From f5f31d7ba9521aec0f1f08a64c9ea983c9f1c068 Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Mon, 25 Jan 2021 16:51:10 +0000
Subject: [PATCH] Simplify CMakeLists.txt now that we're header only. [CI SKIP]

---
 CMakeLists.txt | 111 +++++++++----------------------------------------
 1 file changed, 19 insertions(+), 92 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a61ba77c..e380b4ad 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,103 +1,30 @@
-# Copyright 2018-2019 Mike Dev
+# Copyright 2018 Mike Dev
+# Copyright 2019 Peter Dimov
 # Distributed under the Boost Software License, Version 1.0.
-# See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
-#
-# NOTE: CMake support for Boost.Regex is currently experimental at best
-#       and the interface is likely to change in the future
+# See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt
 
+# We support CMake 3.5, but prefer 3.16 policies and behavior
+cmake_minimum_required(VERSION 3.5...3.16)
 
-##### How-To:
-#
-# If you have a cmake project that wants to use and compile
-# boost_regex, as part of a single build system run, do the following:
-# 1) clone the boost project and all its sub-projects:
-#
-#   git clone --branch develop --depth 1 --recursive --shallow-submodules https://github.com/boostorg/boost.git boost-root
-#
-# 2) add to your cmake script:
-#
-#   add_subdirectory( <path-to-boost-root> [<build-dir-for-boost-libs>])
-#   target_link_libraries( <my-exec> PUBLIC Boost::regex)
-#
-# 3) run your cmake build as usual
-#
-# ## Explanation:
-#
-# Currently this file does not work standalone. It is expected to be
-# invoked from a parent script via add_subdirectory. That parent script
-# is responsible for providing targets for direct and indirect dependencies,
-# such as Boost::assert,  Boost::concept_check, e.g. by also adding those
-# libraries via add_submodule (order doesn't matter).
-# The parent script can be your own cmake script, but it is easier to just
-# use add the CMakeLists in the root of the boost super project, which
-# will in turn add all boost libraries usable with the add_subdirectory
-# Workflow.
-#
-# Note: You don't need to actually clone all boost libraries. E.g. look
-# into the travis ci file to see on which libraries boost_regex actually
-# depends or use boostdep https://github.com/boostorg/boostdep
+project(boost_regex VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
 
+add_library(boost_regex INTERFACE)
+add_library(Boost::regex ALIAS boost_regex)
 
-##### Current Limitations:
-#
-# - Doesn't compile or run tests
-#
+target_include_directories(boost_regex INTERFACE include)
 
-cmake_minimum_required( VERSION 3.5...3.16 )
-project( boost_regex VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX )
-
-option( BOOST_REGEX_INCLUDE_EXAMPLES "Also build (some) boost regex examples" OFF )
-option( BOOST_REGEX_USE_ICU "Enable ICU support in boost regex" OFF )
-
-file( GLOB BOOST_REGEX_SRC ./src/*.cpp )
-
-add_library( boost_regex ${BOOST_REGEX_SRC} )
-add_library( Boost::regex ALIAS boost_regex )
-
-target_include_directories( boost_regex PUBLIC include )
-
-target_compile_definitions( boost_regex
-    PUBLIC
-        # No need for autolink
-        BOOST_REGEX_NO_LIB
-        $<$<STREQUAL:$<TARGET_PROPERTY:boost_regex,TYPE>,SHARED_LIBRARY>:BOOST_REGEX_DYN_LINK=1>
-        $<$<STREQUAL:$<TARGET_PROPERTY:boost_regex,TYPE>,STATIC_LIBRARY>:BOOST_REGEX_STATIC_LINK=1>
+target_link_libraries(boost_regex
+  INTERFACE
+    Boost::config
+    Boost::throw_exception
 )
 
-# Specify dependencies (including header-only libraries)
-target_link_libraries( boost_regex
-    PUBLIC
-        Boost::assert
-        Boost::concept_check
-        Boost::config
-        Boost::container_hash
-        Boost::core
-        Boost::integer
-        Boost::iterator
-        Boost::mpl
-        Boost::predef
-        Boost::smart_ptr
-        Boost::static_assert
-        Boost::throw_exception
-        Boost::type_traits
-)
+# boost_install requires PROJECT_VERSION
+# Without the superproject, we don't have any, so skip installation
 
-if( BOOST_REGEX_USE_ICU )
-    # ICU Targets could be provided by parent project,
-    # if not, look for them ourselves
-    if( NOT TARGET ICU::dt )
-        # components need to be listed explicitly
-        find_package( ICU COMPONENTS dt in uc REQUIRED )
-    endif()
+if(BOOST_SUPERPROJECT_VERSION)
+
+  include(BoostInstall)
+  boost_install(TARGETS boost_regex HEADER_DIRECTORY include/)
 
-    target_link_libraries( boost_regex
-        PRIVATE
-            ICU::dt ICU::in ICU::uc
-    )
-    target_compile_definitions( boost_regex PRIVATE BOOST_HAS_ICU=1 )
 endif()
-
-if( BOOST_REGEX_INCLUDE_EXAMPLES )
-    add_subdirectory( example/snippets )
-endif()
-