cleaned up code base don mborland's suggestions [ci skip]

CMakeLists.txt

@@ -1,61 +0,0 @@
-# Copyright 2020 Peter Dimov
-# Copyright 2021 Matt Borland
-# Distributed under the Boost Software License, Version 1.0.
-# https://www.boost.org/LICENSE_1_0.txt
-
-cmake_minimum_required(VERSION 3.5...3.16)
-
-project(boost_math VERSION 1.89.0 LANGUAGES CXX)
-
-add_library(boost_math INTERFACE)
-
-add_library(Boost::math ALIAS boost_math)
-
-target_include_directories(boost_math INTERFACE include)
-if(NOT CMAKE_VERSION VERSION_LESS "3.19")
-  file(GLOB_RECURSE headers include/*.hpp)
-  target_sources(boost_math PRIVATE ${headers})
-endif()
-
-include(CMakeDependentOption)
-
-cmake_dependent_option(BOOST_MATH_STANDALONE "Use Boost.Math in standalone mode" ON "NOT BOOST_SUPERPROJECT_VERSION" OFF)
-
-message(STATUS "Boost.Math: standalone mode ${BOOST_MATH_STANDALONE}")
-
-if(BOOST_MATH_STANDALONE)
-
-  target_compile_definitions(boost_math INTERFACE BOOST_MATH_STANDALONE=1)
-
-else()
-
-  target_link_libraries(boost_math
-    INTERFACE
-      Boost::assert
-      Boost::concept_check
-      Boost::config
-      Boost::core
-      Boost::integer
-      Boost::lexical_cast
-      Boost::predef
-      Boost::random
-      Boost::static_assert
-      Boost::throw_exception
-  )
-
-endif()
-
-if(BUILD_TESTING AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/test/CMakeLists.txt")
-
-  add_subdirectory(test)
-
-# Only enable tests when we're the root project
-elseif(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
-
-  include(CTest)
-  add_subdirectory(test)
-  
-  include(GNUInstallDirs)
-  install(DIRECTORY "include/" DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
-
-endif()