Add generation of Doxygen documentation

.github/workflows/check.yml

@@ -37,3 +37,24 @@ jobs:
 
   cppcheck:
     uses: ./.github/workflows/cppcheck.yml
+
+  doxygen:
+    runs-on: ubuntu-latest
+    container: oraclelinux:9
+    steps:
+    - name: Check out repository code
+      uses: actions/checkout@v4
+    - name: Install dependencies
+      uses: ./.github/actions/install-dependencies
+    - name: Install doxygen
+      run: |
+        dnf config-manager --set-enabled ol9_codeready_builder
+        dnf install -y doxygen
+    - name: make doxygen
+      run: make doxygen
+    - name: upload Doxygen artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: doxygen
+        path: ./build/doc/doxygen/html
+        retention-days: 7

CMakeLists.txt

@@ -14,6 +14,7 @@ option(TELEMETRY_BUILD_SHARED "Build shared library" ON)
 option(TELEMETRY_PACKAGE_BUILDER "Enable RPM package builder (make rpm)" ON)
 option(TELEMETRY_INSTALL_TARGETS "Generate the install target" ON)
 option(TELEMETRY_ENABLE_TESTS "Build Unit tests (make test)" OFF)
+option(TELEMETRY_ENABLE_DOC_DOXYGEN "Enable build of code documentation" OFF)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
@@ -40,6 +41,7 @@ if (TELEMETRY_ENABLE_TESTS)
 endif()
 
 add_subdirectory(src)
+add_subdirectory(doc)
 
 if (TELEMETRY_PACKAGE_BUILDER)
 	add_subdirectory(pkg)

Makefile

@@ -72,3 +72,6 @@ test: build
 	@$(MAKE) --no-print-directory -C build
 	@$(MAKE) test --no-print-directory -C build
 
+doxygen: build
+	@cd build && $(CMAKE) $(CMAKE_ARGS) -DTELEMETRY_ENABLE_DOC_DOXYGEN=ON ..
+	@$(MAKE) --no-print-directory -C build $@

doc/CMakeLists.txt

@@ -0,0 +1,3 @@
+if (TELEMETRY_ENABLE_DOC_DOXYGEN)
+	add_subdirectory(doxygen)
+endif()

doc/doxygen/CMakeLists.txt

@@ -0,0 +1,21 @@
+find_package(Doxygen REQUIRED)
+
+set(DOXYGEN_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/")
+
+if (NOT DOXYGEN_WARN_AS_ERROR)
+	set(DOXYGEN_WARN_AS_ERROR "NO")
+endif()
+
+configure_file(
+	"${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in"
+	"${DOXYGEN_DIRECTORY}/Doxyfile"
+	@ONLY
+)
+
+add_custom_target(
+	doxygen
+	COMMAND ${DOXYGEN_EXECUTABLE} Doxyfile
+	WORKING_DIRECTORY "${DOXYGEN_DIRECTORY}"
+	COMMENT "Generating API documentation with Doxygen to ${DOXYGEN_DIRECTORY}"
+	VERBATIM
+)