pkg/53936: pkgsrc/x11/qt5-qtbase build fails on NetBSD/amd64 7.2

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

>Number:         53936
>Category:       pkg
>Synopsis:       pkgsrc/x11/qt5-qtbase build fails on NetBSD/amd64 7.2
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Feb 03 04:25:00 +0000 2019
>Originator:     Izumi Tsutsui
>Release:        NetBSD 7.2 + pkgsrc-2018Q4
>Organization:
>Environment:
System: NetBSD 7.2
Architecture: x86_64
Machine: amd64
>Description:
pkgsrc/x11/qt5-qtbase build fails on NetBSD/amd64 7.x as pkgbuild reports:
 http://mail-index.netbsd.org/pkgsrc-bulk/2019/01/31/msg016951.html
 http://nyftp.netbsd.org/pub/pkgsrc/packages/reports/2018Q4/NetBSD-7.0-x86_64/20190129.1456/qt5-qtbase-5.12.0/configure.log

> => Checking for portability problems in extracted files
> Creating qmake...
> In file included from /work/x11/qt5-qtbase/work/qtbase-everywhere-src-5.12.0/include/QtCore/qendian.h:1:0,
>                  from /work/x11/qt5-qtbase/work/qtbase-everywhere-src-5.12.0/src/corelib/codecs/qutfcodec.cpp:43:
> /work/x11/qt5-qtbase/work/qtbase-everywhere-src-5.12.0/include/QtCore/../../src/corelib/global/qendian.h:165:61: error: redeclaration 'constexpr T qbswap(T) [with T = qfloat16]' differs in 'constexpr'
>  template <> inline qfloat16 qbswap<qfloat16>(qfloat16 source)
 :

Note no problem on NetBSD/amd64 8.0.
 
>How-To-Repeat:
See above.

>Fix:

Adding
> GCC_REQD+= 5.0
to pkgsrc/x11/qt5-qtbase/Makefile.common fixes the problem
(confirmed by isaki@ on NetBSD/amd64 7.2),
though not confirmed the exact REQD version for current Qt packages.