libc/common: Create z_ aliases for malloc family functions

These aliases will be used to direct libc allocations to the common
allocator during linking.

Signed-off-by: Keith Packard <[email protected]>

lib/libc/common/source/stdlib/malloc.c

@@ -21,6 +21,14 @@
 #include <zephyr/sys/mem_manage.h>
 #endif
 
+#ifndef __clang__
+#pragma GCC diagnostic ignored "-Wmissing-attributes"
+#endif
+
+#define	__z_reference(sym)	\
+extern __typeof(sym) z_ ## sym __attribute__((__alias__(__STRING(sym))))
+
+
 #define LOG_LEVEL CONFIG_KERNEL_LOG_LEVEL
 #include <zephyr/logging/log.h>
 LOG_MODULE_DECLARE(os, CONFIG_KERNEL_LOG_LEVEL);
@@ -188,6 +196,9 @@ void *memalign(size_t alignment, size_t size)
 {
 	return aligned_alloc(alignment, size);
 }
+
+__z_reference(memalign);
+
 #endif
 
 static int malloc_prepare(void)
@@ -304,6 +315,9 @@ void *calloc(size_t nmemb, size_t size)
 
 	return ret;
 }
+
+__z_reference(calloc);
+
 #endif /* CONFIG_COMMON_LIBC_CALLOC */
 
 #ifdef CONFIG_COMMON_LIBC_REALLOCARRAY
@@ -315,4 +329,12 @@ void *reallocarray(void *ptr, size_t nmemb, size_t size)
 	}
 	return realloc(ptr, size);
 }
+
+__z_reference(reallocarray);
+
 #endif /* CONFIG_COMMON_LIBC_REALLOCARRAY */
+
+__z_reference(malloc);
+__z_reference(aligned_alloc);
+__z_reference(free);
+__z_reference(realloc);