Date: Wed, 18 Feb 2015 16:04:29 +0200 From: Sergey Dmitrouk <sdmitrouk@...esssoftek.com> To: <musl@...ts.openwall.com> Subject: Re: wchar_t and -fshort-wchar OK, I see, thanks for the explanation. I agree there are problems with short wchar_t, but in my specific case they are mostly irrelevant (no need for dynamic loader or conversions that involve code points with values above 0xffff). I mainly wanted to inform you about this build issue, in case you would like to do something about it. On Wed, Feb 18, 2015 at 03:54:13AM -0800, Szabolcs Nagy wrote: > * Sergey Dmitrouk <sdmitrouk@...esssoftek.com> [2015-02-18 12:53:37 +0200]: > > musl seems to build fine with -fshort-wchar, but when client applications > > that cannot possibly work > > wchar_t is assumed to be a unicode code point so short wchar_t is broken > > > are built against musl all uses of wide character literals fail due to wide > > type defined internally by a compiler differs from the type of `wchar_t` in > > musl headers. > > > > I faced this on ARM where `wchar_t` is defined as `unsigned int` by > > musl but it's `unsigned short` from compilers point of view. I'd expect > > similar issues with other targets. > > > > http://arminfo.emea.arm.com/help/topic/com.arm.doc.ihi0042e/IHI0042E_aapcs.pdf > > says > > "The preferred type of wchar_t is unsigned int. However, > a virtual platform may elect to use unsigned short instead. > A platform standard must document its choice" > > on musl/glibc/.. the platform standard is unsigned int > > > Would it make sense to use `__WCHAR_TYPE__` for `wchar_t` when it's > > available (it's already used for i386, but for different reason)? > > Presumably, as compiler is responsible for creating wide literals, libc > > would better agree with it on the type. > > > > Of course, this makes sense only if you intend to support builds with > > `-fshort-wchar` flag, which are not very common I believe. > > > > this is an abi change so a different loader path name etc should be > used then (you should create a new subarch in musl's terminology) > > but i'm not sure how you plan to fix up mb to wc functions for > such a subarch.. > > > Best regards, > > Sergey
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