Don't provide stdlib.h, but provide gnuk-malloc.h.

ChangeLog

@@ -1,5 +1,9 @@
 2017-10-03  NIIBE Yutaka  <gniibe@fsij.org>
 
+	* polarssl/library/rsa.c: Don't include stdlib.h.
+	* src/gnuk-malloc.h: Rename from stdlib.h.
+	* polarssl/library/bignum.c: Include gnuk-malloc.h.
+
 	* src/Makefile (build/flash.data): Generate.
 
 	* src/main.c (flash_addr_key_storage_start)

polarssl/library/bignum.c

@@ -37,7 +37,7 @@
 #include "polarssl/bignum.h"
 #include "polarssl/bn_mul.h"
 
-#include <stdlib.h>
+#include <gnuk-malloc.h>
 
 #define ciL    (sizeof(t_uint))         /* chars in limb  */
 #define biL    (ciL << 3)               /* bits  in limb  */

polarssl/library/rsa.c

@@ -39,7 +39,6 @@
 #include "polarssl/md.h"
 #endif
 
-#include <stdlib.h>
 #include <stdio.h>
 
 /*

src/gnuk-malloc.h

@@ -0,0 +1,16 @@
+/*
+ * Gnuk uses its own malloc functions.
+ *
+ * The intention is no-dependency to C library.  But, we provide
+ * malloc and free here, since RSA routines uses malloc/free
+ * internally.
+ *
+ */
+
+#include <stddef.h> /* NULL and size_t */
+
+#define malloc(size)	gnuk_malloc (size)
+#define free(p)		gnuk_free (p)
+
+void *gnuk_malloc (size_t);
+void gnuk_free (void *);

src/stdlib.h

@@ -1,22 +0,0 @@
-/*
- * stdlib.h replacement to replace malloc functions
- *
- * The intention is that no dependency to C library.  But since RSA
- * routines uses malloc/free, we provide malloc and free.
- *
- * For GNU/Linux emulation, we can use C library.
- */
-
-#include <stddef.h> /* NULL and size_t */
-
-#define malloc(size)	gnuk_malloc (size)
-#define free(p)		gnuk_free (p)
-
-void *gnuk_malloc (size_t);
-void gnuk_free (void *);
-
-#ifdef GNU_LINUX_EMULATION
-long int random(void);
-void srandom(unsigned int seed);
-void exit(int status);
-#endif