November 5th is Clang-Day

David Naylor naylor.b.david at
Sat Nov 3 07:48:52 UTC 2012

On Friday, 2 November 2012 10:13:30 David Chisnall wrote:
> On 2 Nov 2012, at 05:24, Jan Beich wrote:
> >> Known Issues
> > 
> > emulators/wine doesn't work with lib32 built by clang, probably due to
> > wine bugs.
> Is this still the case?  There was an issue preventing WINE from working
> because it required stricter stack alignment than clang provided by
> default, but I thought it was fixed.  Does WINE work if compiled with the
> flag that forces stack realignment?  If not, then it's some other issue...

There are two issues here: 1) wine compiled with clang, and 2) wine (compiled 
with gcc) running on clang compiled base.  

Regarding 1), according to the wiki [1], wine does have stack alignment issues 
and some wine programs do not run when compiled with clang [2][3] and other 
bugs with clang cause freezing within wine [4][5].  The impression I get is 
that, using the work-a-round of stack realignment, wine does work to some 
extent when compiled by clang.  

Regarding 2) (which I believe Jan was referring to), when I have a gcc built 
world and just replace lib32 with clang built libraries I have winecfg and 
regedit launching but displaying black screens.  Switching back to gcc built 
lib32 I get a working winecfg and regedit.  This, to me, indicates a clang 
error somewhere.  

The test was done on FreeBSD 9-Stable with:
# clang --version
FreeBSD clang version 3.1 (branches/release_31 156863) 20120523
Target: x86_64-unknown-freebsd9.0
Thread model: posix


[2] (regedit)
[3] (wineboot)
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