Resolve installed Boost dependencies from the producer configuration

CMakeLists.txt

@@ -64,6 +64,7 @@ target_link_libraries(cli INTERFACE Threads::Threads)
 # ---------------------------------------------------------------
 # Boost.Asio support
 # ---------------------------------------------------------------
+set(CLI_BOOST_COMPILED OFF)
 if(CLI_UseBoostAsio)
     if(POLICY CMP0074)
         cmake_policy(SET CMP0074 NEW)   # <PackageName>_ROOT
@@ -83,6 +84,7 @@ if(CLI_UseBoostAsio)
     add_definitions(-DBOOST_ALL_NO_LIB) # for windows
 
     if(Boost_FOUND)
+        set(CLI_BOOST_COMPILED ON)
         message(STATUS "Using compiled Boost libraries on ${CMAKE_SYSTEM_NAME}")
         target_link_libraries(cli INTERFACE Boost::system Boost::date_time)
     else()
@@ -150,6 +152,10 @@ endif()
 if(CLI_BuildTests)
     enable_testing()
     add_subdirectory(test)
+    add_test(NAME cli_install_consumer
+        COMMAND ${CMAKE_COMMAND}
+            -DTEST_BINARY_DIR=${CMAKE_CURRENT_BINARY_DIR}/install-consumer
+            -P ${CMAKE_CURRENT_SOURCE_DIR}/test/cmake/install-consumer.cmake)
 endif()
 
 # ---------------------------------------------------------------

cliConfig.cmake.in

@@ -2,8 +2,8 @@
 
 include(CMakeFindDependencyMacro)
 
-if (CLI_UseBoostAsio)
-    find_dependency(Boost REQUIRED COMPONENTS system)
+if (@CLI_BOOST_COMPILED@)
+    find_dependency(Boost REQUIRED COMPONENTS system date_time)
 endif()
 
 find_dependency(Threads REQUIRED)

test/cmake/consumer/CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.8...3.27)
+project(cli_install_consumer LANGUAGES CXX)
+
+find_package(cli CONFIG REQUIRED)
+add_executable(consumer main.cpp)
+target_link_libraries(consumer PRIVATE cli::cli)

test/cmake/consumer/main.cpp

@@ -0,0 +1,13 @@
+#include <cli/cli.h>
+#include <sstream>
+
+int main()
+{
+    auto menu = std::make_unique<cli::Menu>("cli");
+    menu->Insert("add", [](std::ostream& out, int a, int b){ out << a + b; });
+    cli::Cli app(std::move(menu));
+    std::ostringstream out;
+    cli::CliSession session(app, out);
+    session.Feed("add 2 3");
+    return out.str() == "5" ? 0 : 1;
+}

test/cmake/install-consumer.cmake

@@ -0,0 +1,26 @@
+# Run with: cmake -DTEST_BINARY_DIR=<scratch directory> -P test/cmake/install-consumer.cmake
+cmake_minimum_required(VERSION 3.8...3.27)
+get_filename_component(CLI_SOURCE_DIR "${CMAKE_CURRENT_LIST_DIR}/../.." ABSOLUTE)
+
+function(run)
+    execute_process(COMMAND ${ARGV} RESULT_VARIABLE result)
+    if(NOT result EQUAL 0)
+        message(FATAL_ERROR "Command failed: ${ARGV}")
+    endif()
+endfunction()
+
+foreach(mode IN ITEMS compiled header_only none)
+    set(root "${TEST_BINARY_DIR}/${mode}")
+    set(options -DCLI_UseBoostAsio=ON)
+    if(mode STREQUAL "header_only")
+        list(APPEND options -DCMAKE_DISABLE_FIND_PACKAGE_Boost=ON)
+    elseif(mode STREQUAL "none")
+        set(options -DCLI_UseBoostAsio=OFF)
+    endif()
+    run("${CMAKE_COMMAND}" "-H${CLI_SOURCE_DIR}" "-B${root}/library"
+        "-DCMAKE_INSTALL_PREFIX=${root}/prefix" ${options})
+    run("${CMAKE_COMMAND}" --build "${root}/library" --target install --config Release)
+    run("${CMAKE_COMMAND}" "-H${CMAKE_CURRENT_LIST_DIR}/consumer" "-B${root}/consumer"
+        "-DCMAKE_PREFIX_PATH=${root}/prefix")
+    run("${CMAKE_COMMAND}" --build "${root}/consumer" --config Release)
+endforeach()