From 7141a342d9d0e782bd7c1a82ec289e00ef32126d Mon Sep 17 00:00:00 2001
From: TymianekPL <tymi@tymi.org>
Date: Fri, 22 Aug 2025 19:38:22 +0200
Subject: [PATCH] process

Signed-off-by: TymianekPL <tymi@tymi.org>
---
 CMakeLists.txt         | 18 ++++++++++--------
 starlib/CMakeLists.txt | 12 ++++++++++--
 starlib/process.cpp    | 17 +++++++++++++++++
 starlib/process.ixx    |  6 ++++++
 starlib/starlib.cpp    |  4 ++--
 starlib/starlib.ixx    |  5 +----
 testing/CMakeLists.txt |  6 ++++++
 testing/main.cpp       |  7 -------
 8 files changed, 52 insertions(+), 23 deletions(-)
 create mode 100644 starlib/process.cpp
 create mode 100644 starlib/process.ixx

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 43fb636..08fbe18 100644
--- a/CMakeLists.txt
+++ b/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 /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)
\ No newline at end of file
+add_subdirectory(testing)
diff --git a/starlib/CMakeLists.txt b/starlib/CMakeLists.txt
index 5426885..03e44d8 100644
--- a/starlib/CMakeLists.txt
+++ b/starlib/CMakeLists.txt
@@ -1,12 +1,20 @@
-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.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()
diff --git a/starlib/process.cpp b/starlib/process.cpp
new file mode 100644
index 0000000..6ea3b3e
--- /dev/null
+++ b/starlib/process.cpp
@@ -0,0 +1,17 @@
+module;
+#ifdef _WIN32
+#include <Windows.h>
+#else
+#error Unsupported platform
+#endif
+
+module process;
+
+void starlib::process::Exit(int code)
+{
+#ifdef _WIN32
+     ExitProcess(static_cast<UINT>(code));
+#else
+#error Unsupported platform
+#endif
+}
diff --git a/starlib/process.ixx b/starlib/process.ixx
new file mode 100644
index 0000000..618424b
--- /dev/null
+++ b/starlib/process.ixx
@@ -0,0 +1,6 @@
+export module process;
+
+namespace starlib::process
+{
+     export [[noreturn]] void Exit(int code);
+}
diff --git a/starlib/starlib.cpp b/starlib/starlib.cpp
index 1a6d113..d1214c9 100644
--- a/starlib/starlib.cpp
+++ b/starlib/starlib.cpp
@@ -1,6 +1,6 @@
 module starlib;
 
-int starlib::Meow(void)
+extern "C" void DefaultMain(void)
 {
-     return 1234;
+     starlib::process::Exit(1);
 }
diff --git a/starlib/starlib.ixx b/starlib/starlib.ixx
index 9ce39e1..61d3048 100644
--- a/starlib/starlib.ixx
+++ b/starlib/starlib.ixx
@@ -1,6 +1,3 @@
 export module starlib;
 
-namespace starlib
-{
-     export int Meow();
-}
+export import process;
diff --git a/testing/CMakeLists.txt b/testing/CMakeLists.txt
index 4e001af..2a3ab99 100644
--- a/testing/CMakeLists.txt
+++ b/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()
diff --git a/testing/main.cpp b/testing/main.cpp
index 054f807..44a7cb3 100644
--- a/testing/main.cpp
+++ b/testing/main.cpp
@@ -1,8 +1 @@
 import starlib;
-
-#include <print>
-
-int main(void)
-{
-     std::println("Meow() -> {}", starlib::Meow());
-}