Bug#802705: musescore: FTBFS while rebuilding against newest Qt5 private headers

[Lisandro Damián Nicanor Pérez Meyer]

Source: musescore
Version: 2.0.2+dfsg-1
Severity: serious
Justification: FTBFS

Hi! Musescore FTBFS when rebuilding against the new Qtbase's private headers:

https://buildd.debian.org/status/package.php?p=musescore

The problem seems to be:

/«BUILDDIR»/musescore-2.0.2+dfsg/libmscore/clef.cpp:58:7: error: narrowing conversion of '-1' from 'int' to 'char' inside { } [-Wnarrowing]
       };



-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (990, 'unstable'), (500, 'buildd-unstable'), (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.2.0-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=es_AR.UTF-8, LC_CTYPE=es_AR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)