Bug#853698: vdr: ftbfs with GCC-7

[Matthias Klose]

Package: src:vdr
Version: 2.2.0-6
Severity: normal
Tags: sid buster
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-7

Please keep this issue open in the bug tracker for the package it
was filed for.  If a fix in another package is required, please
file a bug for the other package (or clone), and add a block in this
package. Please keep the issue open until the package can be built in
a follow-up test rebuild.

The package fails to build in a test rebuild on at least amd64 with
gcc-7/g++-7, but succeeds to build with gcc-6/g++-6. The
severity of this report may be raised before the buster release.
There is no need to fix this issue in time for the stretch release.

The full build log can be found at:
http://people.debian.org/~doko/logs/gcc7-20170126/vdr_2.2.0-6_unstable_gcc7.log
The last lines of the build log are at the end of this report.

To build with GCC 7, either set CC=gcc-7 CXX=g++-7 explicitly,
or install the gcc, g++, gfortran, ... packages from experimental.

  apt-get -t=experimental install g++ 

Common build failures are new warnings resulting in build failures with
-Werror turned on, or new/dropped symbols in Debian symbols files.
For other C/C++ related build failures see the porting guide at
http://gcc.gnu.org/gcc-7/porting_to.html

[...]
      frequency = abs(frequency); // Allow for C-band, where the frequency is less than the LOF
                               ^
In file included from /usr/include/c++/7/cstdlib:75:0,
                 from /usr/include/c++/7/stdlib.h:36,
                 from config.h:15,
                 from channels.h:13,
                 from device.h:13,
                 from dvbdevice.h:15,
                 from dvbdevice.c:10:
/usr/include/stdlib.h:735:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/include/c++/7/cstdlib:77:0,
                 from /usr/include/c++/7/stdlib.h:36,
                 from config.h:15,
                 from channels.h:13,
                 from device.h:13,
                 from dvbdevice.h:15,
                 from dvbdevice.c:10:
/usr/include/c++/7/bits/std_abs.h:56:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
/usr/include/c++/7/bits/std_abs.h:61:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/include/c++/7/bits/std_abs.h:70:3: note: candidate: constexpr double std::abs(double)
   abs(double __x)
   ^~~
/usr/include/c++/7/bits/std_abs.h:74:3: note: candidate: constexpr float std::abs(float)
   abs(float __x)
   ^~~
/usr/include/c++/7/bits/std_abs.h:78:3: note: candidate: constexpr long double std::abs(long double)
   abs(long double __x)
   ^~~
/usr/include/c++/7/bits/std_abs.h:84:3: note: candidate: constexpr __int128 std::abs(__int128)
   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
   ^~~
/usr/include/c++/7/bits/std_abs.h:102:3: note: candidate: constexpr __float128 std::abs(__float128)
   abs(__float128 __x)
   ^~~
Makefile:124: recipe for target 'dvbdevice.o' failed
make[2]: *** [dvbdevice.o] Error 1
make[2]: Leaving directory '/<<PKGBUILDDIR>>'
dh_auto_build: make -j1 PREFIX=/usr VIDEODIR=/var/lib/video LIBDIR=/usr/lib/vdr/plugins SDNOTIFY=1 returned exit code 2
debian/rules:17: recipe for target 'override_dh_auto_build' failed
make[1]: *** [override_dh_auto_build] Error 2
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
debian/rules:14: recipe for target 'build' failed
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2