From f970afff9da332fbbc6bee4472edcfb5d355b388 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Fri, 27 Dec 2019 04:22:53 +0200
Subject: [PATCH] Disable installation without the superproject; add comments

---
 CMakeLists.txt | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 51bda0d..cedc466 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,8 +3,10 @@
 # Distributed under the Boost Software License, Version 1.0.
 # 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)
-project(BoostStaticAssert VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
+
+project(boost_static_assert VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
 
 add_library(boost_static_assert INTERFACE)
 add_library(Boost::static_assert ALIAS boost_static_assert)
@@ -16,10 +18,12 @@ target_link_libraries(boost_static_assert
         Boost::config
 )
 
-include(BoostInstall OPTIONAL RESULT_VARIABLE HAVE_BOOST_INSTALL)
+# boost_install requires PROJECT_VERSION
+# Without the superproject, we don't have any, so skip installation
 
-if(HAVE_BOOST_INSTALL)
+if(BOOST_SUPERPROJECT_VERSION)
 
-    boost_install(TARGETS boost_static_assert HEADER_DIRECTORY include/)
+  include(BoostInstall)
+  boost_install(TARGETS boost_static_assert HEADER_DIRECTORY include/)
 
 endif()