Fix macos-15 ci cling job

Define ARCHITECHURE=$(uname -m) to pick compiler correctly on osx15 (ci)

Install llvm15 to compile CppInterOp on osx15 cling jobs

Remove llvm 18 ci osx15 cling job

Try cleanup of brew

Try switching to Xcode 15.4 osx15 cling ci job

Add sudo to Xcode-select ci

Update ci.yml

Update ci.yml

Update ci.yml

Update ci.yml

Update ci.yml

Update ci.yml

Debug

Debug

Update ci.yml

Update ci.yml

Update ci.yml

Update ci.yml

Author: mcbarton

.github/workflows/ci.yml

@@ -291,15 +291,31 @@ jobs:
           echo "CC=gcc-${vers}" >> $GITHUB_ENV
           echo "CXX=g++-${vers}" >> $GITHUB_ENV
         else
-          echo "SDKROOT=$(xcrun --sdk macosx --show-sdk-path)" >> $GITHUB_ENV
+          export ARCHITECHURE=$(uname -m)
           if [[ "$ARCHITECHURE" == "arm64" ]]; then
-            echo "CC=$(brew --prefix llvm@18)/bin/clang" >> $GITHUB_ENV
-            echo "CXX=$(brew --prefix llvm@18)/bin/clang++" >> $GITHUB_ENV
+            cling_on=$(echo "${{ matrix.cling }}" | tr '[:lower:]' '[:upper:]')
+            if [[ "${cling_on}" == "ON" ]]; then  
+                brew install llvm@15
+                brew remove llvm@18
+                brew cleanup
+                #FIXME: Do not believe setting all these environment variables are necessary
+                #       They were set to avoid using Xcodes libc++ and to stop CppInterOp using llvm@18 in tests
+                echo 'LDFLAGS="-L/opt/homebrew/opt/llvm@15/lib/ -L/opt/homebrew/opt/llvm@15/c++/"' >> $GITHUB_ENV
+                echo 'CPPFLAGS="-I/opt/homebrew/opt/llvm@15/include"' >> $GITHUB_ENV
+                echo 'CPATH="/opt/homebrew/include/"' >> $GITHUB_ENV
+                echo 'LIBRARY_PATH="/opt/homebrew/lib/"' >> $GITHUB_ENV
+                echo "CC=$(brew --prefix llvm@15)/bin/clang" >> $GITHUB_ENV
+                echo "CXX=$(brew --prefix llvm@15)/bin/clang++" >> $GITHUB_ENV
+            else
+              echo "CC=$(brew --prefix llvm@18)/bin/clang" >> $GITHUB_ENV
+              echo "CXX=$(brew --prefix llvm@18)/bin/clang++" >> $GITHUB_ENV
+            fi
           else
             echo "CC=$(brew --prefix llvm@15)/bin/clang" >> $GITHUB_ENV
             echo "CXX=$(brew --prefix llvm@15)/bin/clang++" >> $GITHUB_ENV
           fi
         fi
+        echo "SDKROOT=$(xcrun --sdk macosx --show-sdk-path)" >> $GITHUB_ENV
       env:
         compiler: ${{ matrix.compiler }}
 
@@ -764,9 +780,25 @@ jobs:
           echo "CXX=g++-${vers}" >> $GITHUB_ENV
         else
           echo "SDKROOT=$(xcrun --sdk macosx --show-sdk-path)" >> $GITHUB_ENV
+          export ARCHITECHURE=$(uname -m)
           if [[ "$ARCHITECHURE" == "arm64" ]]; then
-            echo "CC=$(brew --prefix llvm@18)/bin/clang" >> $GITHUB_ENV
-            echo "CXX=$(brew --prefix llvm@18)/bin/clang++" >> $GITHUB_ENV
+            cling_on=$(echo "${{ matrix.cling }}" | tr '[:lower:]' '[:upper:]')
+            if [[ "${cling_on}" == "ON" ]]; then  
+                brew install llvm@15
+                brew remove llvm@18
+                brew cleanup
+                #FIXME: Do not believe setting all these environment variables are necessary
+                #       They were set to avoid using Xcodes libc++ and to stop CppInterOp using llvm@18 in tests
+                echo 'LDFLAGS="-L/opt/homebrew/opt/llvm@15/lib/ -L/opt/homebrew/opt/llvm@15/c++/"' >> $GITHUB_ENV
+                echo 'CPPFLAGS="-I/opt/homebrew/opt/llvm@15/include"' >> $GITHUB_ENV
+                echo 'CPATH="/opt/homebrew/include/"' >> $GITHUB_ENV
+                echo 'LIBRARY_PATH="/opt/homebrew/lib/"' >> $GITHUB_ENV
+                echo "CC=$(brew --prefix llvm@15)/bin/clang" >> $GITHUB_ENV
+                echo "CXX=$(brew --prefix llvm@15)/bin/clang++" >> $GITHUB_ENV
+            else
+              echo "CC=$(brew --prefix llvm@18)/bin/clang" >> $GITHUB_ENV
+              echo "CXX=$(brew --prefix llvm@18)/bin/clang++" >> $GITHUB_ENV
+            fi
           else
             echo "CC=$(brew --prefix llvm@15)/bin/clang" >> $GITHUB_ENV
             echo "CXX=$(brew --prefix llvm@15)/bin/clang++" >> $GITHUB_ENV