From 9cd01615f558e0512ebc2a683a09546fcc457599 Mon Sep 17 00:00:00 2001
From: Sebastian Pipping <sebastian@pipping.org>
Date: Mon, 20 Nov 2023 15:15:24 +0100
Subject: [PATCH] CI: Cover build on macOS

---
 .../{linux.yml => linux_and_macos.yml}        | 26 ++++++++++++++++---
 1 file changed, 22 insertions(+), 4 deletions(-)
 rename .github/workflows/{linux.yml => linux_and_macos.yml} (69%)

diff --git a/.github/workflows/linux.yml b/.github/workflows/linux_and_macos.yml
similarity index 69%
rename from .github/workflows/linux.yml
rename to .github/workflows/linux_and_macos.yml
index fc5a04b..65e9b82 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux_and_macos.yml
@@ -1,7 +1,7 @@
 # Copyright (c) 2023 Sebastian Pipping <sebastian@pipping.org>
 # Licensed under Apache License Version 2.0
 
-name: Build on Linux
+name: Build on Linux/macOS
 
 # Drop permissions to minimum, for security
 permissions:
@@ -16,7 +16,7 @@ on:
 
 jobs:
   linux:
-    name: Build (${{ matrix.cc }})
+    name: Build (${{ matrix.cc }} on ${{ matrix.runs-on }})
     runs-on: ${{ matrix.runs-on }}
     strategy:
       fail-fast: false
@@ -37,9 +37,19 @@ jobs:
             clang_major_version: 18
             clang_repo_suffix:
             runs-on: ubuntu-22.04
+          - cc: gcc-13
+            cxx: g++-13
+            clang_major_version: null
+            clang_repo_suffix: null
+            runs-on: macos-12
+          - cc: clang-15
+            cxx: clang++-15
+            clang_major_version: 15
+            clang_repo_suffix: null
+            runs-on: macos-12
     steps:
       - name: Add Clang/LLVM repositories
-        if: "${{ contains(matrix.cxx, 'clang') }}"
+        if: "${{ runner.os == 'Linux' && contains(matrix.cxx, 'clang') }}"
         run: |-
           set -x
           source /etc/os-release
@@ -47,6 +57,7 @@ jobs:
           sudo add-apt-repository "deb http://apt.llvm.org/${UBUNTU_CODENAME}/ llvm-toolchain-${UBUNTU_CODENAME}${{ matrix.clang_repo_suffix }} main"
 
       - name: Install build dependencies
+        if: "${{ runner.os == 'Linux' }}"
         run: |-
           sudo apt-get update
           sudo apt-get install --yes --no-install-recommends \
@@ -54,11 +65,18 @@ jobs:
             pkg-config
 
       - name: Install build dependency Clang ${{ matrix.clang_major_version }}
-        if: "${{ contains(matrix.cxx, 'clang') }}"
+        if: "${{ runner.os == 'Linux' && contains(matrix.cxx, 'clang') }}"
         run: |-
           sudo apt-get install --yes --no-install-recommends -V \
               clang-${{ matrix.clang_major_version }}
 
+      - name: Add versioned aliases for Clang ${{ matrix.clang_major_version }}
+        if: "${{ runner.os == 'macOS' && contains(matrix.cxx, 'clang') }}"
+        run: |-
+          set -x
+          sudo ln -s "$(brew --prefix llvm@${{ matrix.clang_major_version }})"/bin/clang   /usr/local/bin/clang-${{ matrix.clang_major_version }}
+          sudo ln -s "$(brew --prefix llvm@${{ matrix.clang_major_version }})"/bin/clang++ /usr/local/bin/clang++-${{ matrix.clang_major_version }}
+
       - name: Checkout Git branch
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1