[Pixman] Fwd: pixman clang issue

Siarhei Siamashka siarhei.siamashka at gmail.com
Sat Sep 19 21:29:17 PDT 2015

On Thu, 25 Jun 2015 03:15:39 +0100
"Ben Avison" <bavison at riscosopen.org> wrote:

> Forwarding a message received off-list. (Speculation: you need to be
> subscribed to the list before messages will be accepted, and Shane
> isn't?)
> ------- Forwarded message -------
> From: "Shane Burrell" <shane at shaneburrell.com>
> To: bavison at riscosopen.org
> Cc:
> Subject: pixman clang issue
> Date: Thu, 25 Jun 2015 02:57:11 +0100
> I'm using the homebrew built version of pixman and it seems that clang
> doesn't like the inline assembly at line 100 in pixman-mmx.c .
> It produces the following error.
> pixman-mmx.c20: error: constraint 'K' expects an integer constant expression
> : "y" (__A), "K" (__N)
> ^~~
> The error is referenced by others here. 
> https://code.google.com/p/nativeclient/issues/detail?id=4201
> I attempted to submit a bug report via the list but received a bounce
> back.  Just trying to reach someone to see if it is something that can
> be fixed upstream from homebrew or a patch or disabling-mmx is needed.

Thanks for reporting this. Which versions of clang and pixman are you
using? I'm compiling the current pixman master branch from git and my
clang is:
    $ clang -v
    clang version 3.5.0 (tags/RELEASE_350/final)
    Target: x86_64-pc-linux-gnu
    Thread model: posix
    Selected GCC installation: /usr/lib/gcc/x86_64-pc-linux-gnu/4.8.4

Everything works just fine. The configure script reports that MMX is
enabled and the code compiles successfully.

There were some tweaks in pixman in the past, intended to automatically
disable MMX when using compilers, which can't handle it properly:

I suspect that either your version of pixman is too old or your clang
is too old. Or maybe even both of them are too old.

Best regards,
Siarhei Siamashka

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