[MacPorts] #64950: libgcc-devel @12-20220327_0+enable_stdlib_flag+universal: configure: error: C preprocessor "/lib/cpp" fails sanity check

[MacPorts]

#64950: libgcc-devel @12-20220327_0+enable_stdlib_flag+universal: configure: error:
C preprocessor "/lib/cpp" fails sanity check
---------------------------+--------------------
  Reporter:  aliktab       |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.2
Resolution:                |   Keywords:
      Port:  libgcc-devel  |
---------------------------+--------------------

Comment (by ryandesign):

 Ok, so the reason why it fell back on /lib/cpp (which doesn't exist on
 macOS) is that all of the other things it tried failed because of the
 universal variant:

 {{{
 configure:4115: checking how to run the C preprocessor
 configure:4146: /usr/bin/clang -arch arm64 -arch x86_64 -E
 -I/opt/local/include
 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk conftest.c
 clang: error: cannot use 'cpp-output' output with multiple -arch options
 }}}

 Obviously, if you don't need the +universal variant, don't use it; you'll
 avoid this problem.

 If you do need it, then we'll need to figure out how to fix it. Modifying
 the port to use the muniversal portgroup is a possible solution.
 Investigating whether the other gcc ports have the same problem, and if
 not whether they are already using some fix for it, would be a good idea,
 so that we can use the same fix here.

-- 
Ticket URL: <https://trac.macports.org/ticket/64950#comment:3>
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