Adds support for C++20 modules

include/boost/config.hpp

@@ -14,6 +14,11 @@
 //           DO NOT MODIFY THIS FILE!
 //
 
+// Make the header safe to include from libraries supporting modules
+#if defined(BOOST_IN_MODULE_PURVIEW) && !defined(BOOST_CONFIG_HPP)
+#  error "Please #include <boost/config.hpp> in your module global fragment"
+#endif
+
 #ifndef BOOST_CONFIG_HPP
 #define BOOST_CONFIG_HPP
 

include/boost/config/compiler/gcc.hpp

@@ -162,9 +162,17 @@
 // See https://svn.boost.org/trac/boost/ticket/11852
 //
 #ifdef __cplusplus
-#include <cstddef>
+#  ifdef __has_include
+#    if __has_include(<version>)
+#      include <version>
+#    else
+#      include <cstddef>
+#    endif
+#  else
+#    include <cstddef>
+#  endif
 #else
-#include <stddef.h>
+#  include <stddef.h>
 #endif
 #if defined(_GLIBCXX_USE_FLOAT128) && !defined(__STRICT_ANSI__) && !defined(BOOST_NVCC_CXX03)
 # define BOOST_HAS_FLOAT128

include/boost/config/disable_module_warnings.hpp

@@ -0,0 +1,15 @@
+// Copyright 2026 Ruben Perez
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#ifdef BOOST_USE_MODULES
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Winclude-angled-in-module-purview"
+#endif
+
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable : 5244)
+#endif
+#endif

include/boost/config/no_tr1/memory.hpp

@@ -18,7 +18,7 @@
 #     define BOOST_CONFIG_NO_MEMORY_RECURSION
 #  endif
 
-#  include <memory>
+#  include <boost/config/std/memory.hpp>
 
 #  ifdef BOOST_CONFIG_NO_MEMORY_RECURSION
 #     undef BOOST_TR1_NO_RECURSION

include/boost/config/platform/linux.hpp

@@ -12,9 +12,17 @@
 
 // make sure we have __GLIBC_PREREQ if available at all
 #ifdef __cplusplus
-#include <cstdlib>
+#  ifdef __has_include
+#    if __has_include(<version>)
+#      include <version> // lightweight and friendly to modules
+#    else
+#      include <cstdlib>
+#    endif
+#  else
+#    include <cstdlib>
+#  endif
 #else
-#include <stdlib.h>
+#  include <stdlib.h>
 #endif
 
 //

include/boost/config/std/algorithm.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <algorithm>
+#endif

include/boost/config/std/any.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <any>
+#endif

include/boost/config/std/array.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <array>
+#endif

include/boost/config/std/atomic.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <atomic>
+#endif

include/boost/config/std/barrier.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <barrier>
+#endif

include/boost/config/std/bit.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <bit>
+#endif

include/boost/config/std/bitset.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <bitset>
+#endif

include/boost/config/std/cassert.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <cassert>
+#endif

include/boost/config/std/cctype.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <cctype>
+#endif

include/boost/config/std/cerrno.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <cerrno>
+#endif

include/boost/config/std/cfenv.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <cfenv>
+#endif

include/boost/config/std/cfloat.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <cfloat>
+#endif

include/boost/config/std/charconv.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <charconv>
+#endif

include/boost/config/std/chrono.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <chrono>
+#endif

include/boost/config/std/cinttypes.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <cinttypes>
+#endif

include/boost/config/std/climits.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <climits>
+#endif

include/boost/config/std/clocale.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <clocale>
+#endif

include/boost/config/std/cmath.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <cmath>
+#endif

include/boost/config/std/codecvt.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <codecvt>
+#endif

include/boost/config/std/compare.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <compare>
+#endif

include/boost/config/std/complex.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <complex>
+#endif

include/boost/config/std/concepts.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <concepts>
+#endif

include/boost/config/std/condition_variable.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <condition_variable>
+#endif

include/boost/config/std/coroutine.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <coroutine>
+#endif

include/boost/config/std/csetjmp.hpp

@@ -0,0 +1,8 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+import std.compat;
+#endif
+#else
+#include <csetjmp>
+#endif

include/boost/config/std/csignal.hpp

@@ -0,0 +1,8 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+import std.compat;
+#endif
+#else
+#include <csignal>
+#endif

include/boost/config/std/cstdarg.hpp

@@ -0,0 +1,8 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+import std.compat;
+#endif
+#else
+#include <cstdarg>
+#endif

include/boost/config/std/cstddef.hpp

@@ -0,0 +1,8 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+import std.compat;
+#endif
+#else
+#include <cstddef>
+#endif

include/boost/config/std/cstdint.hpp

@@ -0,0 +1,8 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+import std.compat;
+#endif
+#else
+#include <cstdint>
+#endif

include/boost/config/std/cstdio.hpp

@@ -0,0 +1,8 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+import std.compat;
+#endif
+#else
+#include <cstdio>
+#endif

include/boost/config/std/cstdlib.hpp

@@ -0,0 +1,8 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+import std.compat;
+#endif
+#else
+#include <cstdlib>
+#endif

include/boost/config/std/cstring.hpp

@@ -0,0 +1,8 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+import std.compat;
+#endif
+#else
+#include <cstring>
+#endif

include/boost/config/std/ctime.hpp

@@ -0,0 +1,8 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+import std.compat;
+#endif
+#else
+#include <ctime>
+#endif

include/boost/config/std/cuchar.hpp

@@ -0,0 +1,8 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+import std.compat;
+#endif
+#else
+#include <cuchar>
+#endif

include/boost/config/std/cwchar.hpp

@@ -0,0 +1,8 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+import std.compat;
+#endif
+#else
+#include <cwchar>
+#endif

include/boost/config/std/cwctype.hpp

@@ -0,0 +1,8 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+import std.compat;
+#endif
+#else
+#include <cwctype>
+#endif

include/boost/config/std/debugging.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <debugging>
+#endif

include/boost/config/std/deque.hpp

@@ -0,0 +1,7 @@
+#ifdef BOOST_USE_MODULES
+#ifndef BOOST_IN_MODULE_PURVIEW
+import std;
+#endif
+#else
+#include <deque>
+#endif