Error Building libgcc11 on MacOS Catalina: error: unknown type name 'PTR'

[dbl001 (dbl)]

:info:build struct cgraph_edge;
:info:build ^~~~~~
:info:build class
:info:build In file included from /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc11/libgcc11/work/gcc-11.4.0/gcc/lto-compress.c:28:
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc11/libgcc11/work/gcc-11.4.0/gcc/cgraph.h:1883:3: error: unknown type name 'PTR'
:info:build   PTR GTY ((skip (""))) aux;
:info:build   ^
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc11/libgcc11/work/gcc-11.4.0/gcc/cgraph.h:1782:30: error: cannot initialize object parameter of type 'symtab_node' with an expression of type 'cgraph_node'
:info:build     for (unsigned int i = 0; caller->iterate_reference (i, ref); i++)
:in

[Gandoon (Erik Hedlund)]

I have a feeling that this might be related to #67412 as libgcc12 and gcc12 also fails to build on Catalina.

[Gandoon (Erik Hedlund)]

A potential fix might be what fixed #67412 for me. If you have gdb active, try disabling it and then try building.