From 87c75125b44542c28e5e1a00f9eb0f9e3ee21f66 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rainer=20M=C3=BCller?= <raimue@macports.org>
Date: Tue, 27 Mar 2018 04:25:42 +0200
Subject: [PATCH] rust: Downgrade to llvm-4.0

The update to 1.24.0 in 4b2c24ca erroneously switched to LLVM 5.0, which
is still not supported by this rust version. Compiling with rustc will
produce "invalid expression" messages.

See: https://github.com/rust-lang/rust/issues/43370
See: https://github.com/rust-lang/rust/issues/47464
---
 lang/rust/Portfile | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/lang/rust/Portfile b/lang/rust/Portfile
index a3f198db3c6f6..1cb0bf1203c84 100644
--- a/lang/rust/Portfile
+++ b/lang/rust/Portfile
@@ -5,7 +5,7 @@ PortGroup           muniversal 1.0
 
 name                rust
 version             1.24.1
-revision            1
+revision            2
 categories          lang devel
 platforms           darwin
 supported_archs     i386 x86_64
@@ -29,7 +29,9 @@ homepage            https://www.rust-lang.org/
 depends_build       path:bin/cmake:cmake \
                     bin:python2.7:python27
 
-depends_lib         port:llvm-5.0
+# Currently LLVM 4.0 is required, see this issue for LLVM 5.0 support:
+# https://github.com/rust-lang/rust/issues/43370 .
+depends_lib         port:llvm-4.0
 
 master_sites        https://static.rust-lang.org/dist
 
@@ -119,7 +121,7 @@ configure.args      --enable-vendor \
                     --default-linker=${configure.cc} \
                     --disable-codegen-tests \
                     --disable-docs \
-                    --llvm-root=${prefix}/libexec/llvm-5.0 \
+                    --llvm-root=${prefix}/libexec/llvm-4.0 \
                     --release-channel=stable
 
 if {![variant_isset universal]} {