Fails to build with GCC 6: with GCC 6: no match for 'operator<<'

[Bas Couwenberg]

As reported by Martin Michlmayr in ​Debian Bug #811851:

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
...
cd /<<BUILDDIR>>/ossim-1.8.20.3+ds/debian/build/src/ossim && /usr/bin/c++   -DOSSIMMAKINGDLL -Dossim_EXPORTS -I/<<BUILDDIR>>/ossim-1.8.20.3+ds/ossim/include -I/<<BUILDDIR>>/ossim-1.8.20.3+ds/debian/build/include -I/usr/include/geos -I/usr/include/geotiff -I/usr/include/x86_64-linux-gnu -I/usr/include/freetype2  -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2  -O3 -DNDEBUG -fPIC    -o CMakeFiles/ossim.dir/font/ossimFont.cpp.o -c /<<BUILDDIR>>/ossim-1.8.20.3+ds/ossim/src/ossim/font/ossimFont.cpp
/<<BUILDDIR>>/ossim-1.8.20.3+ds/ossim/src/ossim/elevation/ossimElevManager.cpp: In member function 'virtual std::ostream& ossimElevManager::print(std::ostream&) const':
/<<BUILDDIR>>/ossim-1.8.20.3+ds/ossim/src/ossim/elevation/ossimElevManager.cpp:650:52: error: no match for 'operator<<' (operand types are 'std::basic_ostream<char>' and 'std::ostream {aka std::basic_ostream<char>}')
          out<<"m_dbRoundRobin["<<i<<"]["<<j<<"] = "<<m_dbRoundRobin[i][j]->print(out)<<endl;
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[rashadkm]

Bas,

is there a chroot in debian where I can get the same environment with gcc 6 ?

[Bas Couwenberg]

You can setup an Debian unstable VM and add the experimental repository.

Or you can create an experimental cowbuilder chroot which creates an unstable chroot with the experimental repository in addition to sid.

[rashadkm]

attached patch fixed the compilation for me. I had tested ossim-info after build and it worked fine.

[Bas Couwenberg]

Thanks for the patch, I've added it to the Debian package to resolve the bugreport.

My apologies for taking this long, this issue had fallen off my radar. Today the Debian bugreport severity was raised to Release Critical bringing it back on the radar.

[rashadkm]

Hello Bas,

No problem. the trac notification does not work for me too. there is a better fix in ossim dev branch

If had tested this and it works. If you need i can update the patch if not too late for inclusion

[Bas Couwenberg]

If there is a better patch that can be backported to 1.8.20, I'm happy to replace the fix-ossim-trac-2354.diff patch in the ossim Debian package.

Which commit(s) are you referring to?

[rashadkm]

these two

​https://github.com/ossimlabs/ossim/commit/6a3d0bc96cf42488dcdcdb367a1801783ed8caee ​https://github.com/ossimlabs/ossim/commit/f130f67c5551df7c7dea0dd518a007ebb1b75360

[Bas Couwenberg]

Thanks for the updated patch, I've updated the ossim Debian package to accordingly, see:

​https://anonscm.debian.org/cgit/pkg-grass/ossim.git/commit/?id=5415e7729e332e4c9e436b0daf93a9f157967629