maintainer-feedback requested: [Bug 208908] lang/beignet: Fix build with libc++ 3.8.0

[bugzilla-noreply at freebsd.org]

Dimitry Andric <dim at FreeBSD.org> has reassigned Bugzilla Automation
<bugzilla at FreeBSD.org>'s request for maintainer-feedback to x11 at FreeBSD.org:
Bug 208908: lang/beignet: Fix build with libc++ 3.8.0
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208908



--- Description ---
Created attachment 169455
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=169455&action=edit
Replace abs() on unsigned arguments in lang/beignet

During the exp-run in bug 208158, it was found that lang/beignet gives errors
with libc++ 3.8.0 [1]:

/wrkdirs/usr/ports/lang/beignet/work/Beignet-1.1.1-Source/backend/src/backend/g
en_insn_selection.cpp:1156:27:
error: call to 'abs' is ambiguous
    insn->extra.longjmp = abs(index - origin) > 800;
			  ^~~

This is because abs() is being called with unsigned arguments.	Fix this by
calculating the unsigned difference in a safe manner.

[1]
http://package18.nyi.freebsd.org/data/headamd64PR208158-default/2016-03-22_18h3
0m05s/logs/errors/beignet-1.1.1.log