Bug#811785: libtuxcap: FTBFS with GCC 6: narrowing conversion

[Martin Michlmayr]

Package: libtuxcap
Version: 1.4.0.dfsg2-2.2
Severity: important
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-6 gcc-6-narrowing

This package fails to build with GCC 6.  GCC 6 has not been released
yet, but it's expected that GCC 6 will become the default compiler for
stretch.

Note that only the first error is reported; there might be more.  You
can find a snapshot of GCC 6 in experimental.  To build with GCC 6,
you can set CC=gcc-6 CXX=g++-6 explicitly.

You may be able to find out more about this issue at
https://gcc.gnu.org/gcc-6/changes.html

> sbuild (Debian sbuild) 0.67.0 (26 Dec 2015) on dl580gen9-02.hlinux
...
> [  7%] Building CXX object tuxcap/lib/CMakeFiles/tuxcap.dir/MemoryImage.o
> cd /<<PKGBUILDDIR>>/debian/tmp-build/tuxcap/lib && /usr/bin/c++   -Dtuxcap_EXPORTS -I/<<PKGBUILDDIR>>/tuxcap/{SDL_INCLUDE_DIR} -I/usr/include/x86_64-linux-gnu/ImageMagick-6 -I/usr/include/ImageMagick-6 -I/usr/include/SDL -I/usr/include/python2.7 -I/<<PKGBUILDDIR>>/tuxcap/include -I/<<PKGBUILDDIR>>/tuxcap/chipmunk -I/<<PKGBUILDDIR>>/tuxcap/hgeparticle -I/<<PKGBUILDDIR>>/tuxcap/pycap  -DNDEBUG -fPIC   -o CMakeFiles/tuxcap.dir/MemoryImage.o -c /<<PKGBUILDDIR>>/tuxcap/lib/MemoryImage.cpp
> /<<PKGBUILDDIR>>/tuxcap/lib/MemoryImage.cpp: In member function 'bool Sexy::MemoryImage::BltRotatedClipHelper(float&, float&, const Rect&, const Rect&, double, Sexy::FRect&, float, float)':
> /<<PKGBUILDDIR>>/tuxcap/lib/MemoryImage.cpp:1507:32: warning: narrowing conversion of '(int)theSrcRect.Sexy::TRect<int>::mWidth' from 'int' to 'float' inside { } [-Wnarrowing]
>   float px[4] = { 0, theSrcRect.mWidth, theSrcRect.mWidth, 0 };
>                      ~~~~~~~~~~~^~~~~~
> 
> /<<PKGBUILDDIR>>/tuxcap/lib/MemoryImage.cpp:1507:51: warning: narrowing conversion of '(int)theSrcRect.Sexy::TRect<int>::mWidth' from 'int' to 'float' inside { } [-Wnarrowing]
>   float px[4] = { 0, theSrcRect.mWidth, theSrcRect.mWidth, 0 };
>                                         ~~~~~~~~~~~^~~~~~
> 
> /<<PKGBUILDDIR>>/tuxcap/lib/MemoryImage.cpp:1508:35: warning: narrowing conversion of '(int)theSrcRect.Sexy::TRect<int>::mHeight' from 'int' to 'float' inside { } [-Wnarrowing]
>   float py[4] = { 0, 0, theSrcRect.mHeight, theSrcRect.mHeight };
>                         ~~~~~~~~~~~^~~~~~~
> 
> /<<PKGBUILDDIR>>/tuxcap/lib/MemoryImage.cpp:1508:55: warning: narrowing conversion of '(int)theSrcRect.Sexy::TRect<int>::mHeight' from 'int' to 'float' inside { } [-Wnarrowing]
>   float py[4] = { 0, 0, theSrcRect.mHeight, theSrcRect.mHeight };
>                                             ~~~~~~~~~~~^~~~~~~
> 
> /<<PKGBUILDDIR>>/tuxcap/lib/MemoryImage.cpp: In member function 'void Sexy::MemoryImage::BltMatrixHelper(Sexy::Image*, float, float, const Sexy::SexyMatrix3&, const Rect&, const Sexy::Color&, int, const Rect&, void*, int, int, bool)':
> /<<PKGBUILDDIR>>/tuxcap/lib/MemoryImage.cpp:1787:2: error: narrowing conversion of '4294967295u' from 'unsigned int' to 'int32_t {aka int}' inside { } [-Wnarrowing]
>   };
>   ^
> 
> /<<PKGBUILDDIR>>/tuxcap/lib/MemoryImage.cpp:1787:2: error: narrowing conversion of '4294967295u' from 'unsigned int' to 'int32_t {aka int}' inside { } [-Wnarrowing]
> /<<PKGBUILDDIR>>/tuxcap/lib/MemoryImage.cpp:1787:2: error: narrowing conversion of '4294967295u' from 'unsigned int' to 'int32_t {aka int}' inside { } [-Wnarrowing]
> /<<PKGBUILDDIR>>/tuxcap/lib/MemoryImage.cpp:1787:2: error: narrowing conversion of '4294967295u' from 'unsigned int' to 'int32_t {aka int}' inside { } [-Wnarrowing]
> tuxcap/lib/CMakeFiles/tuxcap.dir/build.make:425: recipe for target 'tuxcap/lib/CMakeFiles/tuxcap.dir/MemoryImage.o' failed
> make[3]: *** [tuxcap/lib/CMakeFiles/tuxcap.dir/MemoryImage.o] Error 1


-- 
Martin Michlmayr
Linux for HPE Helion, Hewlett Packard Enterprise