build: external include directories are relocatable

Author: alandefreitas

.github/workflows/ci.yml

@@ -209,6 +209,19 @@ jobs:
           fi
           echo -E "llvm-root=$llvm_root" >> $GITHUB_OUTPUT
 
+      - name: Resolve Third-Party Directory
+        id: resolve-third-party-dir
+        run: |          
+          set -x
+          cd ..
+          third_party_dir=$(pwd)/third-party
+          if [[ ${{ runner.os }} == 'Windows' ]]; then
+              third_party_dir=$(echo "$third_party_dir" | sed 's/\\/\//g')
+              third_party_dir=$(echo $third_party_dir | sed 's|^/d/|D:/|')
+              echo "$third_party_dir"
+          fi
+          echo -E "third-party-dir=$third_party_dir" >> $GITHUB_OUTPUT
+
       - name: Cached LLVM Binaries
         id: llvm-cache
         uses: actions/cache@v4
@@ -365,10 +378,10 @@ jobs:
           install-prefix: .local
           extra-args: |
             -D MRDOCS_BUILD_DOCS=OFF
-            -D LLVM_ROOT=../third-party/llvm-project/install
-            -D Clang_ROOT=../third-party/llvm-project/install
-            -D duktape_ROOT=../third-party/duktape/install
-            -D Duktape_ROOT=../third-party/duktape/install
+            -D LLVM_ROOT=${{ steps.resolve-third-party-dir.outputs.third-party-dir }}/llvm-project/install
+            -D Clang_ROOT=${{ steps.resolve-third-party-dir.outputs.third-party-dir }}/llvm-project/install
+            -D duktape_ROOT=${{ steps.resolve-third-party-dir.outputs.third-party-dir }}/duktape/install
+            -D Duktape_ROOT=${{ steps.resolve-third-party-dir.outputs.third-party-dir }}/duktape/install
             ${{ runner.os == 'Windows' && '-D libxml2_ROOT=../third-party/libxml2/install' || '' }}
             ${{ runner.os == 'Windows' && '-D LibXml2_ROOT=../third-party/libxml2/install' || '' }}
           export-compile-commands: true

CMakeLists.txt

@@ -224,9 +224,17 @@ target_compile_definitions(
 )
 
 # Dependencies
-target_include_directories(mrdocs-core SYSTEM PUBLIC ${LLVM_INCLUDE_DIRS})
-target_include_directories(mrdocs-core SYSTEM PUBLIC ${CLANG_INCLUDE_DIRS})
-target_include_directories(mrdocs-core SYSTEM PRIVATE ${DUKTAPE_INCLUDE_DIRS})
+target_include_directories(mrdocs-core
+        SYSTEM PUBLIC
+        $<BUILD_INTERFACE:${LLVM_INCLUDE_DIRS}>
+        $<BUILD_INTERFACE:${CLANG_INCLUDE_DIRS}>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
+target_include_directories(mrdocs-core
+        SYSTEM PRIVATE
+        $<BUILD_INTERFACE:${DUKTAPE_INCLUDE_DIRS}>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
 target_link_libraries(mrdocs-core PRIVATE ${DUKTAPE_LIBRARY})
 
 # Clang