[MacPorts] #59575: mariadb-10.2: error: no member named 'ptrdiff_t' in the global namespace, error: unknown type name 'ptrdiff_t'

[MacPorts]

#59575: mariadb-10.2: error: no member named 'ptrdiff_t' in the global namespace,
error: unknown type name 'ptrdiff_t'
---------------------------+-----------------------
  Reporter:  iEFdev        |      Owner:  michaelld
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.6.2
Resolution:                |   Keywords:
      Port:  mariadb-10.2  |
---------------------------+-----------------------

Comment (by jmroot):

 The first error is
 {{{
 :info:build cd
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_databases_mariadb-10.2/mariadb-10.2/work/build/storage/perfschema
 && /opt/local/bin/clang++-mp-9.0  -DHAVE_CONFIG_H -DMYSQL_SERVER
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_databases_mariadb-10.2/mariadb-10.2/work/build/include
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_databases_mariadb-10.2/mariadb-10.2/work/server-10.2
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_databases_mariadb-10.2/mariadb-10.2/work/server-10.2/include
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_databases_mariadb-10.2/mariadb-10.2/work/server-10.2/sql
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_databases_mariadb-10.2/mariadb-10.2/work/build/sql
 -I/opt/local/include  -pipe -Os -stdlib=libc++ -fstack-protector --param
 =ssp-buffer-size=4 -fno-rtti -DNDEBUG -D_FORTIFY_SOURCE=2 -DDBUG_OFF -arch
 x86_64 -mmacosx-version-min=10.7   -I/opt/local/include
 -fvisibility=hidden -o CMakeFiles/perfschema.dir/cursor_by_account.cc.o -c
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_databases_mariadb-10.2/mariadb-10.2/work/server-10.2/storage/perfschema/cursor_by_account.cc
 :info:build In file included from
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_databases_mariadb-10.2/mariadb-10.2/work/server-10.2/storage/perfschema/cursor_by_account.cc:21:
 :info:build In file included from
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_databases_mariadb-10.2/mariadb-10.2/work/server-10.2/include/my_global.h:328:
 :info:build In file included from
 /opt/local/libexec/llvm-9.0/bin/../include/c++/v1/stdlib.h:100:
 :info:build In file included from
 /opt/local/libexec/llvm-9.0/bin/../include/c++/v1/math.h:337:
 :info:build In file included from
 /opt/local/libexec/llvm-9.0/bin/../include/c++/v1/type_traits:417:
 :info:build In file included from
 /opt/local/libexec/llvm-9.0/bin/../include/c++/v1/cstddef:37:
 :info:build
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_databases_mariadb-10.2/mariadb-10.2/work/server-10.2/version:1:1:
 error: expected unqualified-id
 :info:build MYSQL_VERSION_MAJOR=10
 :info:build ^
 :info:build
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_databases_mariadb-10.2/mariadb-10.2/work/build/include/my_config.h:549:29:
 note: expanded from macro 'MYSQL_VERSION_MAJOR'
 :info:build #define MYSQL_VERSION_MAJOR 10
 :info:build                             ^
 }}}

 It looks like clang-9.0 has some preliminary C++20 support, including the
 addition of a <version> header, and its <cstddef> is trying to include it,
 but finds the file of the same name in the mariadb source instead.

-- 
Ticket URL: <https://trac.macports.org/ticket/59575#comment:1>
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