From: Uwe Hermann <uwe@hermann-uwe.de>
Date: Fri, 30 Jan 2015 18:39:30 +0000 (+0100)
Subject: Fix the build for older glibmm versions.
X-Git-Url: http://git.code-monkey.de/?p=pulseview.git;a=commitdiff_plain;h=0aff286e72c0fb99e2dfeed565a8f5470b2296f0;hp=0aff286e72c0fb99e2dfeed565a8f5470b2296f0

Fix the build for older glibmm versions.

With older glibmm versions the following error occured:

  pv/toolbars/mainbar.cpp:228:6: error: no match for ‘operator!’ (operand
  type is ‘Glib::VariantContainerBase’)
    if (!gvar_dict) {
        ^

Work around the above issue by using .gobj() and not relying on
"Glib::VariantBase::operator BoolExpr() const", which was only
added in glibmm 2.36.

This fixes bug #548.

Tested on a Debian stable system with glibmm 2.32.1 and Boost 1.49.
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