Rust 1.44.0.0 won't compile on macOS Sierra 10.12.6 and Trac, ticket # 56351

[Greg Earle]

On 25 Jun 2020, at 5:00, macports-users-request at lists.macports.org 
wrote:

> I did a "port upgrade outdated" and it looks like "librsvg" has a
> dependency on Cairo which in turn pulls in Rust.  (I didn't have Rust
> installed previously.)

Thanks to auto-correct for changing "Cargo" into "Cairo" underneath my 
fingers.

Update:

> Is the only (other) workaround to de-activate llvm-9.0 +universal?
>
> --
> # port installed | grep llvm-
>    llvm-3.3 @3.3_10 (active)
>    llvm-6.0 @6.0.1_1 (active)
>    llvm-7.0 @7.1.0_0 (active)
>    llvm-8.0 @8.0.1_0 (active)
>    llvm-9.0 @9.0.1_0+universal (active)
> --

In the interests of expediency (and impatience), I did just that:

--
# port install llvm-9.0 -universal
--->  Computing dependencies for llvm-9.0
--->  Fetching archive for llvm-9.0
--->  Attempting to fetch llvm-9.0-9.0.1_0.darwin_16.x86_64.tbz2 from 
https://packages.macports.org/llvm-9.0
--->  Attempting to fetch llvm-9.0-9.0.1_0.darwin_16.x86_64.tbz2.rmd160 
from https://packages.macports.org/llvm-9.0
--->  Installing llvm-9.0 @9.0.1_0
--->  Deactivating llvm-9.0 @9.0.1_0+universal
--->  Cleaning llvm-9.0
--->  Activating llvm-9.0 @9.0.1_0
--->  Cleaning llvm-9.0
--->  Scanning binaries for linking errors
--->  No broken files found.
--->  No broken ports found.
--

and now Rust builds and installs, but not without this final complaint:

--
--->  Building rust
--->  Staging rust into destroot
Warning: violation by /private
Warning: rust violates the layout of the ports-filesystems!
Warning: Please fix or indicate this misbehavior (if it is intended), it 
will be an error in future releases!
--

I've put back the +universal variant of llvm until the next time I hit 
this.

But it would be nice if Rust would build with llvm +universal (hint, 
hint).

		- Greg