From ceaf6ef05eb50b84c5de159a71e5869e2ac38f85 Mon Sep 17 00:00:00 2001
From: Bernhard Guillon <Bernhard.Guillon@begu.org>
Date: Tue, 30 Jun 2026 20:29:11 +0200
Subject: Add FooBar library with CMake build integration

---
 CMakeLists.txt | 26 +++++++++++++++++++++++++-
 FooBar.cs      | 10 ++++++++++
 Program.cs     |  1 +
 3 files changed, 36 insertions(+), 1 deletion(-)
 create mode 100644 FooBar.cs

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b76d217..2f12093 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,28 @@ 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})
+
+# FooBar library
+set(FOOBAR_SOURCES ${CMAKE_SOURCE_DIR}/FooBar.cs)
+set(FOOBAR_OUTPUT ${OUTPUT_DIR}/FooBar.dll)
+
+add_custom_command(
+    OUTPUT ${FOOBAR_OUTPUT}
+    COMMAND dotnet ${CSC_DLL}
+        -target:library
+        -out:${FOOBAR_OUTPUT}
+        -lib:${RUNTIME_DIR}
+        -reference:System.Private.CoreLib.dll
+        -reference:System.Runtime.dll
+        -reference:System.Console.dll
+        ${FOOBAR_SOURCES}
+    DEPENDS ${FOOBAR_SOURCES}
+    COMMENT "Compiling FooBar library with Roslyn csc..."
+)
+
+add_custom_target(FooBar ALL DEPENDS ${FOOBAR_OUTPUT})
+
+# HelloCMake executable
 set(SOURCES ${CMAKE_SOURCE_DIR}/Program.cs)
 set(TARGET HelloCMake)
 set(OUTPUT_FILE ${OUTPUT_DIR}/${TARGET}.dll)
@@ -19,13 +41,15 @@ add_custom_command(
         -reference:System.Private.CoreLib.dll
         -reference:System.Runtime.dll
         -reference:System.Console.dll
+        -reference:${FOOBAR_OUTPUT}
         -main:Program
         ${SOURCES}
     COMMAND ${CMAKE_COMMAND} -E copy_if_different
         ${CMAKE_SOURCE_DIR}/HelloCMake.runtimeconfig.json
         ${OUTPUT_DIR}/${TARGET}.runtimeconfig.json
-    DEPENDS ${SOURCES}
+    DEPENDS ${SOURCES} ${FOOBAR_OUTPUT}
     COMMENT "Compiling ${TARGET} with Roslyn csc..."
 )
 
 add_custom_target(${TARGET} ALL DEPENDS ${OUTPUT_FILE})
+add_dependencies(${TARGET} FooBar)
diff --git a/FooBar.cs b/FooBar.cs
new file mode 100644
index 0000000..1ccbe3b
--- /dev/null
+++ b/FooBar.cs
@@ -0,0 +1,10 @@
+using System;
+
+public class FooBar
+{
+    public static void Print()
+    {
+        Console.WriteLine("FooBar");
+        Console.WriteLine("FooBar");
+    }
+}
diff --git a/Program.cs b/Program.cs
index 5dd49a9..33e286c 100644
--- a/Program.cs
+++ b/Program.cs
@@ -5,5 +5,6 @@ class Program
     static void Main()
     {
         Console.WriteLine("Hello, CMake + C#!");
+        FooBar.Print();
     }
 }
-- 
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