Now it works without boost if you don't want the examples.

Author: TheSharpOwl

CMakeLists.txt

@@ -104,24 +104,6 @@ if (NOT CPPKAFKA_PKGCONFIG_DIR)
     set(CPPKAFKA_PKGCONFIG_DIR share/pkgconfig)
 endif()
 
-# Look for Boost (just need boost.optional headers here)
-find_package(Boost REQUIRED ${FIND_PACKAGE_QUIET})
-
-if (Boost_FOUND)
-    find_package(Boost COMPONENTS program_options ${FIND_PACKAGE_QUIET})
-    set(Boost_USE_STATIC_LIBS ${CPPKAFKA_BOOST_STATIC_LIBS})
-    set(Boost_USE_MULTITHREADED ${CPPKAFKA_BOOST_USE_MULTITHREADED})
-    include_directories(${Boost_INCLUDE_DIRS})
-    link_directories(${Boost_LIBRARY_DIRS})
-    if (CPPKAFKA_CMAKE_VERBOSE)
-        message(STATUS "Boost include dir: ${Boost_INCLUDE_DIRS}")
-        message(STATUS "Boost library dir: ${Boost_LIBRARY_DIRS}")
-        message(STATUS "Boost use static libs: ${Boost_USE_STATIC_LIBS}")
-        message(STATUS "Boost is multi-threaded: ${CPPKAFKA_BOOST_USE_MULTITHREADED}")
-        message(STATUS "Boost libraries: ${Boost_LIBRARIES}")
-    endif()
-endif()
-
 # Try to find the RdKafka configuration file if present.
 # This will search default system locations as well as RdKafka_ROOT and RdKafka_Dir paths if specified.
 find_package(RdKafka ${FIND_PACKAGE_QUIET} CONFIG)
@@ -142,10 +124,28 @@ add_subdirectory(src)
 add_subdirectory(include/cppkafka)
 
 # Examples target
-if (NOT CPPKAFKA_DISABLE_EXAMPLES AND Boost_PROGRAM_OPTIONS_FOUND)
-    add_subdirectory(examples)
-else()
-    message(STATUS "Disabling examples")
+if (NOT CPPKAFKA_DISABLE_EXAMPLES)
+    # Look for Boost (just need boost.optional headers here)
+    find_package(Boost ${FIND_PACKAGE_QUIET} CONFIG)
+    if (Boost_FOUND)
+        option(CPPKAFKA_BOOST_STATIC_LIBS "Link with Boost static libraries." ON)
+        option(CPPKAFKA_BOOST_USE_MULTITHREADED "Use Boost multithreaded libraries." ON)
+        find_package(Boost COMPONENTS program_options ${FIND_PACKAGE_QUIET})
+        set(Boost_USE_STATIC_LIBS ${CPPKAFKA_BOOST_STATIC_LIBS})
+        set(Boost_USE_MULTITHREADED ${CPPKAFKA_BOOST_USE_MULTITHREADED})
+        include_directories(${Boost_INCLUDE_DIRS})
+        link_directories(${Boost_LIBRARY_DIRS})
+        if (CPPKAFKA_CMAKE_VERBOSE)
+            message(STATUS "Boost include dir: ${Boost_INCLUDE_DIRS}")
+            message(STATUS "Boost library dir: ${Boost_LIBRARY_DIRS}")
+            message(STATUS "Boost use static libs: ${Boost_USE_STATIC_LIBS}")
+            message(STATUS "Boost is multi-threaded: ${CPPKAFKA_BOOST_USE_MULTITHREADED}")
+            message(STATUS "Boost libraries: ${Boost_LIBRARIES}")
+        endif()
+        add_subdirectory(examples)
+    else()
+        message(STATUS "Disabling examples")
+    endif()
 endif()
 
 # Add a target to generate API documentation using Doxygen

src/CMakeLists.txt

@@ -47,7 +47,12 @@ set_target_properties(${TARGET_NAME} PROPERTIES
         VERSION ${CPPKAFKA_VERSION}
         SOVERSION ${CPPKAFKA_VERSION})
 # In CMake >= 3.15 Boost::boost == Boost::headers
-target_link_libraries(${TARGET_NAME} PUBLIC RdKafka::rdkafka Boost::boost)
+target_link_libraries(${TARGET_NAME} PUBLIC RdKafka::rdkafka)
+
+if(NOT CPPKAFKA_DISABLE_EXAMPLES)
+    target_link_libraries(${TARGET_NAME} PUBLIC Boost::boost)
+endif()
+
 if (WIN32)
     # On windows ntohs and related are in ws2_32
     target_link_libraries(${TARGET_NAME} PUBLIC ws2_32.lib)