pkg/52452: qt3-tools build 'uic' stuck in "fdclose" w/modular Xorg on i386-8.0_BETA and i386-8.99.1

[jdbaker%mylinuxisp.com@localhost]

>Number:         52452
>Category:       pkg
>Synopsis:       qt3-tools build 'uic' stuck in "fdclose" w/modular Xorg on i386-8.0_BETA and i386-8.99.1
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Aug 02 02:50:00 +0000 2017
>Originator:     John D. Baker
>Release:        NetBSD/i386-8.0_BETA, NetBSD/i386-8.99.1, pkgsrc-2017Q1, pkgsrc-2017Q2
>Organization:
>Environment:
NetBSD plex760.technoskunk.fur 8.0_BETA NetBSD 8.0_BETA (GENERIC_PAE) #89: Wed Jul 26 19:42:40 CDT 2017  sysop%x3650.technoskunk.fur@localhost:/r1/build/netbsd-8/obj/i386/sys/arch/i386/compile/GENERIC_PAE i386

NetBSD avaya.technoskunk.fur 8.0_BETA NetBSD 8.0_BETA (RACKMOUNT) #91: Wed Jul 26 19:37:08 CDT 2017  sysop%x3650.technoskunk.fur@localhost:/r1/build/netbsd-8/obj/i386/sys/arch/i386/compile/RACKMOUNT i386

et al.
>Description:
While building "x11/qt3-tools" on i386-8.0_BETA or i386-8.99.1, the
local tool 'uic' doesn't terminate, getting stuck in "fdclose" state.

Tail end of build on a system with MAKE_JOBS=5 (hw.ncpu +1):

[...]
gmake[3]: Entering directory '/tmp/pkgsrc/x11/qt3-tools/work/qt-x11-free-3.3.8/tools/designer/designer'
/tmp/pkgsrc/x11/qt3-tools/work/qt-x11-free-3.3.8/bin/uic -L /tmp/pkgsrc/x11/qt3-tools/work/qt-x11-free-3.3.8/plugins listboxeditor.ui -o listboxeditor.h
/tmp/pkgsrc/x11/qt3-tools/work/qt-x11-free-3.3.8/bin/uic -L /tmp/pkgsrc/x11/qt3-tools/work/qt-x11-free-3.3.8/plugins editfunctions.ui -o editfunctions.h
/tmp/pkgsrc/x11/qt3-tools/work/qt-x11-free-3.3.8/bin/uic -L /tmp/pkgsrc/x11/qt3-tools/work/qt-x11-free-3.3.8/plugins newform.ui -o newform.h
/tmp/pkgsrc/x11/qt3-tools/work/qt-x11-free-3.3.8/bin/uic -L /tmp/pkgsrc/x11/qt3-tools/work/qt-x11-free-3.3.8/plugins listvieweditor.ui -o listvieweditor.h
/tmp/pkgsrc/x11/qt3-tools/work/qt-x11-free-3.3.8/bin/uic -L /tmp/pkgsrc/x11/qt3-tools/work/qt-x11-free-3.3.8/plugins customwidgeteditor.ui -o customwidgeteditor.h

'top' reports:
$ top -n -t | grep uic$
11734     1 sysop     95 fdclos/0   0:00  0.00%  0.00% -         uic
 5594     1 sysop     95 fdclos/0   0:00  0.00%  0.00% -         uic
13326     1 sysop     95 fdclos/0   0:00  0.00%  0.00% -         uic
14376     1 sysop     95 fdclos/0   0:00  0.00%  0.00% -         uic
25508     1 sysop     95 fdclos/0   0:00  0.00%  0.00% -         uic
 3684     1 sysop     85 fdclos/0   0:00  0.00%  0.00% -         uic
 7410     1 sysop     85 fdclos/0   0:00  0.00%  0.00% -         uic
19371     1 sysop     85 fdclos/0   0:00  0.00%  0.00% -         uic
13609     1 sysop     85 fdclos/0   0:00  0.00%  0.00% -         uic
 3298     1 sysop     85 fdclos/0   0:00  0.00%  0.00% -         uic

This only occurs on systems with modular Xorg
("meta-pkgs/modular-xorg").

Systems with native Xorg do not exhibit this problem.

>How-To-Repeat:
Attempt to build "x11/qt3-tools" on i386-8.0_BETA or i386-8.99.1 systems
with modular Xorg.
>Fix:
Please.