Initial scaffold: Makefile, stub malloc/free/realloc, test harness

Build system produces libft_malloc_$HOSTTYPE.so shared library with
Libft (NOMALLOC=1) as dependency. Stub functions print their name
and return NULL. Test runner compares system malloc vs LD_PRELOAD
output using write(2) to avoid stdio interference.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/free.c b/src/free.c
new file mode 100644
index 0000000..22c3faa
--- /dev/null
+++ b/src/free.c
@@ -0,0 +1,14 @@
+/**
+ * @file   free.c
+ * @brief  Stub implementation of free.
+ */
+
+#include "libft.h"
+#include "malloc.h"
+
+void
+free (void *ptr)
+{
+  (void)ptr;
+  ft_putendl_fd ("FREE", 1);
+}