[MacPorts] #71729: port deps misdetects dependencies on Rosetta

[MacPorts]

#71729: port deps misdetects dependencies on Rosetta
---------------------------+--------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  base          |    Version:  2.10.5
Resolution:                |   Keywords:
      Port:                |
---------------------------+--------------------

Comment (by ryandesign):

 Looking at the PortIndex files on the server, I see that the darwin 10
 i386 index is the only one that mentions a clang-11 dependency for
 LimeChat. Later and earlier macOS versions do not mention any clang
 dependency. I can also see this locally on a macOS 12 machine:

 {{{
 % port deps LimeChat
 LimeChat @2.47_1 has no dependencies.
 }}}
 {{{
 % port deps LimeChat os.major=11
 LimeChat @2.47_1 has no dependencies.
 }}}
 {{{
 % port deps LimeChat os.major=10
 Full Name: LimeChat @2.26_1
 Build Dependencies:   clang-11
 Library Dependencies: libcxx
 }}}
 {{{
 % port deps LimeChat os.major=9 configure.cxx_stdlib=libstdc++
 LimeChat @2.26_1 has no dependencies.
 }}}

 The reason seems to be that MacPorts uses libc++ on 10.6 and later, and it
 knows that no compiler available via Xcode on 10.6 can use libc++, so it
 does not attempt to use any Xcode compiler and falls back to a MacPorts
 clang compiler:

 https://github.com/macports/macports-
 base/blob/b2dcbb94d1a02cc37cb7041c6df48a5d1e4b3d4b/src/port1.0/portconfigure.tcl#L936-L939

 On 10.5 and earlier, libstdc++ is used, so the Xcode compilers would be
 acceptable.

 So, as far as I can tell, this is all working as designed.

-- 
Ticket URL: <https://trac.macports.org/ticket/71729#comment:1>
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