Tests: Added hello (prints a message to the debug board)

Signed-off-by: Maxim Logaev <maxlogaev@proton.me>

CMakeLists.txt

@@ -26,3 +26,4 @@ message(STATUS "SDK_SYSROOT_DIR=${SDK_SYSROOT_DIR}")
 
 add_subdirectory(toolchain)
 add_subdirectory(libraries)
+add_subdirectory(tests)

libraries/CMakeLists.txt

@@ -17,5 +17,4 @@ ExternalProject_Add(
         -DCMAKE_C_COMPILER=i586-kolibrios-gcc
         -DCMAKE_C_COMPILER_WORKS=1
         -DCMAKE_INSTALL_PREFIX=${SDK_SYSROOT_DIR}
-    DEPENDS copy-kos-app-lds
 )

tests/CMakeLists.txt

@@ -0,0 +1,12 @@
+# Rules for building tests
+
+# Pseudo libc (kos-crt-stub)
+ExternalProject_Add(
+    test-hello
+    SOURCE_DIR  ${CMAKE_CURRENT_SOURCE_DIR}/hello
+    CMAKE_ARGS 
+        -DCMAKE_C_COMPILER=i586-kolibrios-gcc
+        -DCMAKE_C_COMPILER_WORKS=1
+        -DCMAKE_INSTALL_PREFIX=${SDK_SYSROOT_DIR}
+    BUILD_ALWAYS TRUE
+)

tests/hello/hello.c

@@ -0,0 +1,13 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ * Copyright (C) 2025 KolibriOS team
+*/
+
+int main()
+{
+    char *hello = "I: Hello KolibriOS from GCC!\n";
+    while(*hello) {
+        __asm__ __inline__("int $0x40" ::"a"(63), "b"(1), "c"(*hello));
+        hello++;
+    }
+}