4 files changed, 49 insertions, 0 deletions
diff --git a/tutorial/chapter-4/lib/lib.c b/tutorial/chapter-4/lib/lib.c
new file mode 100644
index 000000000..5dcae0de3
--- /dev/null
+++ b/tutorial/chapter-4/lib/lib.c
@@ -0,0 +1,10 @@
+#include "lib.h"
+
+#ifndef CRUCIAL_DEFINE
+#   error CRUCIAL_DEFINE not defined
+#endif
+
+const char *get_string()
+{
+    return "Hello from library";
+}
diff --git a/tutorial/chapter-4/lib/lib.h b/tutorial/chapter-4/lib/lib.h
new file mode 100644
index 000000000..ef39ca4a1
--- /dev/null
+++ b/tutorial/chapter-4/lib/lib.h
@@ -0,0 +1,8 @@
+#ifndef LIB_H
+#define LIB_H
+
+#include "lib_global.h"
+
+MYLIB_EXPORT const char *get_string();
+
+#endif // LIB_H
diff --git a/tutorial/chapter-4/lib/lib.qbs b/tutorial/chapter-4/lib/lib.qbs
new file mode 100644
index 000000000..1f7bf6e6b
--- /dev/null
+++ b/tutorial/chapter-4/lib/lib.qbs
@@ -0,0 +1,13 @@
+//! [0]
+// lib/lib.qbs
+
+MyLibrary {
+    name: "mylib"
+    files: [
+        "lib.c",
+        "lib.h",
+        "lib_global.h",
+    ]
+    cpp.defines: base.concat(["CRUCIAL_DEFINE"])
+}
+//! [0]
diff --git a/tutorial/chapter-4/lib/lib_global.h b/tutorial/chapter-4/lib/lib_global.h
new file mode 100644
index 000000000..76cce8d36
--- /dev/null
+++ b/tutorial/chapter-4/lib/lib_global.h
@@ -0,0 +1,18 @@
+#ifndef LIB_GLOBAL_H
+#define LIB_GLOBAL_H
+
+#if defined(_WIN32) || defined(WIN32)
+#define MYLIB_DECL_EXPORT __declspec(dllexport)
+#define MYLIB_DECL_IMPORT __declspec(dllimport)
+#else
+#define MYLIB_DECL_EXPORT __attribute__((visibility("default")))
+#define MYLIB_DECL_IMPORT __attribute__((visibility("default")))
+#endif
+
+#if defined(MYLIB_LIBRARY)
+#define MYLIB_EXPORT MYLIB_DECL_EXPORT
+#else
+#define MYLIB_EXPORT MYLIB_DECL_IMPORT
+#endif
+
+#endif // LIB_GLOBAL_H