Meta: Update to clang-19 in CI and build instructions

.devcontainer/devcontainer.json

@@ -6,7 +6,7 @@
         "ghcr.io/devcontainers/features/github-cli:1": {},
         "ghcr.io/devcontainers-contrib/features/pre-commit:2": {},
         "./features/ladybird": {
-            "llvm_version": 18
+            "llvm_version": 19
         },
         "./features/vcpkg-cache": {
             "release_triplet": true,
@@ -70,7 +70,7 @@
                 "git.inputValidationSubjectLength": 72,
                 // If clangd was obtained from a package manager, its path can be set here.
                 // Note: This has to be adjusted manually, to the "llvm_version" from above
-                "clangd.path": "clangd-18",
+                "clangd.path": "clangd-19",
                 "clangd.arguments": [
                     "--header-insertion=never" // See https://github.com/clangd/clangd/issues/1247
                 ]

.devcontainer/features/ladybird/devcontainer-feature.json

@@ -12,7 +12,7 @@
                 19,
                 "trunk"
             ],
-            "default": 18,
+            "default": 19,
             "description": "Select LLVM compiler version to use"
         }
     }

.devcontainer/features/ladybird/install.sh

@@ -3,7 +3,7 @@ set -e
 
 # Feature options
 
-LLVM_VERSION=${LLVM_VERSION:-18}
+LLVM_VERSION=${LLVM_VERSION:-19}
 ### Check distro
 
 if [ ! -f /etc/lsb-release ]; then

.github/actions/setup/action.yml

@@ -28,15 +28,15 @@ runs:
         set -e
 
         wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-        sudo add-apt-repository 'deb http://apt.llvm.org/noble/ llvm-toolchain-noble-18 main'
+        sudo add-apt-repository 'deb http://apt.llvm.org/noble/ llvm-toolchain-noble-19 main'
 
         sudo apt-get update -y
-        sudo apt-get install -y autoconf autoconf-archive automake build-essential ccache clang-18 clang++-18 cmake curl fonts-liberation2 \
+        sudo apt-get install -y autoconf autoconf-archive automake build-essential ccache clang-19 clang++-19 cmake curl fonts-liberation2 \
             gcc-13 g++-13 libegl1-mesa-dev libgl1-mesa-dev libpulse-dev libssl-dev \
-            libstdc++-13-dev lld-18 nasm ninja-build qt6-base-dev qt6-tools-dev-tools tar unzip zip
+            libstdc++-13-dev lld-19 nasm ninja-build qt6-base-dev qt6-tools-dev-tools tar unzip zip
 
-        sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-18 100
-        sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-18 100
+        sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-19 100
+        sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-19 100
         sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-13 100
         sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-13 100
 
@@ -57,7 +57,7 @@ runs:
       run: |
         set -e
         brew update
-        brew install autoconf autoconf-archive automake bash ccache coreutils llvm@18 nasm ninja qt unzip wabt
+        brew install autoconf autoconf-archive automake bash ccache coreutils llvm@19 nasm ninja qt unzip wabt
 
     - name: 'Install vcpkg'
       shell: bash

.github/workflows/ladybird-js-artifacts.yml

@@ -52,8 +52,8 @@ jobs:
       - name: Create build directory Ubuntu
         run: |
           cmake --preset Distribution_CI \
-            -DCMAKE_C_COMPILER=clang-18 \
-            -DCMAKE_CXX_COMPILER=clang++-18 \
+            -DCMAKE_C_COMPILER=clang-19 \
+            -DCMAKE_CXX_COMPILER=clang++-19 \
             -DENABLE_GUI_TARGETS=OFF
         if: ${{ matrix.os_name == 'Linux' }}
 

.github/workflows/lagom-template.yml

@@ -64,8 +64,8 @@ jobs:
         run: |
           if ${{ inputs.os_name == 'Linux' }} ; then
             if ${{ inputs.toolchain == 'Clang' }} ; then
-              echo "host_cc=clang-18" >> "$GITHUB_OUTPUT"
-              echo "host_cxx=clang++-18" >> "$GITHUB_OUTPUT"
+              echo "host_cc=clang-19" >> "$GITHUB_OUTPUT"
+              echo "host_cxx=clang++-19" >> "$GITHUB_OUTPUT"
             elif ${{ inputs.toolchain == 'GNU' }} ; then
               echo "host_cc=gcc-13" >> "$GITHUB_OUTPUT"
               echo "host_cxx=g++-13" >> "$GITHUB_OUTPUT"

Documentation/BuildInstructionsLadybird.md

@@ -49,10 +49,10 @@ sudo wget -O /usr/share/keyrings/llvm-snapshot.gpg.key https://apt.llvm.org/llvm
 # Optional: Verify the GPG key manually
 
 # Use the key to authorize an entry for apt.llvm.org in apt sources list
-echo "deb [signed-by=/usr/share/keyrings/llvm-snapshot.gpg.key] https://apt.llvm.org/$(lsb_release -sc)/ llvm-toolchain-$(lsb_release -sc)-18 main" | sudo tee -a /etc/apt/sources.list.d/llvm.list
+echo "deb [signed-by=/usr/share/keyrings/llvm-snapshot.gpg.key] https://apt.llvm.org/$(lsb_release -sc)/ llvm-toolchain-$(lsb_release -sc)-19 main" | sudo tee -a /etc/apt/sources.list.d/llvm.list
 
 # Update apt package list and install clang and associated packages
-sudo apt update -y && sudo apt install clang-18 clangd-18 clang-format-18 clang-tidy-18 lld-18 -y
+sudo apt update -y && sudo apt install clang-19 clangd-19 clang-format-19 clang-tidy-19 lld-19 -y
 ```
 
 - Alternative: Install gcc-13 or newer from [Ubuntu Toolchain PPA](https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test):
@@ -102,7 +102,7 @@ sudo xbps-install -S git bash gcc python3 curl cmake zip unzip linux-headers mak
 ### NixOS or with Nix:
 
 > [!NOTE]
-> Ladybird's build system uses vcpkg to vendor third-party dependencies, which proves undesirable to use with Nix for [several reasons](https://github.com/LadybirdBrowser/ladybird/issues/371).  
+> Ladybird's build system uses vcpkg to vendor third-party dependencies, which proves undesirable to use with Nix for [several reasons](https://github.com/LadybirdBrowser/ladybird/issues/371).
 > As a result, using `ladybird.sh` to compile and run Ladybird will fail. Therefore, it is necessary to use system packages provided by the dev-shell.
 
 To build the project, first enter the shell:
@@ -145,7 +145,7 @@ brew install autoconf autoconf-archive automake ccache cmake nasm ninja pkg-conf
 
 If you wish to use clang from homebrew instead:
 ```
-brew install llvm@18
+brew install llvm@19
 ```
 
 If you also plan to use the Qt chrome on macOS:

Meta/Lagom/BuildFuzzers.sh

@@ -14,7 +14,7 @@ die() {
 
 pick_clang() {
     local BEST_VERSION=0
-    for CLANG_CANDIDATE in clang clang-17 clang-18 /opt/homebrew/opt/llvm/bin/clang ; do
+    for CLANG_CANDIDATE in clang clang-17 clang-18 clang-19 /opt/homebrew/opt/llvm/bin/clang ; do
         if ! command -v $CLANG_CANDIDATE >/dev/null 2>&1; then
             continue
         fi

Meta/find_compiler.sh

@@ -56,7 +56,7 @@ pick_host_compiler() {
         return
     fi
 
-    find_newest_compiler clang clang-17 clang-18 /opt/homebrew/opt/llvm/bin/clang
+    find_newest_compiler clang clang-17 clang-18 clang-19 /opt/homebrew/opt/llvm/bin/clang
     if is_supported_compiler "$HOST_COMPILER"; then
         export CC="${HOST_COMPILER}"
         export CXX="${HOST_COMPILER/clang/clang++}"