[MacPorts] #57573: arm-none-eabi-gcc: broken build on 10.13 / Xcode 10 (isl issue)

[MacPorts]

#57573: arm-none-eabi-gcc: broken build on 10.13 / Xcode 10 (isl issue)
--------------------+-------------------------------
 Reporter:  mojca   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  arm-none-eabi-gcc
--------------------+-------------------------------
 I had arm-none-eabi-gcc installed from the buildbot, but when I tried to
 build it from source, I was stuck with a build error.

 {{{
 :info:build clang: error: unsupported option '-print-multi-os-directory'
 :info:build clang: error: no input files
 ...
 :info:build /path/to/arm-none-eabi-gcc/work/gcc-7.3.0/gcc/graphite-
 dependences.c:48:16: error: use of undeclared identifier
 'isl_space_get_tuple_id'; did you mean 'isl_map_get_tuple_id'?
 :info:build   isl_id *id = isl_space_get_tuple_id (d, isl_dim_in);
 :info:build                ^~~~~~~~~~~~~~~~~~~~~~
 :info:build                isl_map_get_tuple_id
 }}}
 See:
 * https://github.com/osx-cross/homebrew-
 avr/commit/ef705e991484b05742037a7ec2137fd346fb2fd4
 * https://github.com/osx-cross/homebrew-
 avr/commit/9880124718b22b04b7049e149a0fc8f25905fffa

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Ticket URL: <https://trac.macports.org/ticket/57573>
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