chore: Build for x86_64-unknown-linux-musl with all features and optimized binary size (#689)

Signed-off-by: Alexander Rodin <[email protected]>

Author: a-rodin

.circleci/config.yml

@@ -183,7 +183,8 @@ jobs:
           name: Build archive
           command: |
             export VERSION=$(make version)
-            make build-archive FEATURES="jemallocator"
+            export RUST_LTO="lto"
+            make build-archive FEATURES="jemallocator leveldb rdkafka rdkafka/cmake_build"
       - persist_to_workspace:
           root: target/artifacts
           paths:

scripts/build-archive.sh

@@ -10,10 +10,12 @@
 #
 #   $FEATURES - a list of Vector features to include when building, defaults to all
 #   $NATIVE_BUILD - whether to pass the --target flag when building via cargo
+#   $RUST_LTO - possible values are "lto", "lto=thin", ""
 #   $TARGET - a target triple. ex: x86_64-apple-darwin
 #   $VERSION - the version of Vector, can be obtained via `make version`
 
 NATIVE_BUILD=${NATIVE_BUILD:-}
+RUST_LTO=${RUST_LTO:-}
 
 set -eu
 
@@ -46,8 +48,26 @@ if [ "$FEATURES" != "default" ]; then
   build_flags="$build_flags --no-default-features --features $FEATURES"
 fi
 
+# Currently the only way to set Rust codegen LTO type (-C lto, as opposed to
+# -C compiler-plugin-lto) at build time for a crate with library dependencies
+# is to patch Cargo.toml before the build. See
+# https://github.com/rust-lang/cargo/issues/4349 and
+# https://bugzilla.mozilla.org/show_bug.cgi?id=1386371#c2.
+if [ -n "$RUST_LTO" ]; then
+  cp Cargo.toml Cargo.toml.orig
+  trap "mv Cargo.toml.orig Cargo.toml" EXIT
+  case "$RUST_LTO" in
+    lto) lto_value="true";;
+    lto=thin) lto_value="\"thin\"";;
+  esac
+  printf "[profile.release]\nlto = $lto_value" >> Cargo.toml
+fi
+
 cargo build $build_flags
 
+# Strip the output binary
+strip $target_dir/release/vector
+
 # Build the archive directory
 rm -rf $archive_dir
 mkdir -p $archive_dir