Add Windows ClangCL

Author: toroidal-code

.github/workflows/test.yml

@@ -20,7 +20,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-13, macos-15]
         exclude:
           - os: windows-latest
-            compiler: llvm-18
+            compiler: gcc-14
           - os: macos-13
             compiler: native # AppleClang is too old
 
@@ -32,12 +32,12 @@ jobs:
         uses: lukka/get-cmake@latest
 
       - name: Install Clang
-        if: ${{ matrix.compiler == 'llvm-18' && (matrix.os == 'macos-13' || matrix.os == 'macos-15') }}
         run: |
           brew install llvm@18
           brew link --force --overwrite llvm@18
           echo "CC=$(brew --prefix llvm@18)/bin/clang" >> $GITHUB_ENV
           echo "CXX=$(brew --prefix llvm@18)/bin/clang++" >> $GITHUB_ENV
+        if: ${{ matrix.compiler == 'llvm-18' && (matrix.os == 'macos-13' || matrix.os == 'macos-15') }}
 
       - name: Use LLVM and Clang
         run: |
@@ -53,6 +53,11 @@ jobs:
 
       - name: Configure
         run: cmake -B build -DCPPSPEC_BUILD_TESTS=YES
+        if: ${{ matrix.compiler != 'llvm-18' || matrix.os != 'windows-latest' }}
+
+      - name: Configure ClangCL
+        run: cmake -B build -DCPPSPEC_BUILD_TESTS=YES -G "Visual Studio 17 2022" -T ClangCL
+        if: ${{ matrix.compiler == 'llvm-18' && matrix.os == 'windows-latest' }}
 
       - name: Build
         run: cmake --build build --config Release

README.md

@@ -1,4 +1,4 @@
-# C++Spec 
+# C++Spec
 [![license](https://img.shields.io/badge/license-MIT-blue)](https://choosealicense.com/licenses/mit/)
 [![GitHub Action](https://github.com/toroidal-code/cppspec/actions/workflows/test.yml/badge.svg)]() 
 [![GitHub release](https://img.shields.io/github/release/toroidal-code/cppspec.svg)](https://github.com/toroidal-code/cppspec/releases/latest) 
@@ -12,9 +12,13 @@ See [http://cppspec.readthedocs.org/](http://cppspec.readthedocs.org/) for full
 
 ## Requirements
 
-C++Spec requires a compiler and standard library with support for C++20.
+C++Spec requires a compiler and standard library with support for C++23: Currently tested and confirmed working are:
+- LLVM/Clang 18 (on Linux, macOS, and Windows)
+- GCC 14.2 (on Linux and macOS)
+- MSVC 19.43 (on Windows)
+- AppleClang 16 (on macOS)
 
-__Note:__ Only the tests require being compiled with C++20 support (`-std=c++20`). No other part of an existing project's build must be modified.
+__Note:__ Only the tests require being compiled with C++23 support (`-std=c++23`). No other part of an existing project's build must be modified.
 
 ## Usage
 The recommended usage is as a subproject integrated into your build system. For CMake this would look something like below: