Bug#897889: x42-plugins: ftbfs with GCC-8

[Matthias Klose]

Package: src:x42-plugins
Version: 20170428-1.1
Severity: normal
Tags: sid buster
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-8

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-8/g++-8, but succeeds to build with gcc-7/g++-7. The
severity of this report will be raised before the buster release.

The full build log can be found at:
http://aws-logs.debian.net/2018/05/01/gcc8/x42-plugins_20170428-1.1_unstable_gcc8.log.gz
The last lines of the build log are at the end of this report.

To build with GCC 8, either set CC=gcc-8 CXX=g++-8 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-8/porting_to.html

[...]
src/spectr.c:33:26: note: or use 'j' instead of 'i' for the GNU built-in suffix
 # define _I ((complex_t)(1i))
                          ^~
src/spectr.c:149:61: note: in expansion of macro '_I'
   const complex_t u1 = ab_2 + creal( v) + ab_2 * creal(c) + _I * (cimag( v) + ab_2 * cimag(c));
                                                             ^~
src/spectr.c:33:26: error: unable to find numeric literal operator 'operator""i'
 # define _I ((complex_t)(1i))
                          ^~
src/spectr.c:175:8: note: in expansion of macro '_I'
      + _I * ((fb->f[i].W[b1] * sin_w) + sin_w2);
        ^~
src/spectr.c:33:26: note: add 'using namespace std::complex_literals' (from <complex>) to enable the C++14 user-defined literal suffixes
 # define _I ((complex_t)(1i))
                          ^~
src/spectr.c:175:8: note: in expansion of macro '_I'
      + _I * ((fb->f[i].W[b1] * sin_w) + sin_w2);
        ^~
src/spectr.c:33:26: note: or use 'j' instead of 'i' for the GNU built-in suffix
 # define _I ((complex_t)(1i))
                          ^~
src/spectr.c:175:8: note: in expansion of macro '_I'
      + _I * ((fb->f[i].W[b1] * sin_w) + sin_w2);
        ^~
src/spectr.c:33:26: error: unable to find numeric literal operator 'operator""i'
 # define _I ((complex_t)(1i))
                          ^~
src/spectr.c:177:8: note: in expansion of macro '_I'
      + _I * ((fb->f[i].W[a1] * sin_w) + fb->f[i].W[a2] * sin_w2);
        ^~
src/spectr.c:33:26: note: add 'using namespace std::complex_literals' (from <complex>) to enable the C++14 user-defined literal suffixes
 # define _I ((complex_t)(1i))
                          ^~
src/spectr.c:177:8: note: in expansion of macro '_I'
      + _I * ((fb->f[i].W[a1] * sin_w) + fb->f[i].W[a2] * sin_w2);
        ^~
src/spectr.c:33:26: note: or use 'j' instead of 'i' for the GNU built-in suffix
 # define _I ((complex_t)(1i))
                          ^~
src/spectr.c:177:8: note: in expansion of macro '_I'
      + _I * ((fb->f[i].W[a1] * sin_w) + fb->f[i].W[a2] * sin_w2);
        ^~
make[3]: *** [../robtk/robtk.mk:123: x42/x42-tuna-collection] Error 1
make[3]: Leaving directory '/<<PKGBUILDDIR>>/tuna.lv2'
make[2]: *** [Makefile:17: tuna.lv2] Error 2
make[2]: Leaving directory '/<<PKGBUILDDIR>>'
make[1]: *** [debian/rules:20: override_dh_auto_build] Error 2
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:10: build-arch] Error 2
dpkg-buildpackage: error: debian/rules build-arch subprocess returned exit status 2