fix: don't override ccache's default cache_dir

PROBLEM: Setting cache_dir='~/.ccache' explicitly stores the
LITERAL tilde in ccache.conf, which might not expand properly.

SOLUTION: Don't set cache_dir at all - let ccache use its default
- Linux default: ~/.ccache
- ccache will expand the tilde correctly when using default
- Only configure max_size, hash_dir, compiler_check
- Remove CCACHE_DIR env var (not needed with default)

This should fix the issue where ccache runs but creates no cache files.

.github/actions/xahau-configure-ccache/action.yml

@@ -25,17 +25,18 @@ runs:
     - name: Configure ccache
       shell: bash
       run: |
-        # Create cache directory
-        mkdir -p ${{ inputs.cache_dir }}
+        # Use ccache's default cache_dir (~/.ccache) - don't override it
+        # This avoids tilde expansion issues when setting it explicitly
 
-        # Configure ccache settings
-        ccache --set-config=cache_dir="${{ inputs.cache_dir }}"
+        # Create cache directory using ccache's default
+        mkdir -p ~/.ccache
+
+        # Configure ccache settings (but NOT cache_dir - use default)
         ccache --set-config=max_size=${{ inputs.max_size }}
         ccache --set-config=hash_dir=${{ inputs.hash_dir }}
         ccache --set-config=compiler_check=${{ inputs.compiler_check }}
 
-        # Export for use by build tools
-        echo "CCACHE_DIR=${{ inputs.cache_dir }}" >> $GITHUB_ENV
+        # Note: Not setting CCACHE_DIR - let ccache use its default (~/.ccache)
 
         # Print config for verification
         ccache -p

.github/actions/xahau-ga-build/action.yml

@@ -93,14 +93,27 @@ runs:
         if [ -n "${{ inputs.cxx }}" ]; then
           export CXX="${{ inputs.cxx }}"
         fi
-        
-        
-        # Configure ccache launcher args
-        CCACHE_ARGS=""
+
+        # Create wrapper toolchain that overlays ccache on top of Conan's toolchain
+        # This enables ccache for the main app build without affecting Conan dependency builds
         if [ "${{ inputs.ccache_enabled }}" = "true" ]; then
-          CCACHE_ARGS="-DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache"
+          cat > wrapper_toolchain.cmake <<'EOF'
+        # Include Conan's generated toolchain first (sets compiler, flags, etc.)
+        # Note: CMAKE_CURRENT_LIST_DIR is the directory containing this wrapper (.build/)
+        include(${CMAKE_CURRENT_LIST_DIR}/build/generators/conan_toolchain.cmake)
+
+        # Overlay ccache configuration for main application build
+        # This does NOT affect Conan dependency builds (already completed)
+        set(CMAKE_C_COMPILER_LAUNCHER ccache CACHE STRING "C compiler launcher" FORCE)
+        set(CMAKE_CXX_COMPILER_LAUNCHER ccache CACHE STRING "C++ compiler launcher" FORCE)
+        EOF
+          TOOLCHAIN_FILE="wrapper_toolchain.cmake"
+          echo "✅ Created wrapper toolchain with ccache enabled"
+        else
+          TOOLCHAIN_FILE="build/generators/conan_toolchain.cmake"
+          echo "ℹ️  Using Conan toolchain directly (ccache disabled)"
         fi
-        
+
         # Configure C++ standard library if specified
         # libstdcxx used for clang-14/16 to work around missing lexicographical_compare_three_way in libc++
         # libcxx can be used with clang-17+ which has full C++20 support
@@ -140,16 +153,34 @@ runs:
         # So we get: .build/build/generators/ with our non-standard folder name
         cmake .. \
           -G "${{ inputs.generator }}" \
-          $CCACHE_ARGS \
           ${CMAKE_CXX_FLAGS:+-DCMAKE_CXX_FLAGS="$CMAKE_CXX_FLAGS"} \
-          -DCMAKE_TOOLCHAIN_FILE:FILEPATH=build/generators/conan_toolchain.cmake \
+          -DCMAKE_TOOLCHAIN_FILE:FILEPATH=${TOOLCHAIN_FILE} \
           -DCMAKE_BUILD_TYPE=${{ inputs.configuration }}
 
     - name: Build project
       shell: bash
       run: |
         cd ${{ inputs.build_dir }}
-        cmake --build . --config ${{ inputs.configuration }} --parallel $(nproc)
+        # TEMPORARY: Add -v to see compile commands for ccache debugging
+        cmake --build . --config ${{ inputs.configuration }} --parallel $(nproc) -- -v
+
+    - name: Debug ccache directory
+      if: inputs.ccache_enabled == 'true'
+      shell: bash
+      run: |
+        echo "=== ccache directory contents ==="
+        ls -laR ~/.ccache || echo "Directory doesn't exist"
+        echo ""
+        echo "=== Disk space ==="
+        df -h ~
+        echo ""
+        echo "=== ccache config ==="
+        ccache --show-config | head -30
+        echo ""
+        echo "=== Directory sizes ==="
+        du -sh ~/.ccache 2>/dev/null || echo "No directory"
+        find ~/.ccache -type f -name "*.conf" -o -type f ! -name "*.conf" 2>/dev/null | head -20 || true
+        echo ""
 
     - name: Show ccache statistics
       if: inputs.ccache_enabled == 'true'

.github/actions/xahau-ga-dependencies/action.yml

@@ -25,6 +25,28 @@ inputs:
     description: 'Main branch name for restore keys'
     required: false
     default: 'dev'
+  os:
+    description: 'Operating system (Linux, Macos)'
+    required: false
+    default: 'Linux'
+  arch:
+    description: 'Architecture (x86_64, armv8)'
+    required: false
+    default: 'x86_64'
+  compiler:
+    description: 'Compiler type (gcc, clang, apple-clang)'
+    required: true
+  compiler_version:
+    description: 'Compiler version (11, 13, 14, etc.)'
+    required: true
+  cc:
+    description: 'C compiler executable (gcc-13, clang-14, etc.), empty for macOS'
+    required: false
+    default: ''
+  cxx:
+    description: 'C++ compiler executable (g++-14, clang++-14, etc.), empty for macOS'
+    required: false
+    default: ''
   stdlib:
     description: 'C++ standard library for Conan configuration (note: also in compiler-id)'
     required: true
@@ -63,6 +85,58 @@ runs:
         aws-access-key-id: ${{ inputs.aws-access-key-id }}
         aws-secret-access-key: ${{ inputs.aws-secret-access-key }}
 
+    - name: Configure Conan
+      shell: bash
+      run: |
+        # Create the default profile directory if it doesn't exist
+        mkdir -p ~/.conan2/profiles
+
+        # Determine the correct libcxx based on stdlib parameter
+        if [ "${{ inputs.stdlib }}" = "libcxx" ]; then
+          LIBCXX="libc++"
+        else
+          LIBCXX="libstdc++11"
+        fi
+
+        # Create profile with our specific settings
+        # This overwrites any cached profile to ensure fresh configuration
+        cat > ~/.conan2/profiles/default <<EOF
+        [settings]
+        arch=${{ inputs.arch }}
+        build_type=${{ inputs.configuration }}
+        compiler=${{ inputs.compiler }}
+        compiler.cppstd=20
+        compiler.libcxx=${LIBCXX}
+        compiler.version=${{ inputs.compiler_version }}
+        os=${{ inputs.os }}
+        EOF
+
+        # Add buildenv and conf sections for Linux (not needed for macOS)
+        if [ "${{ inputs.os }}" = "Linux" ] && [ -n "${{ inputs.cc }}" ]; then
+          cat >> ~/.conan2/profiles/default <<EOF
+
+        [buildenv]
+        CC=/usr/bin/${{ inputs.cc }}
+        CXX=/usr/bin/${{ inputs.cxx }}
+
+        [conf]
+        tools.build:compiler_executables={"c": "/usr/bin/${{ inputs.cc }}", "cpp": "/usr/bin/${{ inputs.cxx }}"}
+        EOF
+        fi
+
+        # Add macOS-specific conf if needed
+        if [ "${{ inputs.os }}" = "Macos" ]; then
+          cat >> ~/.conan2/profiles/default <<EOF
+
+        [conf]
+        # Workaround for gRPC with newer Apple Clang
+        tools.build:cxxflags=["-Wno-missing-template-arg-list-after-template-kw"]
+        EOF
+        fi
+
+        # Display profile for verification
+        conan profile show
+
     - name: Export custom recipes
       shell: bash
       run: |

.github/workflows/xahau-ga-macos.yml.disabled

@@ -98,32 +98,12 @@ jobs:
           echo "---- Full Environment ----"
           env
 
-      - name: Configure Conan
+      - name: Detect compiler version
+        id: detect-compiler
         run: |
-          # Create the default profile directory if it doesn't exist
-          mkdir -p ~/.conan2/profiles
-
-          # Detect compiler version
           COMPILER_VERSION=$(clang --version | grep -oE 'version [0-9]+' | grep -oE '[0-9]+')
-
-          # Create profile with our specific settings
-          cat > ~/.conan2/profiles/default <<EOF
-          [settings]
-          arch=armv8
-          build_type=Release
-          compiler=apple-clang
-          compiler.cppstd=20
-          compiler.libcxx=libc++
-          compiler.version=${COMPILER_VERSION}
-          os=Macos
-
-          [conf]
-          # Workaround for gRPC with newer Apple Clang
-          tools.build:cxxflags=["-Wno-missing-template-arg-list-after-template-kw"]
-          EOF
-
-          # Display profile for verification
-          conan profile show
+          echo "compiler_version=${COMPILER_VERSION}" >> $GITHUB_OUTPUT
+          echo "Detected Apple Clang version: ${COMPILER_VERSION}"
 
       - name: Install dependencies
         uses: ./.github/actions/xahau-ga-dependencies
@@ -133,6 +113,13 @@ jobs:
           compiler-id: clang
           cache_version: ${{ env.CACHE_VERSION }}
           main_branch: ${{ env.MAIN_BRANCH_NAME }}
+          os: Macos
+          arch: armv8
+          compiler: apple-clang
+          compiler_version: ${{ steps.detect-compiler.outputs.compiler_version }}
+          stdlib: libcxx
+          aws-access-key-id: ${{ secrets.XAHAUD_GITHUB_ACTIONS_CACHE_NIQ_AWS_KEY_ID }}
+          aws-secret-access-key: ${{ secrets.XAHAUD_GITHUB_ACTIONS_CACHE_NIQ_AWS_ACCESS_KEY }}
 
       - name: Build
         uses: ./.github/actions/xahau-ga-build

.github/workflows/xahau-ga-nix.yml

@@ -238,40 +238,6 @@ jobs:
           hash_dir: true
           compiler_check: content
 
-      - name: Configure Conan
-        run: |
-          # Create the default profile directory if it doesn't exist
-          mkdir -p ~/.conan2/profiles
-
-          # Determine the correct libcxx based on stdlib parameter
-          if [ "${{ matrix.stdlib }}" = "libcxx" ]; then
-            LIBCXX="libc++"
-          else
-            LIBCXX="libstdc++11"
-          fi
-
-          # Create profile with our specific settings
-          cat > ~/.conan2/profiles/default <<EOF
-          [settings]
-          arch=x86_64
-          build_type=${{ matrix.configuration }}
-          compiler=${{ matrix.compiler }}
-          compiler.cppstd=20
-          compiler.libcxx=${LIBCXX}
-          compiler.version=${{ matrix.compiler_version }}
-          os=Linux
-
-          [buildenv]
-          CC=/usr/bin/${{ matrix.cc }}
-          CXX=/usr/bin/${{ matrix.cxx }}
-
-          [conf]
-          tools.build:compiler_executables={"c": "/usr/bin/${{ matrix.cc }}", "cpp": "/usr/bin/${{ matrix.cxx }}"}
-          EOF
-
-          # Display profile for verification
-          conan profile show
-
       - name: Check environment
         run: |
           echo "PATH:"
@@ -292,6 +258,10 @@ jobs:
           compiler-id: ${{ matrix.compiler_id }}
           cache_version: ${{ env.CACHE_VERSION }}
           main_branch: ${{ env.MAIN_BRANCH_NAME }}
+          compiler: ${{ matrix.compiler }}
+          compiler_version: ${{ matrix.compiler_version }}
+          cc: ${{ matrix.cc }}
+          cxx: ${{ matrix.cxx }}
           stdlib: ${{ matrix.stdlib }}
           aws-access-key-id: ${{ secrets.XAHAUD_GITHUB_ACTIONS_CACHE_NIQ_AWS_KEY_ID }}
           aws-secret-access-key: ${{ secrets.XAHAUD_GITHUB_ACTIONS_CACHE_NIQ_AWS_ACCESS_KEY }}