[MacPorts] #62426: libc++: using a newer libc++ to build software on older macos systems

[MacPorts]

#62426: libc++: using a newer libc++ to build software on older macos systems
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  Reporter:  kencu                   |      Owner:  kencu
      Type:  enhancement             |     Status:  closed
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:
Resolution:  fixed                   |   Keywords:
      Port:  libcxx macports-libcxx  |
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Comment (by RJVB):

 I've been trying to get things to crash, without luck. At some point while
 checking out the benchmarks, I discovered that the reference builds which
 are supposed to be linked against the host/old libc++ (or libstdc++ on
 Linux) were actually linked to both /usr/lib/libc++.dylib and
 /opt/local/lib/libc++.dylib (because MacPorts sets `LIBRARY_PATH`).
 They ran (using the newer version AFAICT).


 ----
 About those benchmarks: irrelevant here but they suggest that libcxx 9
 lost any advantage it may have had over libstdc++ in terms of performance.
 The "algorithms" benchmark collection (of very common operations)
 terminates twice faster with the latter, and one of the vector benchmarks
 runs a whopping 10x faster.

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Ticket URL: <https://trac.macports.org/ticket/62426#comment:63>
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