Version 1.60.0 release

Author: danielhenrymantilla

config.sh

@@ -5,25 +5,34 @@
 
 set -euxo pipefail
 
-RUST_TOOLCHAIN="1.57.0"
-
-LLVM_BRANCH="swift-5.3.2-RELEASE"
+RUST_TOOLCHAIN="1.60.0"
+
+# Note(Daniel): the official tagged releases of that llvm fork are currently
+# lagging too much behind the official `llvm`, which makes them incompatible
+# with the LLVM API required to compile the Rust toolchain, at least as of 1.60.
+# So neither swift-5.6.1-RELEASE nor swift-5.7-DEVELOPMENT-SNAPSHOT-2022-04-12-a
+#
+# But the tip of `apple/llvm-project`'s is too advanced as well, so I've had
+# to find a "sweet spot" in between both. I guess a decent approach could be
+# to start at https://github.com/rust-lang/rust/blob/1.60.0/.gitmodules#L37, and
+# to find a commit in `apple/llvm-project` close to it (ideally containing it)
+LLVM_BRANCH=bda51ce411586a8c012623300d8598ce84fced53
 
 get_rust_commit_for_toolchain() (
     # Yields "" for a toolchain like `x.y.z`, and `mm-dd-yy` for `nightly-mm-dd-yy`
     IF_NIGHTLY_DATE_STRIPPED=$(echo "${RUST_TOOLCHAIN}" | sed -n 's/^nightly-//p')
-    if [ -n "${IF_NIGHTLY_DATE_STRIPPED}" ]; then
+    if [ -n "${IF_NIGHTLY_DATE_STRIPPED}" ]; then # `if let Some(nightly_date)`
         curl "https://static.rust-lang.org/dist/${IF_NIGHTLY_DATE_STRIPPED}/channel-rust-nightly-git-commit-hash.txt"
     else
         echo "refs/tags/${RUST_TOOLCHAIN}"
     fi
 )
 
 # 2. Select the best branch, tag or commit hash from https://github.com/rust-lang/rust
-
+# Thanks to `get_rust_commit_for_toolchain` helper, this should no longer need
+# to be manually done.
 RUST_BRANCH="$(get_rust_commit_for_toolchain)"
 
 # 3. Select a name for the toolchain you want to install as. The toolchain will be installed
 # under $HOME/.rustup/toolchains/rust-$RUST_TOOLCHAIN
-
 RUST_TOOLCHAIN="ios-arm64-${RUST_TOOLCHAIN}"