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musl - an implementation of the standard library for Linux-based systems

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Rich Felker cdbbcfb8f5 fix dubious char signedness check in limits.h commit `201995f382` introduced a hack utilizing the signedness of character constants at the preprocessor level to avoid depending on the gcc-specific __CHAR_UNSIGNED__ predef. while this trick works on gcc and presumably other compilers being used, it's not clear that the behavior it depends on is actually conforming. C11 6.4.4.4 ¶10 defines character constants as having type int, and 6.10.1 ¶4 defines preprocessor #if arithmetic to take place in intmax_t or uintmax_t, depending on the signedness of the integer operand types, and it is specified that "this includes interpreting character constants". if character literals had type char and just promoted to int, it would be clear that when char is unsigned they should behave as uintmax_t at the preprocessor level. however, as written the text of the standard seems to require that character constants always behave as intmax_t, corresponding to int, at the preprocessor level. since there is a good deal of ambiguity about the correct behavior and a risk that compilers will disagree or that an interpretation may mandate a change in the behavior, do not rely on it for defining CHAR_MIN and CHAR_MAX correctly. instead, use the signedness of the value (as opposed to the type) of '\xff', which will be positive if and only if plain char is unsigned. this behavior is clearly specified, and the specific case '\xff' is even used in an example, under 6.4.4.4 of the standard.		2018-08-28 13:54:50 -04:00
arch	move inclusion of linux headers for kd.h, soundcard.h, vt.h to bits	2018-07-20 01:06:41 -04:00
crt	add s390x port	2016-11-11 23:06:21 -05:00
dist	add another example option to dist/config.mak	2012-04-24 16:49:11 -04:00
include	fix dubious char signedness check in limits.h	2018-08-28 13:54:50 -04:00
ldso	block dlopen of libraries with initial-exec refs to dynamic TLS	2018-07-16 12:32:57 -04:00
src	fix deadlock in async thread self-cancellation	2018-08-28 12:45:44 -04:00
tools	fix musl-gcc wrapper to be compatible with default-pie gcc toolchains	2018-08-02 19:15:48 -04:00
.gitignore	remove obsolete gitignore rules	2016-07-06 00:21:25 -04:00
configure	add m68k port	2018-06-19 13:24:05 -04:00
COPYRIGHT	update authors/contributors list	2018-02-21 14:19:01 -05:00
dynamic.list	allow interposition/replacement of allocator (malloc)	2018-04-18 14:22:49 -04:00
INSTALL	add powerpc64 and s390x to list of supported archs in INSTALL file	2017-08-29 20:48:02 -04:00
Makefile	adjust makefile target-specific CFLAGS rules to be more robust & complete	2018-03-24 22:47:36 -04:00
README	update version reference in the README file	2014-06-25 14:16:53 -04:00
VERSION	release 1.1.19	2018-02-22 13:39:19 -05:00
WHATSNEW	release 1.1.19	2018-02-22 13:39:19 -05:00

README

    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/