Merge pull request #5272 from cloudflare/felix/092925-build-maintenance

10-08-25 build maintenance

Author: danlapid

.bazelrc

@@ -90,11 +90,6 @@ build:windows --per_file_copt=external/simdutf@/clang:-fno-exceptions
 build:unix --per_file_copt=external/v8/src/torque@-fexceptions
 build:windows --per_file_copt=external/v8/src/torque@/clang:-fexceptions
 
-# Disable relaxing all jumps during LLVM codegen under -O0, which previously led to build
-# performance improvements but makes code size worse. This will be the default in LLVM19.
-# https://maskray.me/blog/2024-04-27-clang-o0-output-branch-displacement-and-size-increase
-build:unix --copt="-mno-relax-all" --host_copt="-mno-relax-all"
-
 # Limit transitive header includes within libc++. This improves compliance with IWYU, helps avoid
 # errors with downstream projects that implicitly define this already and reduces total include size.
 https://libcxx.llvm.org/DesignDocs/HeaderRemovalPolicy.html

.github/actions/setup-runner/action.yml

@@ -38,12 +38,6 @@ runs:
         git config --show-scope --show-origin core.symlinks
         git config --system core.longpaths true
         [System.IO.File]::WriteAllLines((Join-Path -Path $env:USERPROFILE -ChildPath '.bazelrc'), 'startup --output_user_root=\\\\?\\C:\\tmp')
-    - name: Setup macOS
-      if: runner.os == 'macOS'
-      shell: bash
-      run: |
-        # Build using Xcode 16.3 (equivalent to Clang 19)
-        sudo xcode-select -s "/Applications/Xcode_16.3.app"
     - name: Configure git hooks
       shell: bash
       # Configure git to quell an irrelevant warning for runners (they never commit / push).

.github/workflows/_bazel.yml

@@ -113,7 +113,7 @@ jobs:
         # support. Since we still need symlinks to compile C++ code properly, compile these targets
         # separately.
         run: |
-          bazel --nowindows_enable_symlinks build ${{ inputs.extra_bazel_args }} --config=ci --remote_cache=https://bazel:${{ secrets.BAZEL_CACHE_KEY }}@bazel-remote-cache.devprod.cloudflare.dev //src/wpt:wpt-all@tsproject //src/node:node@tsproject //src/pyodide:pyodide_static@tsproject
+          bazel --nowindows_enable_symlinks build ${{ inputs.extra_bazel_args }} --config=ci --profile build-win-workaround.bazel-profile.gz --remote_cache=https://bazel:${{ secrets.BAZEL_CACHE_KEY }}@bazel-remote-cache.devprod.cloudflare.dev //src/wpt:wpt-all@tsproject //src/node:node@tsproject //src/pyodide:pyodide_static@tsproject
       - name: Bazel build
         # timestamps are no longer being added here, the GitHub logs include timestamps (Use
         # 'Show timestamps' on the web interface)
@@ -158,6 +158,12 @@ jobs:
           name: ${{ inputs.os_name }}-${{ inputs.arch_name }}${{ inputs.suffix }}-binary
           path: bazel-bin/src/workerd/server/workerd${{ runner.os == 'Windows' && '.exe' || '' }}
           if-no-files-found: error
+      - name: Upload build statistics
+        if: inputs.run_tests
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ inputs.os_name }}${{ inputs.arch_name }}${{ inputs.suffix }}-bazel-profile
+          path: '*.bazel-profile.gz'
 
       - name: Drop large Bazel cache files
         if: always()

.github/workflows/release.yml

@@ -86,17 +86,17 @@ jobs:
             bazel-config: release_linux
             target-arch: ARM64
           # Based on runner availability, we build both Apple Silicon and (cross-compiled) x86
-          # release binaries on the macos-15 runner.
+          # release binaries on the macos-26 runner.
           - title: macOS-x64
             os-name: macOS
-            # This configuration is used for cross-compiling – macos-15 is Apple Silicon-based but
+            # This configuration is used for cross-compiling – macos-26 is Apple Silicon-based but
             # we use it to compile the x64 release.
-            image: macos-15
+            image: macos-26
             bazel-config: release_macos_cross_x86_64
             target-arch: X64
           - title: macOS-arm64
             os-name: macOS
-            image: macos-15
+            image: macos-26
             bazel-config: release_macos
             target-arch: ARM64
           - title: windows

.github/workflows/test.yml

@@ -35,7 +35,7 @@ jobs:
           [
             { name: linux, arch: X64, image: ubuntu-22.04 },
             { name: linux-arm, arch: ARM64, image: ubuntu-22.04-arm },
-            { name: macOS, arch: ARM64, image: macos-15 },
+            { name: macOS, arch: ARM64, image: macos-26 },
             { name: windows, arch: X64, image: windows-2025 },
           ]
         config: [
@@ -60,7 +60,7 @@ jobs:
           # due to resource constraints, exclude the macOS and x64 Linux debug runners for now.
           # linux-asan and arm64 linux-debug should provide sufficient coverage for building in the
           # debug configuration.
-          - os: { name: macOS, arch: ARM64 ,image: macos-15 }
+          - os: { name: macOS, arch: ARM64, image: macos-26 }
             config: { suffix: -debug }
           - os: { name: linux, arch: X64, image: ubuntu-22.04 }
             config: { suffix: -debug }

Dockerfile.release

@@ -1,4 +1,4 @@
-FROM node:bullseye AS builder
+FROM node:trixie AS builder
 
 WORKDIR /workerd
 

build/ci.bazelrc

@@ -23,6 +23,9 @@ build:ci --color=yes
 # Indicate support for more terminal columns, 100 is the line length recommended by KJ style.
 build:ci --terminal_columns=100
 
+# Emit build profile so that slow builds can be investigated
+build:ci --profile build.bazel-profile.gz
+test:ci --profile test.bazel-profile.gz
 test:ci --test_output=errors --test_summary=terse
 build:ci --disk_cache=~/bazel-disk-cache