From 5ec50e41ea76d26bac1686672a8cff2248465f98 Mon Sep 17 00:00:00 2001
From: Bernhard Guillon <Bernhard.Guillon@begu.org>
Date: Tue, 30 Jun 2026 20:08:07 +0200
Subject: cool ^^ what a nice thing

---
 CMakeLists.txt                | 24 +++++++++++++++++-------
 HelloCMake.runtimeconfig.json |  9 +++++++++
 2 files changed, 26 insertions(+), 7 deletions(-)
 create mode 100644 HelloCMake.runtimeconfig.json

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fbd7581..b76d217 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,21 +1,31 @@
 cmake_minimum_required(VERSION 4.3)
 project(HelloCMake)
 
-find_program(CSC_EXECUTABLE NAMES csc csc.exe)
-if(NOT CSC_EXECUTABLE)
-    message(FATAL_ERROR "C# compiler (csc) not found!")
-endif()
+set(DOTNET_ROOT /usr/share/dotnet)
+set(CSC_DLL ${DOTNET_ROOT}/sdk/10.0.109/Roslyn/bincore/csc.dll)
+set(RUNTIME_DIR ${DOTNET_ROOT}/shared/Microsoft.NETCore.App/10.0.9)
 
 set(OUTPUT_DIR ${CMAKE_BINARY_DIR})
 set(SOURCES ${CMAKE_SOURCE_DIR}/Program.cs)
 set(TARGET HelloCMake)
-set(OUTPUT_FILE ${OUTPUT_DIR}/${TARGET}.exe)
+set(OUTPUT_FILE ${OUTPUT_DIR}/${TARGET}.dll)
 
 add_custom_command(
     OUTPUT ${OUTPUT_FILE}
-    COMMAND ${CSC_EXECUTABLE} /target:exe /out:${OUTPUT_FILE} ${SOURCES}
+    COMMAND dotnet ${CSC_DLL}
+        -target:exe
+        -out:${OUTPUT_FILE}
+        -lib:${RUNTIME_DIR}
+        -reference:System.Private.CoreLib.dll
+        -reference:System.Runtime.dll
+        -reference:System.Console.dll
+        -main:Program
+        ${SOURCES}
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different
+        ${CMAKE_SOURCE_DIR}/HelloCMake.runtimeconfig.json
+        ${OUTPUT_DIR}/${TARGET}.runtimeconfig.json
     DEPENDS ${SOURCES}
-    COMMENT "Compiling ${TARGET} with csc..."
+    COMMENT "Compiling ${TARGET} with Roslyn csc..."
 )
 
 add_custom_target(${TARGET} ALL DEPENDS ${OUTPUT_FILE})
diff --git a/HelloCMake.runtimeconfig.json b/HelloCMake.runtimeconfig.json
new file mode 100644
index 0000000..e431d27
--- /dev/null
+++ b/HelloCMake.runtimeconfig.json
@@ -0,0 +1,9 @@
+{
+  "runtimeOptions": {
+    "tfm": "net10.0",
+    "framework": {
+      "name": "Microsoft.NETCore.App",
+      "version": "10.0.0"
+    }
+  }
+}
-- 
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