[MacPorts] #66250: xz fails to build with libunwind active

[MacPorts]

#66250: xz fails to build with libunwind active
---------------------------+--------------------
  Reporter:  opencoff      |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.0
Resolution:                |   Keywords:
      Port:  libunwind xz  |
---------------------------+--------------------

Comment (by nilason):

 I first experienced a crash of MacPort's and System's libunwind as
 reported with #68250.

 It seems to me Xcode 15 brought changes that are causing this. With the
 {{{libunwind}}} port installed, building against libc++ the linker hooks
 up **any** binary to MacPorts' dylib making opportunistic linking for
 basically all C++ based ports. Something that will also cause crash in
 case of thrown exception. This was not the case pre-Xcode 15.

 I tend to agree with Ken, to **not** install the port {{{libunwind}}} on
 10.7+ (even though it is included in the system since 10.6:
 https://github.com/llvm/llvm-
 project/blob/main/libunwind/include/libunwind.h).
 I also believe this is quite an urgent matter, as most problems will
 likely appear only in runtime, for potentially any C++ based ports.

-- 
Ticket URL: <https://trac.macports.org/ticket/66250#comment:5>
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