Meta+Docs+CI: Require clang-format >= 11

.github/workflows/cmake.yml

@@ -21,13 +21,17 @@ jobs:
     # sudo apt-get update -qq
 
     - name: Purge interfering packages
-      # Remove GCC 9 (installed by default)
-      run: sudo apt-get purge -y gcc-9 g++-9 libstdc++-9-dev
+      # Remove GCC 9 and clang-format 10 (installed by default)
+      run: sudo apt-get purge -y gcc-9 g++-9 libstdc++-9-dev clang-format-10
     - name: Install dependencies
       # These packages are already part of the ubuntu-20.04 image:
-      # clang-format-10 cmake gcc-10 g++-10 shellcheck libgmp-dev
+      # cmake gcc-10 g++-10 shellcheck libgmp-dev
       # These aren't:
-      run: sudo apt-get install libstdc++-10-dev libmpfr-dev libmpc-dev ninja-build npm
+      run: |
+        wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+        sudo add-apt-repository "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-11 main"
+        sudo apt-get update
+        sudo apt-get install clang-format-11 libstdc++-10-dev libmpfr-dev libmpc-dev ninja-build npm
       # If we ever do any qemu-emulation on Github Actions, we should re-enable this:
       # e2fsprogs qemu-system-i386 qemu-utils
     - name: Install prettier
@@ -35,7 +39,7 @@ jobs:
     - name: Use GCC 10 instead
       run: sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-10 60 --slave /usr/bin/g++ g++ /usr/bin/g++-10
     - name: Check versions
-      run: set +e; g++ --version; g++-10 --version; clang-format --version; clang-format-10 --version; prettier --version; python --version; python3 --version; ninja --version
+      run: set +e; g++ --version; g++-10 --version; clang-format --version; clang-format-11 --version; prettier --version; python --version; python3 --version; ninja --version
 
     # === PREPARE FOR BUILDING ===
 

CONTRIBUTING.md

@@ -34,7 +34,7 @@ Nobody is perfect, and sometimes we mess things up. That said, here are some goo
 **Do:**
 
 * Write in idiomatic Serenity C++20, using the `AK` containers in all code.
-* Conform to the project coding style found in [CodingStyle.md](https://github.com/SerenityOS/serenity/blob/master/Documentation/CodingStyle.md). Please use `clang-format` (version 10 or later) to automatically format C++ files.
+* Conform to the project coding style found in [CodingStyle.md](https://github.com/SerenityOS/serenity/blob/master/Documentation/CodingStyle.md). Please use `clang-format` (version 11 or later) to automatically format C++ files.
 * Choose expressive variable, function and class names. Make it as obvious as possible what the code is doing.
 * Split your changes into separate, atomic commits.
 * Make sure your commits are rebased on the master branch.

Documentation/BuildInstructions.md

@@ -32,7 +32,7 @@ apt-get install curl cmake libmpc-devel gmp-devel e2fsprogs libmpfr-devel patch
 
 Ensure your gcc version is >= 10 with `gcc --version`. Otherwise, install it.
 
-On Ubuntu it's in the repositories of 20.04 (Focal) - add the `ubuntu-toolchain-r/test` PPA if you're running an older version:
+On Ubuntu it's in the repositories of 20.04 (Focal) and later - add the `ubuntu-toolchain-r/test` PPA if you're running an older version:
 ```bash
 sudo add-apt-repository ppa:ubuntu-toolchain-r/test
 ```

Documentation/CodingStyle.md

@@ -2,7 +2,7 @@
 
 For low-level styling (spaces, parentheses, brace placement, etc), all code should follow the format specified in `.clang-format` in the project root.
 
-**Important: Make sure you use `clang-format` version 10 or later!**
+**Important: Make sure you use `clang-format` version 11 or later!**
 
 This document describes the coding style used for C++ code in the Serenity Operating System project. All new code should conform to this style.
 

Documentation/UsingQtCreator.md

@@ -21,7 +21,7 @@ Qt Creator should be set up correctly now, go ahead and explore the project and
 
 ## Auto-Formatting
 
-You can use `clang-format` to help you with the [style guide](https://github.com/SerenityOS/serenity/blob/master/Documentation/CodingStyle.md). Before you proceed, check that you're actually using clang-format version 10, as some OSes still ship clang-format version 9 by default.
+You can use `clang-format` to help you with the [style guide](https://github.com/SerenityOS/serenity/blob/master/Documentation/CodingStyle.md). Before you proceed, check that you're actually using clang-format version 11, as some OSes still ship clang-format version 9 or 10 by default.
 
 - In QtCreator, go to "Help > About Plugins…"
 - Find the `Beautifier (experimental)` row (for example, by typing `beau` into the search)

Meta/lint-clang-format.sh

@@ -6,17 +6,17 @@ script_path=$(cd -P -- "$(dirname -- "$0")" && pwd -P)
 cd "${script_path}/.." || exit 1
 
 CLANG_FORMAT=false
-if command -v clang-format-10 >/dev/null 2>&1 ; then
-    CLANG_FORMAT=clang-format-10
+if command -v clang-format-11 >/dev/null 2>&1 ; then
+    CLANG_FORMAT=clang-format-11
 elif command -v clang-format >/dev/null 2>&1 ; then
     CLANG_FORMAT=clang-format
-    if ! "${CLANG_FORMAT}" --version | grep -qF ' 10.' ; then
-        echo "You are using '$("${CLANG_FORMAT}" --version)', which appears to not be clang-format 10."
+    if ! "${CLANG_FORMAT}" --version | grep -qF ' 11.' ; then
+        echo "You are using '$("${CLANG_FORMAT}" --version)', which appears to not be clang-format 11."
         echo "It is very likely that the resulting changes are not what you wanted."
     fi
 else
-    echo "clang-format-10 is not available. Either skip this script, or install clang-format-10."
-    echo "(If you install a package 'clang-format', please make sure it's version 10.)"
+    echo "clang-format-10 is not available. Either skip this script, or install clang-format-11."
+    echo "(If you install a package 'clang-format', please make sure it's version 11.)"
     exit 1
 fi