BuildSystem: add helper to create userspace programs

userspace/create_program.sh

@@ -0,0 +1,34 @@
+#!/bin/sh
+
+set -e
+
+PROGRAM_NAME=$1
+
+mkdir $PROGRAM_NAME
+
+cat > $PROGRAM_NAME/CMakeLists.txt << EOF
+cmake_minimum_required(VERSION 3.26)
+
+project($PROGRAM_NAME CXX)
+
+set(SOURCES
+	main.cpp
+)
+
+add_executable($PROGRAM_NAME \${SOURCES})
+target_compile_options($PROGRAM_NAME PUBLIC -O2 -g)
+add_dependencies($PROGRAM_NAME libc-install)
+target_link_options($PROGRAM_NAME PUBLIC -nodefaultlibs -lc)
+
+add_custom_target($PROGRAM_NAME-install
+	COMMAND cp \${CMAKE_CURRENT_BINARY_DIR}/$PROGRAM_NAME \${BANAN_BIN}/
+	DEPENDS $PROGRAM_NAME
+)
+EOF
+
+cat > $PROGRAM_NAME/main.cpp << EOF
+int main()
+{
+
+}
+EOF