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mbsrtowcs contains "vectorized" loops to quickly step over bytes without the high bit set; these have undefined behavior by virtue of aliasing uint32_t over top of char data for the accesses. commit 4d0a82170a25464c39522d7190b9fe302045ddb2 fixed the corresponding usage in string functions by using the may_alias attribute conditional on __GNUC__ and disabled the vectorized code in its absence. do the same for mbsrtowcs.
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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/
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