[CMake] Add 'docs' target

Author: lukaszstolarczuk

.github/workflows/docs.yml

@@ -42,9 +42,8 @@ jobs:
 
     - name: Build the documentation
       run: |
-        mkdir build
-        cd build
-        python3 ../docs/generate_docs.py
+        cmake -B build -DUMF_TESTS_FAIL_ON_SKIP=ON
+        cmake --build build --target docs
 
     - name: Upload artifact
       uses: actions/upload-pages-artifact@0252fc4ba7626f0298f0cf00902a25c6afc77fa8 # v3.0.0

.github/workflows/reusable_docs_build.yml

@@ -31,6 +31,10 @@ jobs:
 
     - name: Build the documentation
       run: |
-        mkdir build
-        cd build
-        python3 ../docs/generate_docs.py
+        cmake -B build \
+          -DUMF_BUILD_LEVEL_ZERO_PROVIDER=OFF \
+          -DUMF_BUILD_CUDA_PROVIDER=OFF \
+          -DUMF_BUILD_TESTS=OFF \
+          -DUMF_BUILD_EXAMPLES=OFF \
+          -DUMF_DISABLE_HWLOC=ON
+        cmake --build build --target docs

CMakeLists.txt

@@ -755,6 +755,17 @@ if(UMF_FORMAT_CODE_STYLE)
     endif()
 endif()
 
+find_package(Python3)
+if(Python3_FOUND)
+    message(STATUS "Adding 'docs' target")
+    add_custom_target(
+        docs
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+        COMMAND ${Python3_EXECUTABLE}
+                ${UMF_CMAKE_SOURCE_DIR}/docs/generate_docs.py
+        COMMENT "Generate HTML documentation using Doxygen")
+endif()
+
 # --------------------------------------------------------------------------- #
 # Configure make install/uninstall and packages
 # --------------------------------------------------------------------------- #

docs/README.md

@@ -1,8 +1,24 @@
-To generate HTML documentation run the `generate_docs.py` script from the `build` dir.
-It will create extra `./docs_build` directory, where the intermediate and final files
+# Documentation
+
+To generate HTML documentation run the `generate_docs.py` script from any sub-dir of the
+repository (most likely `build`) or enable and use build target 'docs' (see details below).
+
+This script will create `./docs_build` sub-directory, where the intermediate and final files
 will be created. HTML docs will be in the `./docs_build/generated/html` directory.
 
-The script requires:
+## make docs
+
+To run documentation generation via build target use CMake commands below.
+To enable this target, python executable has to be found in the system.
+
+```bash
+$ cmake -B build
+$ cmake --build build --target docs
+```
+
+## Requirements
+
+Script to generate HTML docs requires:
  * [Doxygen](http://www.doxygen.nl/) at least v1.9.1
  * [Python](https://www.python.org/downloads/) at least v3.8
  * and python pip requirements, as defined in `third_party/requirements.txt`