Re: Warnings about Boost (warning: The practice of declaring the Bind placeholders (_1, _2, ...) in the global namespace is deprecated)

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On 07/01/2021 19:01, julien2412 wrote:
On pc Debian x86-64 with master sources updated today + make clean && make
(since Boost has been upgraded), I noticed these kinds of warnings:
[CXX] svx/source/fmcomp/fmgridif.cxx
In file included from
/home/julien/lo/libreoffice/svx/source/xoutdev/xattr.cxx:87:
In file included from
/home/julien/lo/libreoffice/external/boost/include/boost/property_tree/json_parser.hpp:30:
In file included from
/home/julien/lo/libreoffice/workdir/UnpackedTarball/boost/boost/property_tree/json_parser.hpp:16:
In file included from
/home/julien/lo/libreoffice/workdir/UnpackedTarball/boost/boost/property_tree/json_parser/detail/read.hpp:13:
In file included from
/home/julien/lo/libreoffice/workdir/UnpackedTarball/boost/boost/property_tree/json_parser/detail/parser.hpp:7:
In file included from
/home/julien/lo/libreoffice/external/boost/include/boost/bind.hpp:30:
/home/julien/lo/libreoffice/workdir/UnpackedTarball/boost/boost/bind.hpp:36:1:
warning: 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. [-W#pragma-messages]
BOOST_PRAGMA_MESSAGE(
^
/home/julien/lo/libreoffice/workdir/UnpackedTarball/boost/boost/config/pragma_message.hpp:24:34:
note: expanded from macro 'BOOST_PRAGMA_MESSAGE'
# define BOOST_PRAGMA_MESSAGE(x) _Pragma(BOOST_STRINGIZE(message(x)))
                                  ^
<scratch space>:36:2: note: expanded from here
  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.")
  ^
[...]
It doesn't prevent LO from building but thought it could be interesting to
pinpoint.

Yeah, that's a general issue since <https://git.libreoffice.org/core/+/e0f1b5bd94550835c639efda4e4c9a801c78dbe9%5E!/> "Upgrade external/boost to latest Boost 1.75.0". But as it doesn't affect --enable-werror, I didn't deem it worthwhile to silence the noise by ignoring -W#pragma-messages in bin/gen-boost-headers (and whatever would be necessary for MSVC). If we hate the noise enough, though, we could presumably patch external/boost's json_parser according to the pragma message ("use <boost/bind/bind.hpp> + using namespace boost::placeholders").

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