[MacPorts] #62848: redis @6.2.3: Undefined symbols ___atomic_compare_exchange_8 ___atomic_fetch_add_8 ___atomic_load_8

[MacPorts]

#62848: redis @6.2.3: Undefined symbols ___atomic_compare_exchange_8
___atomic_fetch_add_8 ___atomic_load_8
-------------------------+------------------------------
  Reporter:  ryandesign  |      Owner:  dgilman
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.4
Resolution:  fixed       |   Keywords:  snowleopard i386
      Port:  redis       |
-------------------------+------------------------------

Comment (by kencu):

 So the way to fix this libatomic thing is:

 use a clang that has i386 atomics enabled (see above. clang used to
 default to having atomics enabled in clang_rt, then the default changed we
 had to specifically enable it again .. I think I fixed all or nearly all
 of them).

 or, only when building with gcc (or more specifically, when building
 against libgcc, which contains libatomic), add -latomic to the linker
 flags.

 It is indeed some spaghetti to cover off all these permutations. Quite a
 few configure scripts will test to see if adding libatomic is required to
 support atomics.

 For those that don't, in practical terms, what we usually do is something
 like this pseudo-code:

 {{{
 if {test for compiler being gcc} {
   configure.ldflags-append -latomic
 }
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/62848#comment:5>
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