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Details

Type: Bug
Resolution: Done
Priority: P3: Somewhat important
Fix Version/s: 5.6.3
Affects Version/s: 5.6.2, 5.8.0 Beta
Component/s: Build System, Charts, Location
Labels:
None
Environment:
Building on Ubuntu 14.04 using g++ for arm,
arm-angstrom-linux-gnueabi-g++ (Linaro GCC 4.7-2013.07) 4.7.4 20130626

Building for Desktop on Ubuntu 14.04 using default g++ 4.9.4

Description

I'm building Qt from the source package qt-everywhere-opensource-src-5.6.2.tar.gz. I'm configuring Qt to define qreal as float, as floats are significantly faster on the platform I am building this for.

./configure -qreal float etc

This gives a compile error in qdeclarativegeomap.cpp as shown below. Isn't float supported for qreal anymore?

'''
qdeclarativegeomap.cpp: In member function ‘void QDeclarativeGeoMap::fitViewportToGeoShape()’:
qdeclarativegeomap.cpp:893:38: error: no matching function for call to ‘qMax(qreal, double)’
qdeclarativegeomap.cpp:893:38: note: candidate is:
In file included from /home/xxx/qt-everywhere-opensource-src-5.6.2/qtbase/include/QtCore/qglobal.h:1:0,
                 from /home/xxx/src/pd/pdrepos02/scripts/qt/qt-everywhere-opensource-src-5.6.2/qtbase/include/QtCore/../../src/corelib/thread/qatomic.h:34,
                 from /home/xxx/qt-everywhere-opensource-src-5.6.2/qtbase/include/QtCore/qatomic.h:1,
                 from /home/xxx/qt-everywhere-opensource-src-5.6.2/qtbase/include/QtCore/../../src/corelib/kernel/qvariant.h:37,
                 from /home/xxx/qt-everywhere-opensource-src-5.6.2/qtbase/include/QtCore/qvariant.h:1,
                 from /home/xxx/qt-everywhere-opensource-src-5.6.2/qtbase/include/QtCore/QVariant:1,
                 from ../../location/maps/qgeoserviceprovider.h:40,
                 from qdeclarativegeomap_p.h:51,
                 from qdeclarativegeomap.cpp:37:
/home/xxx/qt-everywhere-opensource-src-5.6.2/qtbase/include/QtCore/../../src/corelib/global/qglobal.h:547:34: note: template<class T> constexpr const T& qMax(const T&, const T&)
/home/xxx/qt-everywhere-opensource-src-5.6.2/qtbase/include/QtCore/../../src/corelib/global/qglobal.h:547:34: note:   template argument deduction/substitution failed:
qdeclarativegeomap.cpp:893:38: note:   deduced conflicting types for parameter ‘const T’ (‘float’ and ‘double’)
make[4]: *** [.obj/qdeclarativegeomap.o] Error 1
'''