Bug#1122419: gnuplot-iostream: FTBFS: /usr/include/armadillo_bits/compiler_check.hpp:82:4: error: #error "*** C++14 compiler required; enable C++14 mode in your compiler, or use an earlier version of Armadillo"

[Santiago Vila]

Package: src:gnuplot-iostream
Version: 0~20140302.gitc8919a0+dfsg-4
Severity: serious
Tags: ftbfs forky sid

Dear maintainer:

During a rebuild of all packages in unstable, this package failed to build.

Below you will find the last part of the build log (probably the most
relevant part, but not necessarily). If required, the full build log
is available here:

https://people.debian.org/~sanvila/build-logs/202512/

About the archive rebuild: The build was made on virtual machines from AWS,
using sbuild and a reduced chroot with only build-essential packages.

If you cannot reproduce the bug please contact me privately, as I
am willing to provide ssh access to a virtual machine where the bug is
fully reproducible.

If this is really a bug in one of the build-depends, please use
reassign and add an affects on src:gnuplot-iostream, so that this is still
visible in the BTS web page for this package.

Thanks.

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[...]
 debian/rules clean
dh clean
   dh_auto_clean
	make -j2 clean
make[1]: Entering directory '/<<PKGBUILDDIR>>'
rm -f *.o
rm -f *.error.txt
rm -f example-misc example-data-1d example-data-2d example-interactive test-noncopyable test-outputs
# Windows compilation
rm -f *.exe *.obj
# files created by demo scripts
rm -f my_graph_*.png external_binary.dat external_binary.gnu external_text.dat external_text.gnu inline_binary.gnu inline_text.gnu
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
   dh_clean
 debian/rules binary
dh binary
   dh_update_autotools_config
   dh_autoreconf
   dh_auto_configure
   dh_auto_build
	make -j2 INSTALL="install --strip-program=true"
make[1]: Entering directory '/<<PKGBUILDDIR>>'
g++ -g -O2 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -I/usr/include/hdf5/serial -g -O2 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -I/usr/include/hdf5/serial  --std=c++11 -DUSE_ARMA=1 -c example-misc.cc -o example-misc.o
g++ -g -O2 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -I/usr/include/hdf5/serial -g -O2 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -I/usr/include/hdf5/serial  --std=c++11 -DUSE_ARMA=1 -c example-data-1d.cc -o example-data-1d.o
In file included from /usr/include/armadillo:27,
                 from example-data-1d.cc:41:
/usr/include/armadillo_bits/compiler_check.hpp:82:4: error: #error "*** C++14 compiler required; enable C++14 mode in your compiler, or use an earlier version of Armadillo"
   82 |   #error "*** C++14 compiler required; enable C++14 mode in your compiler, or use an earlier version of Armadillo"
      |    ^~~~~
In file included from /usr/include/boost/bind/detail/requires_cxx11.hpp:9,
                 from /usr/include/boost/bind/bind.hpp:24,
                 from /usr/include/boost/bind.hpp:29,
                 from example-data-1d.cc:38:
/usr/include/boost/bind.hpp:36:1: note: ‘#pragma message: The practice of declaring the Bind placeholders (_1, _2, ...) in the global namespace is deprecated. Please use <boost/bind/bind.hpp> + using namespace boost::placeholders, or define BOOST_BIND_GLOBAL_PLACEHOLDERS to retain the current behavior.’
   36 | BOOST_PRAGMA_MESSAGE(
      | ^~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/armadillo:501:
/usr/include/armadillo_bits/fn_accu.hpp:27:1: error: ‘accu’ function uses ‘auto’ type specifier without trailing return type
   27 | auto
      | ^~~~
/usr/include/armadillo_bits/fn_accu.hpp:27:1: note: deduced return type only available with ‘-std=c++14’ or ‘-std=gnu++14’
/usr/include/armadillo_bits/fn_accu.hpp:42:1: error: ‘accu’ function uses ‘auto’ type specifier without trailing return type
   42 | auto
      | ^~~~
/usr/include/armadillo_bits/fn_accu.hpp:42:1: note: deduced return type only available with ‘-std=c++14’ or ‘-std=gnu++14’
/usr/include/armadillo_bits/fn_accu.hpp:57:1: error: ‘accu’ function uses ‘auto’ type specifier without trailing return type
   57 | auto
      | ^~~~
/usr/include/armadillo_bits/fn_accu.hpp:57:1: note: deduced return type only available with ‘-std=c++14’ or ‘-std=gnu++14’
make[1]: *** [Makefile:42: example-data-1d.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
dh_auto_build: error: make -j2 INSTALL="install --strip-program=true" returned exit code 2
make: *** [debian/rules:8: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2
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