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musl - an implementation of the standard library for Linux-based systems
833a469167
unlike most projects that use -fno-strict-aliasing, we aim to have all sources respect the C language rules for effective type that make type-based alias analysis optimizations possible. unfortunately, it turns out that there are deep, and likely very difficult to fix, flaws in the TBAA performed by GCC and likely other compilers, whereby this kind of optimization can transform code that follows the rules strictly in ways that will make it malfunction. see for example GCC bugs 107107 and 107115, the latter of which also affects clang. there are not presently any known instances of breakage due to wrong type-based aliasing optimizations in our codebase. nonetheless, since the transformations are unsound and could introduce breakage, configure CFLAGS to build with -fno-strict-aliasing. some casual analysis of the effects on codegen suggest that this is unlikely to affect performance except possibly in the regex engine. in general, we should probably prefer making better use of the restrict keyword over relying on types to imply non-aliasing for optimization purposes; doing so should be able to get back any performance that was lost and more, should it turn out to matter (unlikely). |
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| .gitignore | ||
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| configure | ||
| COPYRIGHT | ||
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| INSTALL | ||
| Makefile | ||
| README | ||
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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/