Bug#1033702: freefem++: autopkgtest regression: warnings on stderr

[Paul Gevers]

Source: freefem++
Version: 4.11+dfsg1-2
Severity: serious
Control: tags -1 bookworm-ignore
User: debian-ci at lists.debian.org
Usertags: fails-always

Dear maintainer(s),

Your package has an autopkgtest, great. However, it started to fail in 
August 2022 on amd64, armhf and i386. Can you please investigate the 
situation and fix it? I copied some of the output at the bottom of this 
report.

The release team has announced [1] that failing autopkgtest on amd64 and 
arm64 are considered RC in testing. [Release Team hat on] Because of the 
timing (we're in hard freeze) I've marked this bug as bookworm-ignore as 
the problem is "only" warnings. A targeted fix is still welcome (adding 
allow-stderr restriction for the test, code fixing needs to wait until 
the release).

More information about this bug and the reason for filing it can be 
found on 
https://wiki.debian.org/ContinuousIntegration/RegressionEmailInformation

Paul

[1] https://lists.debian.org/debian-devel-announce/2019/07/msg00002.html

https://ci.debian.net/data/autopkgtest/testing/amd64/f/freefem++/32183287/log.gz

build-and-run-lib    FAIL stderr: In file included from 
/usr/include/freefem++/AFunction.hpp:93,
autopkgtest [16:24:09]: test build-and-run-lib:  - - - - - - - - - - 
stderr - - - - - - - - - -
In file included from /usr/include/freefem++/AFunction.hpp:93,
                  from /usr/include/freefem++/ff++.hpp:21,
                  from 
/tmp/autopkgtest-lxc.okwz3yij/downtmp/build.NQ2/src/plugin/seq/myfunction.cpp:30:
/usr/include/freefem++/String.hpp:195:19: warning: ‘template<class 
_Arg1, class _Arg2, class _Result> struct std::binary_function’ is 
deprecated [-Wdeprecated-declarations]
   195 | struct pairless : binary_function<pair<A,B>,const char *, bool>
       |                   ^~~~~~~~~~~~~~~
In file included from /usr/include/c++/12/string:48,
                  from /usr/include/c++/12/bits/locale_classes.h:40,
                  from /usr/include/c++/12/bits/ios_base.h:41,
                  from /usr/include/c++/12/ios:42,
                  from /usr/include/c++/12/istream:38,
                  from /usr/include/c++/12/fstream:38,
                  from /usr/include/freefem++/ff++.hpp:12:
/usr/include/c++/12/bits/stl_function.h:131:12: note: declared here
   131 |     struct binary_function
       |            ^~~~~~~~~~~~~~~
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