[MacPorts] #52554: libomp @3.9.0_1 won't build on Snow Leopard, Mac OS X 10.6.8, because of missing llvm-lit?

[MacPorts]

#52554: libomp @3.9.0_1 won't build on Snow Leopard, Mac OS X 10.6.8, because of
missing llvm-lit?
------------------------+--------------------------------
  Reporter:  ballapete  |      Owner:  macports-tickets@…
      Type:  defect     |     Status:  closed
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.3.4
Resolution:  wontfix    |   Keywords:
      Port:  libomp     |
------------------------+--------------------------------

Comment (by barracuda156):

 Replying to [comment:17 kencu]:
 > Wait a sec -- what this block does is : if the user is set to
 `libstdc++`, force the `-stdlib=libc++` flag onto the build line to make
 it build.
 > {{{
 > if {${os.platform} eq "darwin" && ${configure.cxx_stdlib} eq
 "libstdc++"} {
 >               if {${os.major} <= 12} {
 >                   # kmp_alloc.c includes <atomic> but libc++ is not the
 default on these systems
 >                   # see https://trac.macports.org/ticket/52554
 >                   configure.cflags-appends -stdlib=libc++
 >               }
 > }
 > }}}
 >
 > It might build. But I would argue that now we don't know where the heck
 we are. What is linked to what? You're mixing standard libraries, and only
 grief can follow that.
 >
 > A proper fix would appear to be to first make sure the user is set up to
 use libc++, and if so, add the flag if it is still needed (on some builds
 it is) -- not to force the flag when it is not appropriate, just to make
 it build.

 Can’t it be fixed by writing something of this kind?
 https://github.com/classilla/tenfourfox/blob/master/js/src/jit/osxppc
 /AtomicOperations-ppc.h

-- 
Ticket URL: <https://trac.macports.org/ticket/52554#comment:18>
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