially defining types in terms of time_t and derived structures. the name __USE_TIME_BITS64 is unfortunate; it really should have been in the __UAPI namespace. but this is what was chosen back in v4.16 when first preparing input.h for time64 userspace, presumably based on expectations about what the glibc-internal features.h macro for time64 would be, and changing it now would just put a new minimum version requirement on kernel headers. the __USE_TIME_BITS64 macro is not intended as a public interface. it is purely an internal contract between libc and Linux uapi headers.
musl libc
musl, pronounced like the word "mussel", is an MIT-licensed
implementation of the standard C library targetting the Linux syscall
API, suitable for use in a wide range of deployment environments. musl
offers efficient static and dynamic linking support, lightweight code
and low runtime overhead, strong fail-safe guarantees under correct
usage, and correctness in the sense of standards conformance and
safety. musl is built on the principle that these goals are best
achieved through simple code that is easy to understand and maintain.
The 1.1 release series for musl features coverage for all interfaces
defined in ISO C99 and POSIX 2008 base, along with a number of
non-standardized interfaces for compatibility with Linux, BSD, and
glibc functionality.
For basic installation instructions, see the included INSTALL file.
Information on full musl-targeted compiler toolchains, system
bootstrapping, and Linux distributions built on musl can be found on
the project website:
http://www.musl-libc.org/