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--- howto:module_std_gcc15 [2025-04-25 16:36] – [CMake] rrichter
+++ howto:module_std_gcc15 [2026-04-09 16:48] (aktuell) – rrichter
@@ Zeile 1: / Zeile 1: @@
 ====== How to use C++ module std in GNU g++-15 ======
-Modules with g++15, CMake and Ninja under Windows 10. Warning: This is experimental.
+Follow this advice: https://github.com/JRASoftware/cpp23-import-std-guide
-A small demo project. Available on [[https://github.com/rene-richter/cpp_module_std_cmake_gcc15HEAD|Github]].
-How to build and execute:
-<code>
-cd build
-cmake -G Ninja
-ninja
-demo
-</code>
-Prerequisites:
-  * GCC 15.1 (just released!) or GCC 16 HEAD
-  * CMake 3.31.3
-  * Ninja 1.12.1
-Limitations (at the time of writing, 2025-04-25):
-  * CMake supports C++ modules for Ninja generator only
-  * CMake tells Ninja nothing about module std. (I wasn't able to get[[https://www.kitware.com/import-std-in-cmake-3-30/|Kitware's "import std" recipe]] running.) Hack: extra library ''%%module_std%%'' in ''%%CMakeList.txt%%''.
-  * Some features like ''std::print()'' or ''std:stacktrace'' are in GCC's experimental library ''stdc++exp''.
-==== CMake ====
-<code>
-cmake_minimum_required(VERSION 3.31)
-project(
-    compile_with_module_std
-    VERSION 0.0.1
-    LANGUAGES CXX)
-# hack #1: temporary hack for GCC g++16.0 HEAD https://www.equation.com gcc-15-20250420-64.exe
-# to remove when g++ & CMake know about module std
-add_library(module_std)
-target_sources(module_std
-    PUBLIC
-        FILE_SET CXX_MODULES FILES
-            gnu/std.cc # copied from MinGW\include\c++\16.0.0\bits\std.cc
-)
-target_compile_features(module_std PUBLIC cxx_std_26)
-# also to remove (see below):
-# target_link_libraries(...XYZ... PRIVATE module_std)
-# hack #2: advanced features like std::print(), std::stacktrace, etc in g++14, g++15, and g++16 HEAD:
-# target_link_libraries(...XYZ... PRIVATE stdc++exp)
-add_library(my_module)
-target_sources(my_module
-    PUBLIC
-        FILE_SET CXX_MODULES FILES
-            src/my_module.cpp
-)
-target_compile_features(my_module PUBLIC cxx_std_26)
-target_link_libraries(my_module PRIVATE module_std) # hack #1
-add_executable(demo src/demo.cpp)
-target_compile_features(demo PUBLIC cxx_std_26)
-target_link_libraries(demo PRIVATE my_module)
-target_link_libraries(demo PRIVATE module_std) # hack #1
-target_link_libraries(demo PRIVATE stdc++exp)  # hack #2
-</code>
-==== C++ code ====
-Modular ''%%src/my_module.cpp%%''
-<code cpp>
-export module my_first_module;
-import std;
-export namespace something
-{
-std::string hello(std::string name)
-{
-    return "Hello, " + name + '!';
-}
-} // end namespace something
-</code>
-used in ''%%demo.cpp%%'':
-<code cpp>
-import std;
-import my_first_module;
-int main()
-{
-    std::println("{}", something::hello("modules"));
-}
-</code>