[MacPorts] #64920: Allow universal variant for llvm-5.0

[MacPorts]

#64920: Allow universal variant for llvm-5.0
-------------------------------------+----------------------
 Reporter:  barracuda156             |      Owner:  (none)
     Type:  enhancement              |     Status:  new
 Priority:  Normal                   |  Milestone:
Component:  ports                    |    Version:  2.7.2
 Keywords:  powerpc, leopard, ppc64  |       Port:  llvm-5.0
-------------------------------------+----------------------
 For an unclear reason, `llvm-5.0` lacks universal variant, and
 subsequently `+universal` is simply ignored, it gets built for a single
 arch.
 However it does build as `+universal` once `muniversal 1.0` PortGroup is
 added and variant description is borrowed from earlier llvm:

 {{{
 platform darwin {
     supported_archs ppc ppc64 i386 x86_64
 }

 variant universal {
     build.env-append \
         UNIVERSAL=1 \
         UNIVERSAL_ARCH=[get_canonical_archs]
     destroot.env-append \
         UNIVERSAL=1 \
         UNIVERSAL_ARCH=[get_canonical_archs]

     post-extract {
         # workaround a bug in Apple's shipped gcc driver-driver, patched
 in
         # ours with driverdriver-num_infiles.patch
         if {${configure.compiler} eq "gcc-4.0" ||
             ${configure.compiler} eq "gcc-4.2" ||
             ${configure.compiler} eq "llvm-gcc-4.2"} {
             system "echo \"static int ___ignoreme;\" >
 ${worksrcpath}/tools/llvm-shlib/ignore.c"
         }
     }
 }
 }}}

 Then I built it with `macports-gcc-7`:

 {{{
 36-109:~ svacchanda$ port -v installed llvm-5.0
 The following ports are currently installed:
   llvm-5.0 @5.0.2_3 requested_variants='' platform='darwin 9'
 archs='ppc64' date='2022-04-01T05:40:26+0800'
   llvm-5.0 @5.0.2_3+universal (active) requested_variants='+universal'
 platform='darwin 9' archs='ppc ppc64' date='2022-04-01T08:52:50+0800'
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/64920>
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