[MacPorts] #70675: gh: Error: Failed to destroot gh: dyld: Symbol not found: _exit

[MacPorts]

#70675: gh:  Error: Failed to destroot gh: dyld: Symbol not found: _exit
--------------------------------+-------------------------------
  Reporter:  RobK88             |      Owner:  (none)
      Type:  defect             |     Status:  new
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:  2.10.1
Resolution:                     |   Keywords:  elcapitan mtnlion
      Port:  gh legacy-support  |
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Comment (by fhgwright):

 AIUI, `go` is self-hosted, meaning that a working version of `go` is
 needed to build `go`, hence the current approach.  "Just fix the source"
 isn't an option until ''after'' one has a working binary.  The only
 version requirement for the bootstrap binary is that it be sufficiently
 recent to support the build procedure, and moving to a "much newer
 version" is exactly the wrong thing, because it's likely to make the OS
 requirements worse.

 There are actually several problems with `gh` as it stands, aside from the
 issue here:

 1) It also needs `utimensat()`, which didn't appear until 10.13.  That one
 is trivially fixed by changing the version threshold for the `legacy-
 support` patch.  In fact, it means that `legacy-support` is needed for all
 binary versions, so the extra conditional goes away.

 2) In addition to the aforementioned #67520, #66749 is also relevant.

 3) The binary doesn't include `i386` or `ppc` slices.

 4) The binary uses a load command that's unsupported on 10.5 (and
 presumably 10.4, if it got past the architecture issue).

 5) The builds from source on 10.13 and 10.14 don't work, due to some
 quoting issue with command arguments.

 The bottom line is that `gh` doesn't currently work on anything older than
 10.15, even with the easy fixes.

-- 
Ticket URL: <https://trac.macports.org/ticket/70675#comment:7>
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