Add WITH_CLANG-TIDY to CMake recipe.

CMakeLists.txt

@@ -22,6 +22,7 @@ option(WITH_TESTS "Compile tests." NO)
 option(WITH_EXAMPLES "Compile examples." NO)
 option(WITH_DEB "Prepare for the building of .deb packages." NO)
 option(WITH_RPM "Prepare for the building of .rpm packages." NO)
+option(WITH_CLANG-TIDY "Check sourcecode with clang-tidy while compiling." NO)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
@@ -29,6 +30,12 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 
 include(debug_flags)
 
+if(WITH_CLANG-TIDY)
+  set(CMAKE_CXX_CLANG_TIDY
+    "clang-tidy"
+    "-p=build"
+    "-header-filter=${PROJECT_SOURCE_DIR}"
+    "-quiet")
 endif()
 
 add_subdirectory(src)

README.adoc

@@ -16,6 +16,7 @@
 :uri-rpm-build: http://www.rpm.org
 :uri-libcurl: https://curl.haxx.se/libcurl/
 :uri-nodeinfo: https://nodeinfo.diaspora.software/
+:uri-clang-tidy: https://clang.llvm.org/extra/clang-tidy/
 
 *{project}* is a C++ wrapper for the link:{uri-wp-mastodon}[Mastodon] and
 link:{uri-pleroma}[Pleroma] APIs. It replaces
@@ -150,6 +151,8 @@ cmake --build . -- -j$(nproc --ignore=1)
 * `-DCMAKE_BUILD_TYPE=Debug` for a debug build.
 * `-DWITH_TESTS=YES` if you want to compile the tests.
 * `-DWITH_EXAMPLES=YES` if you want to compile the examples.
+* `-DWITH_CLANG-TIDY=YES` to check the sourcecode with
+  link:{uri-clang-tidy}[clang-tidy] while compiling.
 * One of:
   ** `-DWITH_DEB=YES` if you want to be able to generate a deb-package.
   ** `-DWITH_RPM=YES` if you want to be able to generate an rpm-package.