[MacPorts] #67420: libgcc12 build from source fails

[MacPorts]

#67420: libgcc12 build from source fails
----------------------+----------------------
 Reporter:  kwolcott  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  libgcc12
----------------------+----------------------
 I really don't know what causes the build from source to fail, but there
 are lots of warnings that look really bad, deprecated mktemp, NULL
 something, PTR something...

 LOTS of these:
 :info:build none required
 :info:build checking for library containing ldexp... warning: unknown
 warning option '-Wshadow=local' [-Wunknown-warni
 ng-option]
 :info:build 1 warning generated.

 LOTS of these:
 :info:build
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs
 _ports_lang_gcc12/libgcc12/work/gcc-12.3.0/libiberty/objalloc.c:153:15:
 error: use of undeclared identifier 'PTR'
 :info:build       return (PTR) (ret + CHUNK_HEADER_SIZE);
 :info:build               ^

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Ticket URL: <https://trac.macports.org/ticket/67420>
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