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7a4c25d780
In BRE, ^ is an anchor at the beginning of an expression, optionally it may be an anchor at the beginning of a subexpression and must be treated as a literal otherwise. Previously musl treated ^ in subexpressions as literal, but at least glibc and gnu sed treats it as an anchor and that's the more useful behaviour: it can always be escaped to get back the literal meaning. Same for $ at the end of a subexpression. Portable BRE should not rely on this, but there are sed commands in build scripts which do. This changes the meaning of the BREs: \(^a\) \(a\|^b\) \(a$\) \(a$\|b\)
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/