freestanding

Signed-off-by: TymianekPL <tymi@tymi.org>

Author: TymianekPL

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 3.29)    
+cmake_minimum_required (VERSION 3.29)    
 project(StarProject LANGUAGES CXX)
 
 set(CMAKE_CXX_STANDARD 23)
@@ -10,13 +10,15 @@ if (POLICY CMP0141) # MSVC hot-reload schenanigans
   set(CMAKE_MSVC_DEBUG_INFORMATION_FORMAT "$<IF:$<AND:$<C_COMPILER_ID:MSVC>,$<CXX_COMPILER_ID:MSVC>>,$<$<CONFIG:Debug,RelWithDebInfo>:EditAndContinue>,$<$<CONFIG:Debug,RelWithDebInfo>:ProgramDatabase>>")
 endif()
 
-if (MSVC)
-    add_compile_options(/experimental:module /EHsc /utf-8)
-elseif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
-    add_compile_options(-fmodules-ts -stdlib=libc++)
-elseif (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-    add_compile_options(-fmodules-ts)
+if(MSVC)                
+    string(REPLACE "/RTC1" "" OLD_FLAGS "${CMAKE_CXX_FLAGS_DEBUG}")
+    set(CMAKE_CXX_FLAGS_DEBUG "${OLD_FLAGS}")
+    add_compile_options(/permissive- /Zc:preprocessor /JMC /std:c++latest /Za /GR- /GS- /EHsc-)
+elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+    add_compile_options(-ffreestanding -nostdinc++ -fno-exceptions -fno-rtti)
+elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+    add_compile_options(-ffreestanding -nostdinc++ -fno-exceptions -fno-rtti)
 endif()
 
 add_subdirectory(starlib)
-add_subdirectory(testing)
+add_subdirectory(testing)

starlib/CMakeLists.txt

@@ -1,12 +1,19 @@
-add_library(starlib STATIC)
+add_library(starlib STATIC)
 
 # Add module sources
 target_sources(starlib
     PUBLIC
         FILE_SET cxx_modules TYPE CXX_MODULES FILES
             starlib.ixx
+            process.ixx
     PRIVATE
         starlib.cpp
-)
+ "process.ixx")
 
 target_include_directories(starlib PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+
+if(MSVC)
+    target_link_options(starlib PRIVATE /NODEFAULTLIB)
+else()
+    target_link_libraries(starlib PRIVATE -nostdlib++)
+endif()

starlib/starlib.cpp

@@ -4,3 +4,8 @@ int starlib::Meow(void)
 {
      return 1234;
 }
+
+extern "C" void DefaultMain(void)
+{
+
+}

testing/CMakeLists.txt

@@ -6,3 +6,9 @@ target_sources(testing
 )
 
 target_link_libraries(testing PRIVATE starlib)
+
+if(MSVC)
+    target_link_options(testing PRIVATE /NODEFAULTLIB /ENTRY:DefaultMain)
+else()
+    target_link_libraries(testing PRIVATE -nostdlib++)
+endif()

testing/main.cpp

@@ -1,8 +1,6 @@
 import starlib;
 
-#include <print>
-
 int main(void)
 {
-     std::println("Meow() -> {}", starlib::Meow());
+     return starlib::Meow();
 }