mirror of
https://git.musl-libc.org/git/musl
synced 2025-01-21 21:52:04 +03:00
b129cd8690
since 4.1, gcc has had the __returns_twice__ attribute and has required functions which return twice to carry it; however it's always applied it automatically to known setjmp-like function names. clang however does not do this reliably, at least not with -ffreestanding and possibly under other conditions, resulting in silent emission of wrong code. since the symbol name setjmp is in no way special (setjmp is specified as a macro that could expand to use any implementation-specific symbol name or names), a compiler is justified not to do anything special without further hints, and it's reasonable to do what we can to provide such hints. gcc 4.0.x and earlier do not recognize the attribute, so make use conditional on __GNUC__ macros. clang and other gcc-like compilers report (and have always reported) a later "GNUC" version so the preprocessor conditional should function as desired for them as too. undefine the internal macro after use so that nothing abuses it as a public feature. |
||
|---|---|---|
| arch | ||
| compat/time32 | ||
| crt | ||
| dist | ||
| include | ||
| ldso | ||
| src | ||
| tools | ||
| .gitignore | ||
| .mailmap | ||
| configure | ||
| COPYRIGHT | ||
| dynamic.list | ||
| INSTALL | ||
| Makefile | ||
| README | ||
| VERSION | ||
| WHATSNEW | ||
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/