[cfe-dev] [libc++] Running tests from cmake?

[David Chisnall]

On 19 Sep 2011, at 17:14, Ruben Van Boxem wrote:

> 2011/9/19 David Chisnall <theraven at sucs.org>
> On 19 Sep 2011, at 16:14, Ruben Van Boxem wrote:
> 
> > > > I've been working on the FreeBSD port of libc++, and have now finished implementing all of the xlocale APIs that libc++ requires
> >
> > How applicable is that BSD code to, say, Windows?
> 
> Unless someone wants to port FreeBSD libc to Windows... not very.  It's pretty deeply interwoven with standard libc functionality, so it would be very difficult to extract it as a stand-alone library.
> 
> So if I understand what you did correctly, you implemented some/most of the functions listed here:
> http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man3/xlocale.3.html

Yes.

> And then libc++ locale stuff works?

Well, it compiles.  Once I've got the tests working, I'll know if it works, but I want to add a couple of things to libcxxrt to support exception_ptr and tweak libc++ to be able to use libcxxrt easily before I get that far.

> Anything else that might be necessary and unpresent on win32?

Well, exceptions are a very platform-specific, they'd likely need a lot of work to run on Win32.  I'd be more inclined to look at Win64, since it has a vaguely sane EH ABI (win32 has 3, mutually incompatible, EH ABIs, none of which is even approximately sane).

I also had to add some stubs to FreeBSD's libm[1], since it lacks a lot of the long double variants of functions that were added with C99.  Since Windows doesn't come with a C99 implementation, I wouldn't be surprised if these were missing there too, although a quick look on MSDN indicates that they do.  

Those were the only two places where libc++ didn't work out of the box on FreeBSD.  That doesn't necessarily mean anything for porting to other platforms though - there's very little divergence between Darwin and FreeBSD userlands, so code is generally easier to port between the two than between any other pair of operating systems.

David

[1] Any Apple people: it would be really great if Darwin's libm could be BSD, MIT, or UIUC licensed - these functions are present (and look to be quite nicely optimised) in the Darwin version, but Apple's slapped an APSL on them so we can't use them.