Merge pull request #586 from elbeno/revert-clang18-libcpp-removal

👷 Reinstate clang-18 libc++ in CI

Author: lukevalenty

.github/workflows/unit_tests.yml

@@ -40,6 +40,11 @@ jobs:
             compiler: clang
             install: wget https://apt.llvm.org/llvm.sh && chmod +x llvm.sh && sudo ./llvm.sh 18
             toolchain_root: "/usr/lib/llvm-18"
+          - version: 18
+            compiler: clang
+            stdlib: libc++
+            install: wget https://apt.llvm.org/llvm.sh && chmod +x llvm.sh && sudo ./llvm.sh 18 && sudo apt install -y libc++-18-dev libc++abi-18-dev
+            cxx_flags: "-stdlib=libc++"
           - version: 17
             compiler: clang
             install: wget https://apt.llvm.org/llvm.sh && chmod +x llvm.sh && sudo ./llvm.sh 17
@@ -91,9 +96,6 @@ jobs:
             cxx: "g++-12"
             cxx_flags: ""
         exclude:
-          - compiler: clang
-            version: 18
-            stdlib: libc++
           - compiler: gcc
             version: 18
           - compiler: gcc