[DO NOT MERGE] start building Enzyme in CI

src/ci/docker/host-aarch64/dist-aarch64-linux/Dockerfile

@@ -89,6 +89,7 @@ ENV RUST_CONFIGURE_ARGS \
       --set llvm.thin-lto=true \
       --set llvm.libzstd=true \
       --set llvm.ninja=false \
+      --set llvm.enzyme=true \
       --set rust.debug-assertions=false \
       --set rust.jemalloc \
       --set rust.use-lld=true \

src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile

@@ -90,6 +90,7 @@ ENV RUST_CONFIGURE_ARGS \
       --set target.x86_64-unknown-linux-gnu.ranlib=/rustroot/bin/llvm-ranlib \
       --set llvm.thin-lto=true \
       --set llvm.ninja=false \
+      --set llvm.enzyme=true \
       --set llvm.libzstd=true \
       --set rust.jemalloc \
       --set rust.use-lld=true \

src/ci/docker/host-x86_64/x86_64-gnu/Dockerfile

@@ -30,4 +30,5 @@ ENV RUST_CONFIGURE_ARGS \
  --enable-profiler \
  --enable-compiler-docs \
  --set llvm.libzstd=true
+ --set llvm.enzyme=true \
 ENV SCRIPT python3 ../x.py --stage 2 test

src/ci/github-actions/jobs.yml

@@ -369,7 +369,7 @@ auto:
   - name: dist-x86_64-apple
     env:
       SCRIPT: ./x.py dist bootstrap --include-default-paths --host=x86_64-apple-darwin --target=x86_64-apple-darwin
-      RUST_CONFIGURE_ARGS: --enable-full-tools --enable-sanitizers --enable-profiler --set rust.jemalloc --set rust.lto=thin --set rust.codegen-units=1
+      RUST_CONFIGURE_ARGS: --enable-full-tools --enable-sanitizers --enable-profiler --set llvm.enzyme=true --set rust.jemalloc --set rust.lto=thin --set rust.codegen-units=1
       RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
       # Ensure that host tooling is built to support our minimum support macOS version.
       MACOSX_DEPLOYMENT_TARGET: 10.12
@@ -387,7 +387,7 @@ auto:
       SCRIPT: ./x.py dist bootstrap --include-default-paths --host='' --target=aarch64-apple-ios,x86_64-apple-ios,aarch64-apple-ios-sim,aarch64-apple-ios-macabi,x86_64-apple-ios-macabi
       # Mac Catalyst cannot currently compile the sanitizer:
       # https://github.com/rust-lang/rust/issues/129069
-      RUST_CONFIGURE_ARGS: --enable-sanitizers --enable-profiler --set rust.jemalloc --set target.aarch64-apple-ios-macabi.sanitizers=false --set target.x86_64-apple-ios-macabi.sanitizers=false
+      RUST_CONFIGURE_ARGS: --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.enzyme=true --set target.aarch64-apple-ios-macabi.sanitizers=false --set target.x86_64-apple-ios-macabi.sanitizers=false
       RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
       # Ensure that host tooling is built to support our minimum support macOS version.
       # FIXME(madsmtm): This might be redundant, as we're not building host tooling here (?)
@@ -419,6 +419,7 @@ auto:
         --enable-profiler
         --set rust.jemalloc
         --set llvm.ninja=false
+        --set llvm.enzyme=true
         --set rust.lto=thin
         --set rust.codegen-units=1
       RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
@@ -601,6 +602,7 @@ auto:
       SCRIPT: python x.py dist bootstrap --include-default-paths
       RUST_CONFIGURE_ARGS: >-
         --build=x86_64-pc-windows-gnu
+        --set llvm.enzyme=true
         --enable-full-tools
       DIST_REQUIRE_ALL_TOOLS: 1
       CODEGEN_BACKENDS: llvm,cranelift