[MacPorts] #70037: abseil-20240116.2_1: fails to build on macOS 10.14.6/Xcode 11.3.1 due to SDKROOT being set to MacOSX10.14.sdk

[MacPorts]

#70037: abseil-20240116.2_1: fails to build on macOS 10.14.6/Xcode 11.3.1 due to
SDKROOT being set to MacOSX10.14.sdk
-----------------------+--------------------
 Reporter:  jbflanman  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.9.3
 Keywords:  Mojave     |       Port:  abseil
-----------------------+--------------------
 While trying to run 'port upgrade outdated' abseil-20240116.2_1 repeatedly
 fails even after 'port clean abseil' and 'port clean --work abseil'.
 Digging into the main.log I find two errors:

 {{{
 :info:build
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_abseil/abseil/work
 /abseil-cpp-20240116.2/absl/hash/internal/hash.h:602:53: error: 'path' is
 unavailable: introduced in macOS 10.15
 :info:build               std::is_same_v<Path, std::filesystem::path>>>
 :info:build                                                     ^
 :info:build
 /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/filesystem:739:24:
 note: 'path' has been explicitly marked unavailable here
 :info:build class _LIBCPP_TYPE_VIS path {
 :info:build                        ^
 :info:build In file included from
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_abseil/abseil/work
 /abseil-cpp-20240116.2/absl/hash/internal/hash.cc:15:
 :info:build
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_abseil/abseil/work
 /abseil-cpp-20240116.2/absl/hash/internal/hash.h:609:61: error:
 'hash_value' is unavailable: introduced in macOS 10.15
 :info:build   return H::combine(std::move(hash_state),
 std::filesystem::hash_value(path));
 :info:build                                                             ^
 :info:build
 /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/filesystem:1195:8:
 note: 'hash_value' has been explicitly marked unavailable here
 :info:build size_t hash_value(const path& __p) noexcept;
 :info:build        ^
 }}}

 At the begining of the main.log I see this:
 {{{
 :debug:extract CPATH='/opt/local/include'
 :debug:extract DEVELOPER_DIR='/Library/Developer/CommandLineTools'
 :debug:extract LIBRARY_PATH='/opt/local/lib'
 :debug:extract MACOSX_DEPLOYMENT_TARGET='10.14'
 :debug:extract MACPORTS_LEGACY_SUPPORT_DISABLED='1'
 :debug:extract
 SDKROOT='/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk'
 }}}

 I have added export
 SDKROOT='/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk' to my
 .bash_profile and restarted terminal to no effect. I have both 10.14 and
 10.15 SDK's.

 Looks like this version of abseil needs a minimum sdk of 10.15.

-- 
Ticket URL: <https://trac.macports.org/ticket/70037>
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