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--- howto:module_std_gcc15 [2025-04-25 13:23] – [How to use C++ module std in GNU g++-15] rrichter
+++ howto:module_std_gcc15 [2025-04-27 09:33] (aktuell) – [How to use C++ module std in GNU g++-15] rrichter
@@ Zeile 15: / Zeile 15: @@
 Prerequisites:
-  * GCC 15.1 (just released!) or GCC 16 HEAD
+  * g++ 15.1 (just released!) or [[https://www.equation.com/servlet/equation.cmd?fa=fortran|g++ 16 HEAD]]
   * CMake 3.31.3
   * Ninja 1.12.1
@@ Zeile 22: / Zeile 22: @@
   * CMake supports C++ modules for Ninja generator only
-  * CMake tells Ninja nothing about module std. Hack: extra library ''%%module_std%%'' in ''%%CMakeList.txt%%''.
+  * 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 ====
@@ Zeile 34: / Zeile 35: @@
     LANGUAGES CXX)
-# temporary hack for GCC g++16.0 HEAD https://www.equation.com gcc-15-20220420-64.exe
+# 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)
@@ Zeile 41: / Zeile 42: @@
     PUBLIC
         FILE_SET CXX_MODULES FILES
-            gnu/std.cc # modified from MinGW\include\c++\16.0.0\bits\std.cc
+            gnu/std.cc # copied from MinGW\include\c++\16.0.0\bits\std.cc
 )
 target_compile_features(module_std PUBLIC cxx_std_26)
@@ Zeile 47: / Zeile 48: @@
 # target_link_libraries(...XYZ... PRIVATE module_std)
-# another hack for advanced features like std::print(), std::stacktrace, etc in g++14, g++15, and g++16 HEAD:
+# 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)
@@ Zeile 58: / Zeile 59: @@
 )
 target_compile_features(my_module PUBLIC cxx_std_26)
-target_link_libraries(my_module PRIVATE module_std)
+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 module_std)
 target_link_libraries(demo PRIVATE my_module)
-target_link_libraries(demo PRIVATE stdc++exp)
+target_link_libraries(demo PRIVATE module_std) # hack #1
+target_link_libraries(demo PRIVATE stdc++exp)  # hack #2
 </code>