[MacPorts] #73957: rust @1.95.0: error: use of overloaded operator '!=' is ambiguous

[MacPorts]

#73957: rust @1.95.0: error: use of overloaded operator '!=' is ambiguous
----------------------+---------------------------------
  Reporter:  mrkapqa  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.12.5
Resolution:           |   Keywords:  mojave catalina
      Port:  rust     |
----------------------+---------------------------------

Comment (by herbygillot):

 In [changeset:"e454763820ea5bd5b3cdf9cacd9f25589af56964/macports-ports"
 e454763820ea5bd5b3cdf9cacd9f25589af56964/macports-ports] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="e454763820ea5bd5b3cdf9cacd9f25589af56964"
 rust_build PG: build bundled LLVM with a new enough clang

 lang/rust and lang/rust-bootstrap compile the LLVM bundled in the Rust
 source
 tree, but the rust PortGroup only asks for `compiler.cxx_standard 2017`,
 whose
 Apple clang minimum in base is 1000.11.45.2.  That admits Apple clang 11
 and
 12 -- too old for LLVM 21 -- on exactly the two macOS versions whose
 newest
 Apple clang falls in the gap between that bound and the `{clang < 1204}`
 that
 lang/llvm-NN already enforces for the same sources.

 On macOS 10.14.6 with Apple clang 11.0.0 (clang-1100.0.33.17), building
 rust
 1.97.1 fails in AMDGPU/SIInstrInfo.cpp with "use of overloaded operator
 '!='
 is ambiguous": that clang mis-ranks the integral promotion of a TableGen
 `enum : uint16_t` against llvm::Register's operator!= overload set.
 Verified
 on a clean 10.14.6 host -- unpatched the build dies at SIInstrInfo.cpp.o,
 and
 with this blacklist it selects MacPorts Clang 17 and completes, exit 0.

 Also verified on 10.15.7 that the PortGroup placement takes effect: the
 port
 now chooses macports-clang-17 where it previously chose Xcode Clang.

 Note that Apple clang 12 was measured to build 1.97.1 successfully, so the
 empirically-required bound is `< 1200`; 1204 is used for parity with
 lang/llvm-NN.

 See: https://trac.macports.org/ticket/73957

 Assisted-by: Claude:claude-opus-5
 Co-Authored-By: Claude Opus 5 <noreply at anthropic.com>
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/73957#comment:9>
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