pkg/50284: www/webkit-gtk build fails on NetBSD/i386 7.0

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

>Number:         50284
>Category:       pkg
>Synopsis:       www/webkit-gtk build fails on NetBSD/i386 7.0
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Sep 27 13:55:00 +0000 2015
>Originator:     Izumi Tsutsui
>Release:        NetBSD 7.0 + pkgsrc-2015Q3
>Organization:
>Environment:
System: NetBSD mirage 7.0 NetBSD 7.0 (GENERIC.201509250726Z) i386
Architecture: i386
Machine: i386
>Description:
www/webkit-gtk build fails on NetBSD/i386 7.0 as following:
---
 :

[ 99%] Building CXX object Source/WebKit2/CMakeFiles/WebKit2.dir/__/__/DerivedSources/WebKit2/WebPageGroupProxyMessageReceiver.cpp.o
[ 99%] Linking CXX shared library ../../lib/libwebkit2gtk-4.0.so
ld: cannot find -latomic
Source/WebKit2/CMakeFiles/WebKit2.dir/build.make:18464: recipe for target 'lib/libwebkit2gtk-4.0.so.37.6.8' failed
gmake[2]: *** [lib/libwebkit2gtk-4.0.so.37.6.8] Error 1
CMakeFiles/Makefile2:958: recipe for target 'Source/WebKit2/CMakeFiles/WebKit2.dir/all' failed
gmake[1]: *** [Source/WebKit2/CMakeFiles/WebKit2.dir/all] Error 2
Makefile:149: recipe for target 'all' failed
gmake: *** [all] Error 2
*** Error code 2

Stop.
make[2]: stopped in /usr/pkgsrc/www/webkit-gtk
*** Error code 1

---

Note build on NetBSD/amd64 7.0 from the same pkgsrc tree works fine.

>How-To-Repeat:
(cd pkgsrc/www/webkit-gtk && make package)
on NetBSD/i386 7.0

>Fix:
Buildlink devel/libatomic_ops for architectures without 64 bit atomic ops?