Export cmake config package

Author: ClausKlein

CMakeLists.txt

@@ -2,15 +2,18 @@
 #
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-cmake_minimum_required(VERSION 3.27)
+cmake_minimum_required(VERSION 3.27...3.31)
 
 project(beman_optional26 VERSION 0.0.0 LANGUAGES CXX)
 
 # Includes
-include(CTest)
-include(FetchContent)
+include(CPack)
+include(GNUInstallDirs)
+include(CMakePackageConfigHelpers)
 
-set(TARGETS_EXPORT_NAME ${CMAKE_PROJECT_NAME}Targets)
+set(TARGET_PACKAGE_NAME ${PROJECT_NAME})
+set(TARGETS_EXPORT_NAME ${TARGET_PACKAGE_NAME}-targets)
+set(INSTALL_CONFIGDIR ${CMAKE_INSTALL_LIBDIR}/cmake/${TARGET_PACKAGE_NAME})
 
 option(
     OPTIONAL26_ENABLE_TESTING
@@ -20,6 +23,8 @@ option(
 
 # Build the tests if enabled via the option OPTIONAL26_ENABLE_TESTING
 if(OPTIONAL26_ENABLE_TESTING)
+    include(FetchContent)
+
     # Fetch GoogleTest
     FetchContent_Declare(
         googletest
@@ -29,12 +34,15 @@ if(OPTIONAL26_ENABLE_TESTING)
             e39786088138f2749d64e9e90e0f9902daa77c40 # release-1.15.0
     )
     FetchContent_MakeAvailable(googletest)
+
+    enable_testing()
 endif()
 
 set(CMAKE_VERIFY_INTERFACE_HEADER_SETS ON)
 
 # Create the library target and named header set for beman_optional26
 add_library(beman_optional26 INTERFACE)
+add_library(Beman::Optional26::beman_optional26 ALIAS beman_optional26)
 target_sources(
     beman_optional26
     PUBLIC FILE_SET beman_optional26_headers TYPE HEADERS BASE_DIRS include
@@ -59,23 +67,24 @@ add_subdirectory(include/beman/optional26)
 
 add_subdirectory(examples)
 
-include(CMakePackageConfigHelpers)
+# install
+write_basic_package_version_file(
+    ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_PACKAGE_NAME}-config-version.cmake
+    VERSION ${PROJECT_VERSION}
+    COMPATIBILITY AnyNewerVersion
+)
 
-# This will be used to replace @PACKAGE_cmakeModulesDir@
-set(cmakeModulesDir cmake/beman)
 configure_package_config_file(
     cmake/Config.cmake.in
-    BemanOptional26Config.cmake
-    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/beman/optional26/
-    PATH_VARS cmakeModulesDir
-    NO_SET_AND_CHECK_MACRO
-    NO_CHECK_REQUIRED_COMPONENTS_MACRO
+    ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_PACKAGE_NAME}-config.cmake
+    INSTALL_DESTINATION ${INSTALL_CONFIGDIR}
 )
 
 install(
-    FILES ${CMAKE_CURRENT_BINARY_DIR}/BemanOptional26Config.cmake
-    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/beman/optional26/
-    COMPONENT beman_optional26_development
+    FILES
+        ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_PACKAGE_NAME}-config.cmake
+        ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_PACKAGE_NAME}-config-version.cmake
+    DESTINATION ${INSTALL_CONFIGDIR}
 )
 
 # Coverage

examples/CMakeLists.txt

@@ -3,9 +3,15 @@
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 # cmake-format: on
 
-set(BEMAN_OPTIONAL26_LIBRARY "beman_optional26")
+cmake_minimum_required(VERSION 3.27...3.31)
 
-include(GNUInstallDirs)
+project(beman_optional26_example VERSION 0.0.0 LANGUAGES CXX)
+
+set(BEMAN_OPTIONAL26_LIBRARY "Beman::Optional26::beman_optional26")
+
+if(PROJECT_IS_TOP_LEVEL)
+    find_package(beman_optional26 0.0.0 EXACT REQUIRED)
+endif()
 
 # List of all buildable examples.
 set(EXAMPLES
@@ -27,13 +33,15 @@ foreach(example ${EXAMPLES})
     # Link example with the library.
     target_link_libraries(${example} "${BEMAN_OPTIONAL26_LIBRARY}")
 
-    # Install .
-    install(
-        TARGETS
-            ${example}
-            COMPONENT
-            beman_optional26_examples
-            DESTINATION
-            ${CMAKE_INSTALL_BINDIR}
-    )
+    if(NOT PROJECT_IS_TOP_LEVEL)
+        # Install .
+        install(
+            TARGETS
+                ${example}
+                COMPONENT
+                beman_optional26_examples
+                DESTINATION
+                ${CMAKE_INSTALL_BINDIR}
+        )
+    endif()
 endforeach()

include/beman/optional26/CMakeLists.txt

@@ -33,9 +33,9 @@ install(
 
 install(
     EXPORT beman_optional26_export
-    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/beman/optional26/
+    DESTINATION ${INSTALL_CONFIGDIR}
     NAMESPACE Beman::Optional26::
-    FILE beman_optional26.cmake
+    FILE beman_optional26-config-targets.cmake
     EXPORT_LINK_INTERFACE_LIBRARIES
     COMPONENT beman_optional26_development
 )

src/beman/optional26/tests/CMakeLists.txt

@@ -29,7 +29,7 @@ target_sources(
 
 target_link_libraries(
     beman_optional26_test
-    PRIVATE beman_optional26 GTest::gtest GTest::gtest_main
+    PRIVATE Beman::Optional26::beman_optional26 GTest::gtest GTest::gtest_main
 )
 
 # Issue #32: Re-enable ASAN run CI/clang-19.
@@ -41,7 +41,10 @@ gtest_add_tests(TARGET beman_optional26_test "" AUTO)
 
 add_library(constructor_fails test_constructor_fail.cpp)
 
-target_link_libraries(constructor_fails PRIVATE beman_optional26)
+target_link_libraries(
+    constructor_fails
+    PRIVATE Beman::Optional26::beman_optional26
+)
 
 set_target_properties(
     constructor_fails