gnucash @5.0_1: error: no template named 'unary_function' in namespace 'std'

[tenzap]

Gnucash 5.0 doesn't build anymore on macOS 10.11 (el capitan) I'm stuck on El Capitan because my device can't be upgraded, so it would be great if gnucash 5.0 could build on 10.11

Error:

[ 23%] Generating ../../../share/guile/site/2.2/gnucash/qif-import/qif-objects.scm
cd /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_gnome_gnucash/gnucash/work/build/gnucash/import-export/qif-imp && /opt/local/bin/cmake -E create_symlink /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_gnome_gnucash/gnucash/work/gnucash-5.0/gnucash/import-export/qif-imp/qif-objects.scm /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_gnome_gnucash/gnucash/work/build/share/guile/site/2.2/gnucash/qif-import/qif-objects.scm
In file included from /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_gnome_gnucash/gnucash/work/gnucash-5.0/libgnucash/engine/test-core/test-engine-stuff.cpp:39:
In file included from /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_gnome_gnucash/gnucash/work/gnucash-5.0/libgnucash/engine/kvp-frame.hpp:87:
In file included from /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_gnome_gnucash/gnucash/work/gnucash-5.0/libgnucash/engine/kvp-value.hpp:30:
In file included from /opt/local/libexec/boost/1.71/include/boost/variant.hpp:17:
In file included from /opt/local/libexec/boost/1.71/include/boost/variant/variant.hpp:21:
In file included from /opt/local/libexec/boost/1.71/include/boost/type_index.hpp:29:
In file included from /opt/local/libexec/boost/1.71/include/boost/type_index/stl_type_index.hpp:47:
/opt/local/libexec/boost/1.71/include/boost/container_hash/hash.hpp:130:33: error: no template named 'unary_function' in namespace 'std'; did you mean '__unary_function'?
        struct hash_base : std::unary_function<T, std::size_t> {};
                           ~~~~~^~~~~~~~~~~~~~
                                __unary_function
/opt/local/libexec/llvm-16/bin/../include/c++/v1/__functional/unary_function.h:46:1: note: '__unary_function' declared here
using __unary_function = __unary_function_keep_layout_base<_Arg, _Result>;
^

You might also have a look at the logs on the officialn builders

[ryandesign (Ryan Carsten Schmidt)]

The Portfile sets compiler.cxx_standard 2017 and I see -std=c++17 in the log.

The Internet tells me std::unary_function is deprecated in C++11 and removed in C++17.

So this is not a situation of El Capitan being too old. On the contrary, it's a situation where the compiler we're using to support those old systems (Clang 16 in this case) is so new that it has removed support for unary_function which boost, which gnucash depends on, uses. I think the Xcode clang versions we're using on newer macOS versions already support C++17 but aren't new enough that they removed unary_function, but they will start failing too once we update to newer versions of Xcode.

gnucash is using boost 1.71 which is old. The ​upstream PR about this issue has been merged so it should either be fixed in the latest boost or the next boost to be released; gnucash could switch to newer boost.

[ryandesign (Ryan Carsten Schmidt)]

The port was updated to 5.3 last week but this problem remains on High Sierra and earlier.

[drkp (Dan Ports)]

I believe this is fixed now because this error comes from boost171 and gnucash now uses boost176, which has patches for clang16/C++17 that provide std::unary_function unconditionally.