Autodiff Upstreaming - rustc_codegen_llvm changes

.github/ISSUE_TEMPLATE/tracking_issue.md

@@ -46,7 +46,7 @@ for larger features an implementation could be broken up into multiple PRs.
 
 [stabilization-guide]: https://rustc-dev-guide.rust-lang.org/stabilization_guide.html#stabilization-pr
 [doc-guide]: https://rustc-dev-guide.rust-lang.org/stabilization_guide.html#documentation-prs
-[nightly-style-procedure]: https://github.com/rust-lang/style-team/blob/master/nightly-style-procedure.md 
+[nightly-style-procedure]: https://github.com/rust-lang/style-team/blob/main/nightly-style-procedure.md 
 [Style Guide]: https://github.com/rust-lang/rust/tree/master/src/doc/style-guide
 
 ### Unresolved Questions

.github/renovate.json5

@@ -0,0 +1,14 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  // Let Renovatebot keep an opened issue that tracks our dependencies
+  "dependencyDashboard": true,
+  // Disable "normal" package updates
+  "enabledManagers": [],
+  // Update lockfiles once per week
+  "lockFileMaintenance": {
+    "enabled": true,
+    "schedule": [
+      "before 5am on Tuesday"
+    ]
+  }
+}

.github/workflows/ci.yml

@@ -46,7 +46,7 @@ jobs:
   # If you want to modify CI jobs, take a look at src/ci/github-actions/jobs.yml.
   calculate_matrix:
     name: Calculate job matrix
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     outputs:
       jobs: ${{ steps.jobs.outputs.jobs }}
       run_type: ${{ steps.jobs.outputs.run_type }}
@@ -65,7 +65,7 @@ jobs:
     defaults:
       run:
         shell: ${{ contains(matrix.os, 'windows') && 'msys2 {0}' || 'bash' }}
-    timeout-minutes: 240
+    timeout-minutes: 360
     env:
       CI_JOB_NAME: ${{ matrix.image }}
       CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
@@ -110,11 +110,7 @@ jobs:
       # less disk space.
       - name: free up disk space
         uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be
-        if: contains(matrix.os, 'ubuntu')
-        with:
-          # Removing packages with APT saves ~5 GiB, but takes several
-          # minutes (and potentially removes important packages).
-          large-packages: false
+        if: matrix.free_disk
 
       # Rust Log Analyzer can't currently detect the PR number of a GitHub
       # Actions build on its own, so a hint in the log message is needed to
@@ -239,14 +235,15 @@ jobs:
           DATADOG_API_KEY: ${{ secrets.DATADOG_API_KEY }}
           DD_GITHUB_JOB_NAME: ${{ matrix.name }}
         run: |
-          npm install -g @datadog/datadog-ci@^2.x.x
-          python3 src/ci/scripts/upload-build-metrics.py build/cpu-usage.csv
+          cd src/ci
+          npm ci
+          python3 scripts/upload-build-metrics.py ../../build/cpu-usage.csv
 
   # This job isused to tell bors the final status of the build, as there is no practical way to detect
   # when a workflow is successful listening to webhooks only in our current bors implementation (homu).
   outcome:
     name: bors build finished
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     needs: [ calculate_matrix, job ]
     # !cancelled() executes the job regardless of whether the previous jobs passed or failed
     if: ${{ !cancelled() && contains(fromJSON('["auto", "try"]'), needs.calculate_matrix.outputs.run_type) }}

.github/workflows/dependencies.yml

@@ -27,7 +27,7 @@ jobs:
   not-waiting-on-bors:
     if: github.repository_owner == 'rust-lang'
     name: skip if S-waiting-on-bors
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -47,7 +47,7 @@ jobs:
     if: github.repository_owner == 'rust-lang'
     name: update dependencies
     needs: not-waiting-on-bors
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: checkout the source code
         uses: actions/checkout@v4
@@ -94,7 +94,7 @@ jobs:
     if: github.repository_owner == 'rust-lang'
     name: amend PR
     needs: update
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     permissions:
       contents: write
       pull-requests: write

.gitignore

@@ -46,8 +46,7 @@ no_llvm_build
 /inst/
 /llvm/
 /mingw-build/
-build/
-!/compiler/rustc_mir_build/src/build/
+/build
 /build-rust-analyzer/
 /dist/
 /unicode-downloads
@@ -89,12 +88,12 @@ package.json
 tests/rustdoc-gui/src/**.lock
 
 ## direnv
-.envrc
-.direnv/
+/.envrc
+/.direnv/
 
 ## nix
-flake.nix
+/flake.nix
 flake.lock
-default.nix
+/default.nix
 
 # Before adding new lines, see the comment at the top.

.gitmodules

@@ -33,7 +33,7 @@
 [submodule "src/llvm-project"]
 	path = src/llvm-project
 	url = https://github.com/rust-lang/llvm-project.git
-	branch = rustc/19.1-2024-09-17
+	branch = rustc/19.1-2024-12-03
 	shallow = true
 [submodule "src/doc/embedded-book"]
 	path = src/doc/embedded-book