Optional: Move optional-lite to the include/third-party directory

This fixes the use case of adding the include folder manually to an outside project.
2026-08-05 09:28:40 +02:00 · 2021-04-23 20:01:53 -04:00
parent b7ce9819bd
commit 6c1cbc9db8
44 changed files with 1 additions and 5 deletions
@@ -0,0 +1,129 @@
+# Copyright 2016-2018 by Martin Moene
+#
+# https://github.com/martinmoene/optional-lite
+#
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+cmake_minimum_required( VERSION 3.5 FATAL_ERROR )
+
+# optional-lite project and version, updated by script/update-version.py:
+
+project(
+    optional_lite
+    VERSION 3.4.0
+#   DESCRIPTION "A C++17-like optional, a nullable object for C++98, C++11 and later in a single-file header-only library"
+#   HOMEPAGE_URL "https://github.com/martinmoene/optional-lite"
+    LANGUAGES CXX )
+
+# Package information:
+
+set( unit_name       "optional" )
+set( package_nspace  "nonstd" )
+set( package_name    "${unit_name}-lite" )
+set( package_version "${${PROJECT_NAME}_VERSION}" )
+
+message( STATUS "Project '${PROJECT_NAME}', package '${package_name}' version: '${package_version}'")
+
+# Toplevel or subproject:
+
+if ( CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME )
+    set( optional_IS_TOPLEVEL_PROJECT TRUE )
+else()
+    set( optional_IS_TOPLEVEL_PROJECT FALSE )
+endif()
+
+# If toplevel project, enable building and performing of tests, disable building of examples:
+
+option( OPTIONAL_LITE_OPT_BUILD_TESTS    "Build and perform optional-lite tests" ${optional_IS_TOPLEVEL_PROJECT} )
+option( OPTIONAL_LITE_OPT_BUILD_EXAMPLES "Build optional-lite examples" OFF )
+
+option( OPTIONAL_LITE_OPT_SELECT_STD     "Select std::optional"    OFF )
+option( OPTIONAL_LITE_OPT_SELECT_NONSTD  "Select nonstd::optional" OFF )
+
+# If requested, build and perform tests, build examples:
+
+if ( OPTIONAL_LITE_OPT_BUILD_TESTS )
+    enable_testing()
+    add_subdirectory( test )
+endif()
+
+if ( OPTIONAL_LITE_OPT_BUILD_EXAMPLES )
+    add_subdirectory( example )
+endif()
+
+#
+# Interface, installation and packaging
+#
+
+# CMake helpers:
+
+include( GNUInstallDirs )
+include( CMakePackageConfigHelpers )
+
+# Interface library:
+
+add_library(
+    ${package_name} INTERFACE )
+
+add_library(
+    ${package_nspace}::${package_name} ALIAS ${package_name} )
+
+target_include_directories(
+    ${package_name}
+    INTERFACE
+        "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>"
+        "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>" )
+
+# Package configuration:
+# Note: package_name and package_target are used in package_config_in
+
+set( package_folder         "${package_name}" )
+set( package_target         "${package_name}-targets" )
+set( package_config         "${package_name}-config.cmake" )
+set( package_config_in      "${package_name}-config.cmake.in" )
+set( package_config_version "${package_name}-config-version.cmake" )
+
+configure_package_config_file(
+    "${CMAKE_CURRENT_SOURCE_DIR}/cmake/${package_config_in}"
+    "${CMAKE_CURRENT_BINARY_DIR}/${package_config}"
+    INSTALL_DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${package_folder}"
+)
+
+configure_file(
+   "${CMAKE_CURRENT_SOURCE_DIR}/cmake/${package_config_version}.in"
+   "${CMAKE_CURRENT_BINARY_DIR}/${package_config_version}" @ONLY
+)
+
+# Installation:
+
+install(
+    TARGETS      ${package_name}
+    EXPORT       ${package_target}
+#   INCLUDES DESTINATION "${...}"  # already set via target_include_directories()
+)
+
+install(
+    EXPORT       ${package_target}
+    NAMESPACE    ${package_nspace}::
+    DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${package_folder}"
+)
+
+install(
+    FILES       "${CMAKE_CURRENT_BINARY_DIR}/${package_config}"
+                "${CMAKE_CURRENT_BINARY_DIR}/${package_config_version}"
+    DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${package_folder}"
+)
+
+install(
+    DIRECTORY   "include/"
+    DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
+)
+
+export(
+    EXPORT       ${package_target}
+    NAMESPACE    ${package_nspace}::
+    FILE         "${CMAKE_CURRENT_BINARY_DIR}/${package_name}-targets.cmake"
+)
+
+# end of file