[Debichem-devel] Bug#831086: bagel: FTBFS with GCC 6: mpicxx.h:21:4: error: #error 'Please use the same version of GCC and g++ for compiling MPICH and user MPI programs'

[Lucas Nussbaum]

Source: bagel
Version: 0.0~git20160507-2
Severity: serious
Tags: stretch sid
User: debian-qa at lists.debian.org
Usertags: qa-ftbfs-20160713 qa-ftbfs
Justification: FTBFS with GCC 6 on amd64

Hi,

During a rebuild of all packages in sid using the gcc-defaults package
available in experimental to make GCC default to version 6, your package failed
to build on amd64. For more information about GCC 6 and Stretch, see:
- https://wiki.debian.org/GCC6
- https://lists.debian.org/debian-devel-announce/2016/06/msg00007.html

Relevant part (hopefully):
> /bin/bash ../../../libtool  --tag=CXX   --mode=compile mpicxx -DHAVE_CONFIG_H -I. -I../../..   -std=c++11 -Wdate-time -D_FORTIFY_SOURCE=2 -I../../.. -g -O2 -DNDEBUG -c -o process.lo process.cc
> libtool: compile:  mpicxx -DHAVE_CONFIG_H -I. -I../../.. -std=c++11 -Wdate-time -D_FORTIFY_SOURCE=2 -I../../.. -g -O2 -DNDEBUG -c process.cc -o process.o
> In file included from /usr/include/mpich/mpi.h:2231:0,
>                  from ../../../src/util/parallel/mpi_interface.h:36,
>                  from process.cc:27:
> /usr/include/mpich/mpicxx.h:21:4: error: #error 'Please use the same version of GCC and g++ for compiling MPICH and user MPI programs'
>  #  error 'Please use the same version of GCC and g++ for compiling MPICH and user MPI programs'
>     ^~~~~
> make[5]: *** [process.lo] Error 1

The full build log is available from:
   http://people.debian.org/~lucas/logs/2016/07/13/bagel_0.0~git20160507-2_unstable_gcc6.log

A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!

About the archive rebuild: The rebuild was done on EC2 VM instances from
Amazon Web Services, using a clean, minimal and up-to-date chroot. Every
failed build was retried once to eliminate random failures.