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+CMakeFiles/module_header-only-test.dir/Users/clausklein/Workspace/cpp/cxx20/fmt-module/tests/header-only-test.cc.o.d
+@CMakeFiles/module_header-only-test.dir/Users/clausklein/Workspace/cpp/cxx20/fmt-module/tests/header-only-test.cc.o.modmap
+-o CMakeFiles/module_header-only-test.dir/Users/clausklein/Workspace/cpp/cxx20/fmt-module/tests/header-only-test.cc.o -c
+/Users/clausklein/Workspace/cpp/cxx20/fmt-module/tests/header-only-test.cc
+
+FAILED: CMakeFiles/module_header-only-test.dir/Users/clausklein/Workspace/cpp/cxx20/fmt-module/tests/header-only-test.cc.o
+
+/usr/local/Cellar/llvm/19.1.6/bin/clang++ -DFMT_MODULE -DFMT_USE_FCNTL=0 -DHAS_STDLIB_MODULES  -O3 -DNDEBUG -std=gnu++23 -fexperimental-library -stdlib=libc++ -MD -MT CMakeFiles/module_header-only-test.dir/Users/clausklein/Workspace/cpp/cxx20/fmt-module/tests/header-only-test.cc.o -MF CMakeFiles/module_header-only-test.dir/Users/clausklein/Workspace/cpp/cxx20/fmt-module/tests/header-only-test.cc.o.d @CMakeFiles/module_header-only-test.dir/Users/clausklein/Workspace/cpp/cxx20/fmt-module/tests/header-only-test.cc.o.modmap -o CMakeFiles/module_header-only-test.dir/Users/clausklein/Workspace/cpp/cxx20/fmt-module/tests/header-only-test.cc.o -c /Users/clausklein/Workspace/cpp/cxx20/fmt-module/tests/header-only-test.cc
+
+error: enable unstable and experimental library features was disabled in PCH file but is currently enabled
+error: module file CMakeFiles/__cmake_cxx23.dir/std.pcm cannot be loaded due to a configuration mismatch with the current compilation [-Wmodule-file-config-mismatch]
+2 errors generated.
 ninja: build stopped: subcommand failed.
-make: *** [test] Error 1
+bash-5.2$
+
+
+

CMakeLists.txt

@@ -3,6 +3,8 @@ cmake_minimum_required(VERSION 3.30...3.31)
 
 include(cmake/prelude.cmake)
 
+set(CMAKE_CXX_SCAN_FOR_MODULES ON)
+
 # Set experimental flag to enable `import std` support from CMake.
 # This must be enabled before C++ language support.
 if(CMAKE_CXX_SCAN_FOR_MODULES)
@@ -20,7 +22,6 @@ include(cmake/variables.cmake)
 
 set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_CXX_EXTENSIONS ON)
-set(CMAKE_CXX_SCAN_FOR_MODULES ON)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 set(CMAKE_DEBUG_POSTFIX D)

cmake/dev-mode.cmake

@@ -5,7 +5,11 @@ if(FMT_BUILD_TESTING)
   enable_testing()
 
   add_subdirectory(tests)
-  add_subdirectory(module/tests)
+
+  if(NOT CMAKE_CXX_COMPILER_IMPORT_STD)
+    add_subdirectory(module/tests)
+  endif()
+
 endif()
 
 option(FMT_BUILD_MCSS_DOCS "Build documentation using Doxygen and m.css" OFF)