msvc import std

microsoft/STL#3108

https://learn.microsoft.com/en-us/cpp/cpp/tutorial-import-stl-named-module#import-the-standard-library-with-std

CMakeLists.txt

@@ -27,3 +27,4 @@ add_subdirectory(named-module)
 add_subdirectory(module-partition)
 add_subdirectory(module-impl)
 # add_subdirectory(header-unit)
+add_subdirectory(import-std)

import-std/CMakeLists.txt

@@ -0,0 +1,26 @@
+cmake_minimum_required(VERSION 3.27)
+project(import-std)
+
+set(CMAKE_CXX_STANDARD 23)
+
+add_executable(${PROJECT_NAME} main.cpp)
+add_test(NAME ${PROJECT_NAME} COMMAND ${PROJECT_NAME})
+
+if(CMAKE_GENERATOR MATCHES "Visual Studio")
+  # https://gitlab.kitware.com/cmake/cmake/-/issues/24922
+  file(CONFIGURE OUTPUT Directory.Build.props CONTENT [[
+    <Project>
+      <ItemDefinitionGroup>
+        <ClCompile>
+          <BuildStlModules>true</BuildStlModules>
+        </ClCompile>
+      </ItemDefinitionGroup>
+    </Project>
+  ]] @ONLY)
+elseif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+  cmake_path(CONVERT $ENV{VCTOOLSINSTALLDIR}/modules TO_CMAKE_PATH_LIST modules NORMALIZE)
+  target_sources(${PROJECT_NAME} PUBLIC FILE_SET CXX_MODULES
+      BASE_DIRS ${modules}
+      FILES ${modules}/std.ixx
+  )
+endif()

import-std/Makefile.msvc

@@ -0,0 +1,6 @@
+hello.exe: main.cpp
+	cl /nologo /EHsc /std:c++latest "$(VCTOOLSINSTALLDIR)/modules/std.ixx" main.cpp /Fe:hello
+
+clean:
+	-del *.ifc *.obj *.exe
+	-rm  *.ifc *.obj *.exe

import-std/main.cpp

@@ -0,0 +1,6 @@
+import std;
+
+int main()
+{
+    std::println("{}", "Hello, World!");
+}