Fix MacOS CI builds (#2354)

- Use container: ubuntu:20.04 instead of container: ubuntu:18.04.
- Add `exp` to `lib_compat.h` to solve the GLIBC 2.29 dependency issue.

Fixes https://github.com/clangd/clangd/issues/2244

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,30 @@
+---
+name: Bug report
+about: A problem encountered using clangd
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Please describe the problem.
+For hints on what information is helpful, see: https://clangd.llvm.org/troubleshooting.html
+
+If you can, provide a minimal chunk of code that shows the problem (either inline, or attach it if larger).
+
+**Logs**
+
+Please attach the clangd stderr log if you can. (Usually available from the editor)
+If possible, run with `--log=verbose` - note that the logs will include the contents of open files!
+If this is a crash, try to put `llvm-symbolizer` on your PATH per the troubleshooting instructions.
+(If you're using Windows, place the associated PDB file (debug symbols) in the same directory as
+clangd.exe and rerun again. For official releases, download symbols from the
+[release page](https://github.com/clangd/clangd/releases).)
+
+**System information**
+
+Output of `clangd --version`:
+
+Editor/LSP plugin:
+
+Operating system:

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,4 @@
+contact_links:
+   - name: Questions and discussions
+     url: https://github.com/clangd/clangd/discussions
+     about: Usage questions, ideas and proposals

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,10 @@
+---
+name: Feature request
+about: Suggest an idea for clangd
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+

.github/ISSUE_TEMPLATE/release_cherrypick.md

@@ -0,0 +1,13 @@
+---
+name: Cherry-pick for release
+about: Nominate a bug fix to be backported to the current release branch
+title: 'Cherrypick: '
+labels: cherrypick
+assignees: ''
+
+---
+
+Commit:
+-  llvm/llvm-project@
+
+Why is this important or safe?

.github/actions/pick/action.yml

@@ -1,15 +0,0 @@
-name: 'Pick commit'
-description: 'Pick last successful commit from a repo'
-inputs:
-  repo:
-    description: 'Github repository e.g. llvm/llvm-project'
-    required: true
-  token:
-    description: 'Github auth token'
-    required: true
-outputs:
-  sha:
-    description: 'The SHA1 of the picked commit'
-runs:
-  using: 'node12'
-  main: 'index.js'

.github/actions/pick/index.js

@@ -1,18 +0,0 @@
-const core = require('@actions/core');
-const last = require('last-successful-gh-commit').default;
-try {
-  var parts = core.getInput('repo').split('/', 2);
-  last({
-    owner: parts[0],
-    name: parts[1],
-    token: core.getInput('token'),
-  })
-  .then(commit => core.setOutput('sha', commit.node.oid))
-  .catch(error => {
-    console.error(error);
-    core.setFailed(error.message);
-  });
-} catch (error) {
-  console.error(error);
-  core.setFailed(error.message);
-}

.github/actions/pick/package-lock.json

@@ -1,56 +0,0 @@
-{
-  "name": "pick",
-  "version": "1.0.0",
-  "lockfileVersion": 1,
-  "requires": true,
-  "dependencies": {
-    "@actions/core": {
-      "version": "1.2.2",
-      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.2.2.tgz",
-      "integrity": "sha512-IbCx7oefq+Gi6FWbSs2Fnw8VkEI6Y4gvjrYprY3RV//ksq/KPMlClOerJ4jRosyal6zkUIc8R9fS/cpRMlGClg=="
-    },
-    "axios": {
-      "version": "0.16.2",
-      "resolved": "https://registry.npmjs.org/axios/-/axios-0.16.2.tgz",
-      "integrity": "sha1-uk+S8XFn37q0CYN4VFS5rBScPG0=",
-      "requires": {
-        "follow-redirects": "^1.2.3",
-        "is-buffer": "^1.1.5"
-      }
-    },
-    "debug": {
-      "version": "3.2.6",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
-      "integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
-      "requires": {
-        "ms": "^2.1.1"
-      }
-    },
-    "follow-redirects": {
-      "version": "1.10.0",
-      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.10.0.tgz",
-      "integrity": "sha512-4eyLK6s6lH32nOvLLwlIOnr9zrL8Sm+OvW4pVTJNoXeGzYIkHVf+pADQi+OJ0E67hiuSLezPVPyBcIZO50TmmQ==",
-      "requires": {
-        "debug": "^3.0.0"
-      }
-    },
-    "is-buffer": {
-      "version": "1.1.6",
-      "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-1.1.6.tgz",
-      "integrity": "sha512-NcdALwpXkTm5Zvvbk7owOUSvVvBKDgKP5/ewfXEznmQFfs4ZRmanOeKBTjRVjka3QFoN6XJ+9F3USqfHqTaU5w=="
-    },
-    "last-successful-gh-commit": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/last-successful-gh-commit/-/last-successful-gh-commit-1.0.1.tgz",
-      "integrity": "sha1-8Mn8HfEvb764g/5vrcy3W4p5EVo=",
-      "requires": {
-        "axios": "^0.16.2"
-      }
-    },
-    "ms": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
-      "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
-    }
-  }
-}

.github/actions/pick/package.json

@@ -1,14 +0,0 @@
-{
-  "name": "pick",
-  "version": "1.0.0",
-  "description": "Pick the last successful commit from a github repo",
-  "main": "index.js",
-  "scripts": {},
-  "keywords": [],
-  "author": "sam.mccall@gmail.com",
-  "license": "Apache-2.0",
-  "dependencies": {
-    "@actions/core": "^1.2.2",
-    "last-successful-gh-commit": "^1.0.1"
-  }
-}

.github/workflows/autobuild.yaml

@@ -1,78 +1,205 @@
-# Workflow to build binaries for a release.
-# Triggered by release creation, which should include `llvm-project@<full-sha>`.
+# Workflow to build binaries and release them.
+# Triggered by the schedule or manual dispatch, which might include
+# `<owner/llvm-project>@<full-sha>`.
 #
 # Because the build takes more than an hour, our GITHUB_TOKEN credentials may
 # expire. A token `secrets.RELEASE_TOKEN` must exist with public_repo scope.
 name: Build release binaries
+env:
+  ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: true
 on:
-  release:
-    types: created
+  # Run weekly on sunday at 21:37 UTC (arbitrary)
+  schedule:
+  - cron: '37 21 * * SUN'
+  workflow_dispatch:
+    inputs:
+      commit:
+        description: 'Commit to build from'
+        required: true
+      repo:
+        description: 'Repository to build from'
+        required: true
+        default: 'llvm/llvm-project'
+      release_name:
+        description: 'Release name'
+        required: true
+      tag:
+        description: 'Tag name'
+        required: true
+      description:
+        description: 'Release description'
+        required: true
 jobs:
-  prepare:
+  schedule_environment:
+    name: Create default build environment
     runs-on: ubuntu-latest
+    if: ${{ github.event_name == 'schedule' }}
     steps:
-    - name: Find LLVM commit
+    - name: Install deps
       run: |
-        grep -m 1 -o "llvm-project@[[:xdigit:]]\{40,\}" << EOF | cut -f 2 -d@ > commit
-        ${{ github.event.release.body }}
-        EOF
-    - name: Mark as draft
+        sudo apt-get install jq
+    - name: Clone scripts
+      uses: actions/checkout@v2
+    # Choose the commit to build a release from.
+    #
+    # We want to avoid unbuildable revisions: choose the last green from CI.
+    # FIXME: The criteria should be some consistent set of buildbots passing.
+    # Use clangd/actions/pick after
+    # https://github.com/ramasilveyra/last-successful-gh-commit/issues/2 has
+    # been addressed.
+    - name: Get commit hash for LLVM head
       run: >
-        curl --fail --show-error -XPATCH
-        "-HAuthorization: Bearer ${{ secrets.RELEASE_TOKEN }}"
-        "https://api.github.com/repos/${{ github.repository }}/releases/${{ github.event.release.id }}"
-        "-d" '{"draft": true}'
-    - name: Persist release info
-      uses: actions/upload-artifact@v1
+        COMMIT=$(curl --fail --show-error
+        "https://api.github.com/repos/llvm/llvm-project/commits/main" |
+        jq ".sha" -r)
+
+        echo "LLVM_COMMIT=$COMMIT" >> $GITHUB_ENV
+    - name: Compute release info
+      run: |
+        echo "RELEASE_COMMIT_SHORT=$(printf '%.12s' ${{ env.LLVM_COMMIT }})" >> $GITHUB_ENV
+        echo "RELEASE_DATE=$(date -u +%Y%m%d)" >> $GITHUB_ENV
+        echo "LLVM_REPO=llvm/llvm-project" >> commit.env
+        echo "LLVM_COMMIT=${{ env.LLVM_COMMIT }}" >> commit.env
+    - name: Use date as the tag name
+      run: >
+        echo "TAG_NAME=snapshot_${{ env.RELEASE_DATE }}" >> commit.env
+    - name: Use date and release commit as release name
+      run: >
+        echo "RELEASE_NAME=${{ env.RELEASE_DATE }} @${{ env.RELEASE_COMMIT_SHORT }}" >> commit.env
+    - name: Generate default release description
+      run: >
+        echo "RELEASE_DESCRIPTION=Unstable snapshot of clangd on ${{ env.RELEASE_DATE }}." >> commit.env
+    - name: Upload result
+      uses: actions/upload-artifact@v4
+      with:
+        name: env
+        path: commit.env
+  workflow_dispatch_environment:
+    name: Use inputs to create build environment
+    runs-on: ubuntu-latest
+    if: ${{ github.event_name == 'workflow_dispatch' }}
+    steps:
+    - name: Use repo and commit from the inputs
+      run: |
+        echo "LLVM_REPO=${{ github.event.inputs.repo }}" >> commit.env
+        echo "LLVM_COMMIT=${{ github.event.inputs.commit }}" >> commit.env
+        echo "TAG_NAME=${{ github.event.inputs.tag }}" >> commit.env
+        echo "RELEASE_NAME=${{ github.event.inputs.release_name }}" >> commit.env
+        echo "RELEASE_DESCRIPTION=${{ github.event.inputs.description }}" >> commit.env
+    - name: Upload result
+      uses: actions/upload-artifact@v4
+      with:
+        name: env
+        path: commit.env
+  create_release:
+    name: Create release
+    runs-on: ubuntu-latest
+    needs: [schedule_environment, workflow_dispatch_environment]
+    # Use always() and manually check results here since GitHub Actions do not
+    # support conditionally skipping jobs and there is no way to "exit with
+    # success" from a job.
+    if: always() && (needs.schedule_environment.result == 'success' || needs.workflow_dispatch_environment.result == 'success')
+    steps:
+    - name: Fetch environment variables
+      uses: actions/download-artifact@v4
+      with:
+        name:
+          env
+        path:
+          env
+    - name: Set environment variables
+      run: |
+        cat env/commit.env >> $GITHUB_ENV
+    - name: Create release
+      uses: actions/create-release@master
+      id: create_release
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        tag_name: ${{ env.TAG_NAME }}
+        release_name: ${{ env.RELEASE_NAME }}
+        body: |
+          ${{ env.RELEASE_DESCRIPTION }}
+
+          Built from ${{ env.LLVM_REPO }}@${{ env.LLVM_COMMIT }}.
+        prerelease: true
+        draft: true
+    - name: Preserve release info
+      run: |
+        echo "UPLOAD_URL=${{ steps.create_release.outputs.upload_url }}" >> release.env
+        echo "TAG_NAME=${{ env.TAG_NAME }}" >> release.env
+        echo "RELEASE_ID=${{ steps.create_release.outputs.id }}" >> release.env
+    - name: Upload result
+      uses: actions/upload-artifact@v4
       with:
         name: release
-        path: commit
+        path: release.env
   # Build clangd using CMake/Ninja.
   #
   # This step is a template that runs on each OS, build config varies slightly.
   # Uploading releases needs a per-job token that expires after an hour.
   build:
     name: Build ${{ matrix.config.name }}
-    needs: prepare
-    runs-on: ${{ matrix.config.os }}
+    needs: create_release
+    if: always() && needs.create_release.result == 'success'
     strategy:
       fail-fast: false
       matrix:
         config:
         - name: windows
-          os: windows-latest
-          preinstall: choco install ninja
+          os: windows-2019
+          preinstall: choco install ninja nasm
           vcvars: C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvars64.bat
-          # FIXME: remove ALLOW_OLD_TOOLCHAIN once VS 16.5 is available.
-          cmake: >
+          cflags: /O2 /DNDEBUG
+          cmake: >-
             "-DCMAKE_C_COMPILER=cl"
             "-DCMAKE_CXX_COMPILER=cl"
-            "-DCMAKE_CXX_FLAGS_RELEASE=/O2 /DNDEBUG"
-            "-DCMAKE_C_FLAGS_RELEASE=/O2 /DNDEBUG"
             "-DLLVM_ENABLE_ZLIB=OFF"
-            "-DLLVM_USE_CRT_RELEASE=MT"
-            "-DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=ON"
+            "-DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded"
+            "-DLLVM_ENABLE_PDB=ON"
+            "-DLLVM_PARALLEL_LINK_JOBS=1"
+          grpc_cmake: >-
+            "-DgRPC_MSVC_STATIC_RUNTIME=ON"
+          binary_extension: ".exe"
         - name: mac
-          os: macos-latest
+          os: macos-13
           preinstall: brew install ninja zlib p7zip
-          cmake: >
+          cflags: -O3 -gline-tables-only -DNDEBUG
+          cmake: >-
             "-DCMAKE_C_COMPILER=clang"
             "-DCMAKE_CXX_COMPILER=clang++"
-            "-DCMAKE_C_FLAGS_RELEASE=-O3 -gline-tables-only -DNDEBUG"
-            "-DCMAKE_CXX_FLAGS_RELEASE=-O3 -gline-tables-only -DNDEBUG"
             "-DLLVM_ENABLE_ZLIB=FORCE_ON"
+            "-DCMAKE_OSX_ARCHITECTURES=x86_64;arm64"
+            "-DCMAKE_OSX_DEPLOYMENT_TARGET=10.13"
+          # BoringSSL doesn't support universal binaries when building with ASM.
+          grpc_cmake: >-
+            "-DOPENSSL_NO_ASM=ON"
         - name: linux
           os: ubuntu-latest
-          preinstall: sudo apt-get install ninja-build libz-dev
-          cmake: >
-            "-DCMAKE_C_COMPILER=clang"
-            "-DCMAKE_CXX_COMPILER=clang++"
-            "-DCMAKE_CXX_FLAGS_RELEASE=-O3 -gline-tables-only -DNDEBUG"
-            "-DCMAKE_C_FLAGS_RELEASE=-O3 -gline-tables-only -DNDEBUG"
+          container: ubuntu:20.04
+          preinstall: >-
+            apt-get update &&
+            apt-get install -y ninja-build libz-dev libc-ares-dev wget clang-9
+            software-properties-common p7zip-full curl &&
+            add-apt-repository ppa:git-core/ppa &&
+            wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | apt-key add - &&
+            apt-add-repository 'deb https://apt.kitware.com/ubuntu/ bionic main' &&
+            apt-get update &&
+            apt-get install -y git cmake python3.8 python3.8-dev
+          cflags: -O3 -gline-tables-only -DNDEBUG -include $GITHUB_WORKSPACE/.github/workflows/lib_compat.h
+          cmake: >-
+            "-DCMAKE_C_COMPILER=clang-9"
+            "-DCMAKE_CXX_COMPILER=clang++-9"
             "-DCMAKE_EXE_LINKER_FLAGS_RELEASE=-static-libgcc -Wl,--compress-debug-sections=zlib"
             "-DLLVM_STATIC_LINK_CXX_STDLIB=ON"
             "-DLLVM_ENABLE_ZLIB=FORCE_ON"
-            "-DZLIB_LIBRARY=/usr/lib/x86_64-linux-gnu/libz.a"
+            "-DCMAKE_PROJECT_INCLUDE=$GITHUB_WORKSPACE/.github/workflows/linux-static-deps.cmake"
+          # Using c-ares as a module prevents dynamic linking of unneeded
+          # libraries. All other gRPC dependencies can be built from sources.
+          grpc_cmake: >-
+            "-DgRPC_CARES_PROVIDER=package"
+    runs-on: ${{ matrix.config.os }}
+    container: ${{ matrix.config.container }}
     steps:
     - name: Clone scripts
       uses: actions/checkout@v2
@@ -88,20 +215,65 @@ jobs:
       run: |
         cmd /c "`"${{ matrix.config.vcvars }}`">NUL && set" | Foreach-Object {
           $name, $value = $_ -split '=', 2
-          if ($value) { echo "::set-env name=$($name)::$($value)" }
+          if ($value) {
+            echo "$($name)=$($value)" >> $env:GITHUB_ENV
+          }
         }
+    - name: Clone gRPC
+      uses: actions/checkout@v2
+      with:
+        repository: grpc/grpc
+        path: grpc
+        # We use the same version of gRPC for LLVM's clangd-ubuntu-tsan
+        # buildbot.
+        # https://github.com/llvm/llvm-zorg/blob/main/buildbot/google/docker/buildbot-clangd-ubuntu-clang/Dockerfile
+        ref: v1.36.3
+        submodules: recursive
+    - name: Build gRPC
+      run: >
+        mkdir $HOME/grpc-installation
+
+        mkdir grpc-build
+
+        cmake -G Ninja -S grpc -B grpc-build
+        "-DgRPC_INSTALL=ON"
+        "-DCMAKE_INSTALL_PREFIX=$HOME/grpc-installation"
+        "-DCMAKE_BUILD_TYPE=Release"
+        "-DCMAKE_C_FLAGS_RELEASE=${{ matrix.config.cflags }}"
+        "-DCMAKE_CXX_FLAGS_RELEASE=${{ matrix.config.cflags }}"
+        ${{ matrix.config.grpc_cmake }} ${{ matrix.config.cmake }}
+
+        ninja -C grpc-build install
     - name: Fetch target commit
-      uses: actions/download-artifact@v1
-      with: { name: release }
-    - name: Set target commit
+      uses: actions/download-artifact@v4
+      with:
+        name:
+          env
+        path:
+          env
+    - name: Fetch release info
+      uses: actions/download-artifact@v4
+      with:
+        name:
+          release
+        path:
+          release
+    - name: Put release info into env
       run: |
-        echo ::set-env name=LLVM_COMMIT::$(cat release/commit)
-        echo ::set-env name=CLANGD_DIR::clangd_${{ github.event.release.tag_name }}
+        cat env/commit.env >> $GITHUB_ENV
+        cat release/release.env >> $GITHUB_ENV
+      shell: bash
+      # Use environment variables set above to create a directory. This needs
+      # to be a separate step because they are not in the context yet when
+      # being set.
+    - name: Set build directory
+      run: |
+        echo "CLANGD_DIR=clangd_${{ env.TAG_NAME }}" >> $GITHUB_ENV
       shell: bash
     - name: Clone LLVM
       uses: actions/checkout@v2
       with:
-        repository: llvm/llvm-project
+        repository: ${{ env.LLVM_REPO }}
         path: llvm-project
         ref: ${{ env.LLVM_COMMIT }}
     - name: CMake
@@ -111,43 +283,98 @@ jobs:
         cp llvm-project/llvm/LICENSE.TXT ${{ env.CLANGD_DIR }}
 
         cmake -G Ninja -S llvm-project/llvm -B ${{ env.CLANGD_DIR }}
-        "-DLLVM_ENABLE_PROJECTS=clang;clang-tools-extra"
+        "-DLLVM_ENABLE_PROJECTS=clang;clang-tools-extra;openmp"
         "-DLLVM_ENABLE_ASSERTIONS=OFF"
         "-DLLVM_ENABLE_BACKTRACES=ON"
         "-DLLVM_ENABLE_TERMINFO=OFF"
         "-DCMAKE_BUILD_TYPE=Release"
         "-DCLANG_PLUGIN_SUPPORT=OFF"
         "-DLLVM_ENABLE_PLUGINS=OFF"
+        "-DCMAKE_C_FLAGS_RELEASE=${{ matrix.config.cflags }}"
+        "-DCMAKE_CXX_FLAGS_RELEASE=${{ matrix.config.cflags }}"
+        "-DCLANGD_ENABLE_REMOTE=ON"
+        "-DLLVM_ENABLE_ZSTD=OFF"
+        "-DGRPC_INSTALL_PATH=$HOME/grpc-installation"
         ${{ matrix.config.cmake }}
     - name: Ninja
-      run: ninja -C ${{ env.CLANGD_DIR }} clangd
-    - name: Archive
+      run: >
+        ninja -C ${{ env.CLANGD_DIR }} clangd clangd-indexer clangd-index-server
+        clangd-index-server-monitor
+    - name: Install OpenMP headers
+      shell: bash
+      run: >
+        cp ${{ env.CLANGD_DIR }}/projects/openmp/runtime/src/omp{,-tools}.h ${{ env.CLANGD_DIR }}/lib/clang/*/include
+        || true # Don't let the non-existing omp headers block the release.
+    - name: Archive clangd
       run: >
         7z a clangd.zip
         ${{ env.CLANGD_DIR }}/LICENSE.TXT
-        ${{ env.CLANGD_DIR }}/bin/clangd*
+        ${{ env.CLANGD_DIR }}/bin/clangd${{ matrix.config.binary_extension }}
         ${{ env.CLANGD_DIR }}/lib/clang
-    - name: Upload artifact
-      uses: actions/upload-artifact@v1
-      with:
-        name: ${{ matrix.config.name }}
-        path: clangd.zip
-    - name: Upload asset
+    - name: Archive clangd PDB symbols
+      if: matrix.config.name == 'windows'
+      run: >
+        7z a clangd-pdb.7z -t7z -m0=LZMA2
+        ${{ env.CLANGD_DIR }}/LICENSE.TXT
+        ${{ env.CLANGD_DIR }}/bin/clangd.pdb
+    - name: Archive indexing-tools
+      run: >
+        7z a indexing-tools.zip
+        ${{ env.CLANGD_DIR }}/LICENSE.TXT
+        ${{ env.CLANGD_DIR }}/bin/clangd-indexer${{ matrix.config.binary_extension }}
+        ${{ env.CLANGD_DIR }}/bin/clangd-index-server${{ matrix.config.binary_extension }}
+        ${{ env.CLANGD_DIR }}/bin/clangd-index-server-monitor${{ matrix.config.binary_extension }}
+        ${{ env.CLANGD_DIR }}/lib/clang
+    - name: Upload clangd asset
       uses: actions/upload-release-asset@v1.0.1
-      env: { GITHUB_TOKEN: "${{ secrets.RELEASE_TOKEN }}" }
+      env:
+        GITHUB_TOKEN: ${{ secrets.RELEASE_TOKEN }}
       with:
-        upload_url: ${{ github.event.release.upload_url }}
-        asset_name: clangd-${{ matrix.config.name }}-${{ github.event.release.tag_name }}.zip
+        upload_url: ${{ env.UPLOAD_URL }}
+        asset_name: clangd-${{ matrix.config.name }}-${{ env.TAG_NAME }}.zip
         asset_path: clangd.zip
         asset_content_type: application/zip
+    - name: Upload clangd PDB asset
+      if: matrix.config.name == 'windows'
+      uses: actions/upload-release-asset@v1.0.1
+      env:
+        GITHUB_TOKEN: ${{ secrets.RELEASE_TOKEN }}
+      with:
+        upload_url: ${{ env.UPLOAD_URL }}
+        asset_name: clangd-${{ matrix.config.name }}-${{ env.TAG_NAME }}-debug-symbols.7z
+        asset_path: clangd-pdb.7z
+        asset_content_type: application/zip
+    - name: Upload indexing-tools asset
+      uses: actions/upload-release-asset@v1.0.1
+      env:
+        GITHUB_TOKEN: ${{ secrets.RELEASE_TOKEN }}
+      with:
+        upload_url: ${{ env.UPLOAD_URL }}
+        asset_name: clangd_indexing_tools-${{ matrix.config.name }}-${{ env.TAG_NAME }}.zip
+        asset_path: indexing-tools.zip
+        asset_content_type: application/zip
+    - name: Check binary compatibility
+      if: matrix.config.name == 'linux'
+      run: .github/workflows/lib_compat_test.py --lib=GLIBC_2.18 "$CLANGD_DIR/bin/clangd"
   # Create the release, and upload the artifacts to it.
   finalize:
     runs-on: ubuntu-latest
     needs: build
+    if: always() && needs.build.result == 'success'
     steps:
+    - name: Fetch release info
+      uses: actions/download-artifact@v4
+      with:
+        name:
+          release
+        path:
+          release
+    - name: Update the env variables
+      run: >
+        cat release/release.env >> $GITHUB_ENV
     - name: Publish release
       run: >
         curl -XPATCH
         "-HAuthorization: Bearer ${{ secrets.RELEASE_TOKEN }}"
-        "https://api.github.com/repos/${{ github.repository }}/releases/${{ github.event.release.id }}"
+        "https://api.github.com/repos/${{ github.repository }}/releases/${{ env.RELEASE_ID }}"
         "-d" '{"draft": false}'

.github/workflows/lib_compat.h

@@ -0,0 +1,21 @@
+// This header forces the use of a particular version of glibc symbols.
+// This can make the resulting binary portable to systems with older glibcs.
+//
+// It must be included in each TU, with CFLAGS="-include glibc_compat.h" etc.
+//
+// We only list symbols known to be used. This is paired with a test enforcing
+// the max glibc symbol version. If the test fails, the list should be extended.
+// Find the old alternatives version to target with e.g.:
+//   objdump -T /lib/x86_64-linux-gnu/lib{c,m,pthread,rt}.so.* | grep "\bexpf\b"
+
+#define FORCE_SYMBOL_VERSION(sym, version) \
+  __asm__(".symver " #sym "," #sym "@" #version)
+
+FORCE_SYMBOL_VERSION(exp2, GLIBC_2.2.5);
+FORCE_SYMBOL_VERSION(expf, GLIBC_2.2.5);
+FORCE_SYMBOL_VERSION(log, GLIBC_2.2.5);
+FORCE_SYMBOL_VERSION(log2, GLIBC_2.2.5);
+FORCE_SYMBOL_VERSION(pow, GLIBC_2.2.5);
+FORCE_SYMBOL_VERSION(exp, GLIBC_2.2.5);
+
+#undef FORCE_SYMBOL_VERSION

.github/workflows/lib_compat_test.py

@@ -0,0 +1,89 @@
+#!/usr/bin/env python3
+
+# Verifies a binary uses only dynamic symbols from whitelisted library versions.
+# Prints the disallowed symbols and their versions on failure.
+# Usage: lib_compat_test.py bin/clangd --lib=GLIBC_2.18
+
+import argparse
+import subprocess
+import sys
+
+parser = argparse.ArgumentParser()
+parser.add_argument("binary")
+parser.add_argument(
+    "--lib",
+    action="append",
+    default=[],
+    help="Whitelist a library, e.g. GLIBC_2.18 or GLIBC",
+)
+parser.add_argument(
+    "--sym", action="append", default=[], help="Whitelist a symbol, e.g. crc32"
+)
+args = parser.parse_args()
+
+# Parses GLIBC_2.3 into ("GLIBC", [2,3])
+# Parses GLIBC into ("GLIBC", None)
+def parse_version(version):
+    parts = version.rsplit("_", 1)
+    if len(parts) == 1:
+        return (version, None)
+    try:
+        return (parts[0], [int(p) for p in parts[1].split(".")])
+    except ValueError:
+        return (version, None)
+
+
+lib_versions = dict([parse_version(v) for v in args.lib])
+
+# Determines whether all symbols with version 'lib' are acceptable.
+# A versioned library is name_x.y.z by convention.
+def accept_lib(lib):
+    (lib, ver) = parse_version(lib)
+    if not lib in lib_versions:  # Non-whitelisted library.
+        return False
+    if lib_versions[lib] is None:  # Unrestricted version
+        return True
+    if ver is None:  # Lib has non-numeric version, library restricts version.
+        return False
+    return ver <= lib_versions[lib]
+
+
+# Determines whether an optionally-versioned symbol is acceptable.
+# A versioned symbol is symbol@version as output by nm.
+def accept_symbol(sym):
+    if sym in args.sym:
+        return True
+    split = sym.split("@", 1)
+    return (split[0] in args.sym) or (len(split) == 2 and accept_lib(split[1]))
+
+
+# Run nm to find the undefined symbols, and check whether each is acceptable.
+nm = subprocess.run(
+    ["nm", "-uD", "--with-symbol-version", args.binary],
+    stdout=subprocess.PIPE,
+    universal_newlines=True,
+)
+nm.check_returncode()
+status = 0
+for line in nm.stdout.splitlines():
+    # line = "       U foo@GLIBC_2.3"
+    parts = line.split()
+    if len(parts) != 2:
+        print("Unparseable nm output: ", line, file=sys.stderr)
+        status = 2
+        continue
+    if parts[0] == "w":  # Weak-undefined symbol, not actually required.
+        continue
+    if not accept_symbol(parts[1]):
+        print(parts[1])
+        status = 1
+if status == 1:
+    print(
+        "Binary depends on disallowed symbols above. Use some combination of:\n"
+        " - relax the whitelist by adding --lib and --sym flags to this test\n"
+        " - force older symbol versions by updating lib_compat.h\n"
+        " - avoid dynamic dependencies by changing CMake configuration\n"
+        " - remove bad dependencies from the code",
+        file=sys.stderr,
+    )
+sys.exit(status)

.github/workflows/linux-static-deps.cmake

@@ -0,0 +1,3 @@
+# Convince find_package() to link against libz.a instead of libz.so.
+# The default is ".so;.a", meaning dynamic libraries are preferred.
+set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")

.github/workflows/periodic.yaml

@@ -1,55 +0,0 @@
-# Workflow to create an auto-buildable release periodically.
-#
-# Releases created with automation credentials don't trigger workflows.
-# Therefore a token `secrets.RELEASE_TOKEN` must exist with public_repo scope.
-name: Periodic release
-on:
-  # Run weekly on sunday at 21:37 UTC (arbitrary)
-  schedule:
-  - cron: '37 21 * * SUN'
-  # Allow triggering manually:
-  # curl -XPOST -d '{"event_type":"periodic"}' \
-  #  "-HAuthorization: Bearer <token>" \
-  #   https://api.github.com/repos/clangd/clangd/dispatches
-  repository_dispatch: { types: periodic }
-jobs:
-  # Choose the commit to build a release from.
-  #
-  # We want to avoid unbuildable revisions: choose the last green from CI.
-  # FIXME: the criteria should be some consistent set of buildbots passing.
-  pick:
-    name: Create draft release
-    runs-on: ubuntu-latest
-    steps:
-    - name: Clone scripts
-      uses: actions/checkout@v2
-    - name: Install NPM dependencies
-      run: npm install --prefix .github/actions/pick
-    - name: Pick last successful commit
-      id: pick
-      uses: ./.github/actions/pick
-      with:
-        repo: llvm/llvm-project
-        token: ${{ secrets.GITHUB_TOKEN }}
-    - name: Compute release info
-      run: |
-        echo ::set-env name=RELEASE_COMMIT_SHORT::$(printf "%.12s" ${{ steps.pick.outputs.sha }})
-        echo ::set-env name=RELEASE_DATE::$(date -u +%Y%m%d)
-    - name: Create release
-      uses: actions/create-release@master
-      id: release
-      env: { GITHUB_TOKEN: "${{ secrets.RELEASE_TOKEN }}" }
-      with:
-        tag_name: snapshot_${{ env.RELEASE_DATE }}
-        release_name: ${{ env.RELEASE_DATE }} @${{ env.RELEASE_COMMIT_SHORT }}
-        body: |
-          Unstable snapshot of clangd on ${{ env.RELEASE_DATE }}.
-
-          Built from llvm/llvm-project@${{ steps.pick.outputs.sha }}.
-        prerelease: true
-        # It would be nice to use draft releases, to hide them from users.
-        # But drafts don't fire events to trigger the autobuild workflow.
-        # Instead, that workflow marks the release as draft until it's built.
-        # As a result, the empty release will be briefly visible to users.
-        draft: false
-

LICENSE

@@ -0,0 +1,219 @@
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+Software.
+

README.md

@@ -3,11 +3,10 @@
 clangd is a language server, and provides C++ IDE features to editors.
 This is not its documentation.
 
-- the **website** is https://clangd.github.io/.
+- the **website** is https://clangd.llvm.org/.
 - the **bug tracker** is in this repository: https://github.com/clangd/clangd/issues
-- the **source code** is hosted at http://llvm.org/, and mirrored at
-  https://github.com/llvm/llvm-project/tree/master/clang-tools-extra/clangd.
-- the **website source code** is at https://github.com/clangd/clangd.github.io/
+- the **source code** is hosted at https://github.com/llvm/llvm-project/tree/main/clang-tools-extra/clangd.
+- the **website source code** is at https://github.com/llvm/clangd-www/
 
 ### Communication channels
 
@@ -16,5 +15,5 @@ through one of these channels:
 
 - chat: #clangd room hosted on [LLVM's Discord
   channel](https://discord.gg/xS7Z362).
-- user questions and feature requests can be asked in Clangd topic on [LLVM
+- user questions and feature requests can be asked in the clangd topic on [LLVM
   Discussion Forums](https://llvm.discourse.group/c/llvm-project/clangd/34)

logo/.gitignore

@@ -0,0 +1 @@
+card-*.png

logo/build.sh

@@ -0,0 +1,21 @@
+#!/bin/bash -ex
+
+SMALLER="-strip -define png:compression-filter=3"
+PAD_TO="-background none -gravity center -extent"
+LOGO_ONLY="--export-id=CD --export-background-opacity=0"
+CONTRAST="-level 20%,100%,1.4"
+inkscape clangd.svg $LOGO_ONLY --export-plain-svg=logo.svg
+inkscape clangd.svg --export-png=card.png -h=640
+mogrify $SMALLER card.png
+inkscape clangd.svg --export-png=logo.png -h=1024 $LOGO_ONLY
+mogrify $SMALLER $PAD_TO 1024x1024 logo.png
+inkscape clangd.svg --export-png=favicon.png -h=16 $LOGO_ONLY --export-area-snap
+mogrify -define png:exclude-chunk=all $CONTRAST $PAD_TO 16x16 favicon.png
+
+# Set CARD="vscode coc www" to generate cards with subtitles.
+for CARD in $CARDS; do
+  xmlstarlet < clangd.svg edit -P \
+    --update "//*[@id='subtitle']/*[local-name()='tspan']" --value "$CARD" \
+    | inkscape - --export-png=card-$CARD.png -h=640
+  mogrify $SMALLER card-$CARD.png
+done

logo/clangd.svg

@@ -0,0 +1,190 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:osb="http://www.openswatchbook.org/uri/2009/osb"
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="200mm"
+   height="100mm"
+   viewBox="0 0 200 100"
+   version="1.1"
+   id="svg8"
+   inkscape:export-filename="/home/sammccall/card.png"
+   inkscape:export-xdpi="162.56"
+   inkscape:export-ydpi="162.56"
+   inkscape:version="0.92.4 (5da689c313, 2019-01-14)"
+   sodipodi:docname="clangd.svg">
+  <defs
+     id="defs2">
+    <linearGradient
+       inkscape:collect="always"
+       id="linearGradient6203">
+      <stop
+         id="stop6201"
+         offset="0"
+         style="stop-color:#f0f8a0;stop-opacity:1" />
+      <stop
+         style="stop-color:#c1e0a4;stop-opacity:1;"
+         offset="0.75"
+         id="stop6272" />
+      <stop
+         id="stop6199"
+         offset="1"
+         style="stop-color:#5aab7b;stop-opacity:1" />
+    </linearGradient>
+    <linearGradient
+       inkscape:collect="always"
+       id="linearGradient6195">
+      <stop
+         style="stop-color:#0f5499;stop-opacity:1"
+         offset="0"
+         id="stop6191" />
+      <stop
+         style="stop-color:#0ed6ff;stop-opacity:1"
+         offset="1"
+         id="stop6193" />
+    </linearGradient>
+    <linearGradient
+       id="linearGradient6119"
+       osb:paint="solid">
+      <stop
+         style="stop-color:#75af89;stop-opacity:1;"
+         offset="0"
+         id="stop6117" />
+    </linearGradient>
+    <linearGradient
+       inkscape:collect="always"
+       xlink:href="#linearGradient6195"
+       id="linearGradient6197"
+       x1="87.3125"
+       y1="236.14583"
+       x2="109.80209"
+       y2="199.10417"
+       gradientUnits="userSpaceOnUse"
+       gradientTransform="translate(-42.33333,27.781253)" />
+    <radialGradient
+       inkscape:collect="always"
+       xlink:href="#linearGradient6203"
+       id="radialGradient6287"
+       cx="93.45755"
+       cy="230.91721"
+       fx="93.45755"
+       fy="230.91721"
+       r="20.843767"
+       gradientTransform="matrix(-2.0309823,-8.6890853e-7,7.0332774e-7,-1.6935434,253.83964,637.53298)"
+       gradientUnits="userSpaceOnUse" />
+    <radialGradient
+       inkscape:collect="always"
+       xlink:href="#linearGradient6203"
+       id="radialGradient6314"
+       gradientUnits="userSpaceOnUse"
+       gradientTransform="matrix(-2.0309823,-8.6890853e-7,7.0332774e-7,-1.6935434,253.83964,637.53298)"
+       cx="93.45755"
+       cy="230.91721"
+       fx="93.45755"
+       fy="230.91721"
+       r="20.843767" />
+    <linearGradient
+       inkscape:collect="always"
+       xlink:href="#linearGradient6195"
+       id="linearGradient6316"
+       gradientUnits="userSpaceOnUse"
+       gradientTransform="translate(-42.33333,27.781253)"
+       x1="87.3125"
+       y1="236.14583"
+       x2="109.80209"
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logo/logo.svg

@@ -0,0 +1,138 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:osb="http://www.openswatchbook.org/uri/2009/osb"
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   id="svg8"
+   version="1.1"
+   viewBox="0 0 54.916668 68.194359"
+   height="68.194359mm"
+   width="54.916668mm">
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+         offset="0.75"
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+         style="stop-color:#0ed6ff;stop-opacity:1" />
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+    <linearGradient
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releases.md

@@ -8,7 +8,8 @@ is being able to cut releases easily whenever we want.
 The releases are just a zip archive containing the `clangd` binary, and the
 clang builtin headers. They should be runnable immediately after extracting the
 archive. The linux binary has `libstdc++` and other dependencies statically
-linked for maximum portability.
+linked for maximum portability, and requires glibc 2.18 (the first version with
+`thread_local` support).
 
 ## Creating a release manually
 

scripts/compile_flags_json.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+import os, sys, json
+
+EXTS = ('.c','.C','.cpp','.cc','.cxx','.m','.mm'
+        '.h','.H','.hpp','.hh','.hxx')
+
+input = sys.argv[1] if len(sys.argv) > 1 else 'compile_flags.txt'
+driver = sys.argv[2] if len(sys.argv) > 2 else 'clang'
+with open(input) as f:
+    flags = [line.strip() for line in f]
+
+dir = os.path.dirname(os.path.abspath(input))
+
+entries = []
+
+for root, dirs, files in os.walk(dir):
+    for file in files:
+        ext = os.path.splitext(file)[1]
+        if ext in EXTS:
+            entries.append({
+                'directory': dir,
+                'file': os.path.join(dir, file),
+                'arguments': [driver] + flags + [os.path.join(dir, file)]})
+
+with open(os.path.join(dir, 'compile_commands.json'), 'w') as file:
+    json.dump(entries, file, indent=2)
+