[MacPorts] #65550: julia: link fails for 10.14 and earlier: ld: unsupported tapi file type '!tapi-tbd' in YAML file

[MacPorts]

#65550: julia: link fails for 10.14 and earlier: ld: unsupported tapi file type
'!tapi-tbd' in YAML file
------------------------+-----------------------
  Reporter:  githubbjs  |      Owner:  essandess
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.7.2
Resolution:             |   Keywords:
      Port:  julia      |
------------------------+-----------------------

Comment (by quentinmit):

 I was able to get julia to build on Mojave with a simple Makefile patch; I
 replaced


 {{{
 OSLIBS += $(SRCDIR)/mach_dyld_atfork.tbd
 }}}

 with


 {{{
 CLANG_LDFLAGS += -Wl,-U,__dyld_atfork_prepare -Wl,-U,__dyld_atfork_parent
 }}}


 and added `$(CLANG_LDFLAGS)` to the rules building libjulia-internal and
 libjulia-internal-debug. The latter is probably safe on every platform but
 the former needs a guard for older OS versions, of course.

 It's possible that the additional `-U` flags are unnecessary, but I didn't
 test that (the previous line sets a different flag that theoretically
 should allow unknown symbols as well).

-- 
Ticket URL: <https://trac.macports.org/ticket/65550#comment:16>
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