[MacPorts] #63778: gcc10: Error: configuring for an unreleased macOS version x86_64-apple-darwin21

[MacPorts]

#63778: gcc10: Error: configuring for an unreleased macOS version x86_64-apple-
darwin21
--------------------------+----------------------
  Reporter:  astroboylrx  |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.7.1
Resolution:               |   Keywords:  monterey
      Port:  gcc10        |
--------------------------+----------------------

Comment (by davidvogan):

 This first error "Error: configuring for an unreleased macOS version
 x86_64-apple-darwin21" traces to the file

 gcc-10.3.0/gcc/config.gcc

 Lines 677-719 run through various possibilities for the Mac OS; but they
 stop at Darwin 20. After line 690, there should be an additional case like

 *-*-darwin21*)
         # Darwin 21 corresponds to macOS 12.
         macos_maj=12
         ;;

 When I made this change (probably clumsily or incorrectly), compilation
 proceeded past this first error, but failed on the second:

 :info:build clang: error: linker command failed with exit code 1 (use -v
 to see invocation)
 :info:build make[3]: *** [build/gencondmd] Error 1

 which referred to a long list of undefined symbols

 :info:build Undefined symbols for architecture x86_64:
 :info:build   "_cfun", referenced from:...

 No idea how to address that.

-- 
Ticket URL: <https://trac.macports.org/ticket/63778#comment:3>
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