From 70a90b4ae07d5dab739f773bf6c4cac05338eb39 Mon Sep 17 00:00:00 2001
From: Mateusz Pusz <mateusz.pusz@gmail.com>
Date: Tue, 10 Sep 2019 18:59:23 +0200
Subject: [PATCH] config.h support removed as it causes issues with
 compiler-explorer

---
 cmake/check_features.cmake     | 30 ------------------------------
 src/CMakeLists.txt             |  4 ----
 src/include/units/bits/hacks.h | 12 ------------
 3 files changed, 46 deletions(-)
 delete mode 100644 cmake/check_features.cmake

diff --git a/cmake/check_features.cmake b/cmake/check_features.cmake
deleted file mode 100644
index f0c66010..00000000
--- a/cmake/check_features.cmake
+++ /dev/null
@@ -1,30 +0,0 @@
-# The MIT License (MIT)
-#
-# Copyright (c) 2018 Mateusz Pusz
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
-
-set(CMAKE_REQUIRED_FLAGS -std=c++2a)
-
-include(CheckTypeSize)
-
-set(CMAKE_EXTRA_INCLUDE_FILES type_traits)
-check_type_size("std::type_identity<int>" UNITS_HAS_STD_TYPE_IDENTITY LANGUAGE CXX)
-
-configure_file(../cmake/config.h.in include/units/bits/config.h)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 65beb501..759d2568 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -34,9 +34,6 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../cmake")
 # include common tools and workarounds
 include(common/cmake/tools)
 
-# check availability of C++20 features
-include(check_features)
-
 # library definition
 add_library(units INTERFACE)
 #target_sources(units INTERFACE
@@ -62,7 +59,6 @@ target_link_libraries(units
 target_include_directories(units
     INTERFACE
         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
-        $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include>
         $<INSTALL_INTERFACE:include>
 )
 target_compile_options(units
diff --git a/src/include/units/bits/hacks.h b/src/include/units/bits/hacks.h
index bf5cb104..84231ecc 100644
--- a/src/include/units/bits/hacks.h
+++ b/src/include/units/bits/hacks.h
@@ -22,22 +22,10 @@
 
 #pragma once
 
-#include <units/bits/config.h>
 #include <experimental/ranges/concepts>
 
 namespace std {
 
-#ifndef UNITS_HAS_STD_TYPE_IDENTITY
-
-  // type_identity
-  template<typename T>
-  struct type_identity { using type = T; };
-
-  template<typename T>
-  using type_identity_t = typename type_identity<T>::type;
-
-#endif // UNITS_HAS_STD_TYPE_IDENTITY
-
   // concepts
   using experimental::ranges::same_as;
   using experimental::ranges::derived_from;