Re: [gentoo-musl] Re: [GSoC] native-clang: daily report 06/29

[Felix Janda]

Lei Zhang wrote:
> 2016-06-30 23:50 GMT+08:00 Luca Barbato <lu_zero@g.o>:
> > On 30/06/16 17:40, Lei Zhang wrote:
> >> I also noticed that gcc's sanitizer doesn't work on the musl based
> >> system, so is it forgivable to not support clang's sanitizer either?
> >> (clang's sanitizer is implemented in compiler-rt)
> >
> > package mask the useflag for now, it is less important.
> >
> > Make sure to open a bug about it on llvm and gcc.
>
> compiler-rt's sanitizer uses some non-POSIX features like <obstack.h>;
> I guess gcc's situation is similar. It's not necessarily a bug though.
>
> Actually compiler-rt uses stuff like "#if __linux__ && !__ANDROID__"
> to protect code that uses GNU extensions. The fix is simple: replace
> it with "#ifdef __GLIBC__". But I'm not sure if this fix has unwanted
> impact on other libc like uclibc. It looks uclibc supports certain GNU
> extensions that are absent in musl, like <obstack.h>.

uclibc defines also __GLIBC__. So changing from
"#if __linux__ && !__ANDROID__" to "#ifdef __GLIBC__" doesn't mean any
change for uclibc. (Code not working on uclibc would need to use
"#if __GLIBC__ && !__UCLIBC__".) However notice that there are non-linux
systems using glibc (kFreeBSD & Hurd), so (if they are relevant here)
the test might need to be "#if __linux__ && __GLIBC__".

Felix