[GitHub] ccollins476ad closed pull request #1518: libc/baselibc: syscfg for stubbing out malloc/free

[GitBox <gi...@apache.org>]

ccollins476ad closed pull request #1518: libc/baselibc: syscfg for stubbing out malloc/free
URL: https://github.com/apache/mynewt-core/pull/1518
 
 
   

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diff --git a/libc/baselibc/src/malloc.c b/libc/baselibc/src/malloc.c
index 2bf45515d4..cef8bc9a04 100644
--- a/libc/baselibc/src/malloc.c
+++ b/libc/baselibc/src/malloc.c
@@ -10,6 +10,15 @@
 #include <stdint.h>
 #include "malloc.h"
 
+#include "os/mynewt.h"
+
+#if MYNEWT_VAL(BASELIBC_MALLOC_STUB)
+
+void *malloc(size_t size) { return NULL; }
+void free(void *ptr) { }
+
+#else
+
 /* Both the arena list and the free memory list are double linked
    list with head node.  This the head node. Note that the arena list
    is sorted in order of address. */
@@ -274,3 +283,4 @@ void set_malloc_locking(malloc_lock_t lock, malloc_unlock_t unlock)
     else
         malloc_unlock = &malloc_unlock_nop;
 }
+#endif /* MYNEWT_VAL(BASELIBC_MALLOC_STUB) */
diff --git a/libc/baselibc/syscfg.yml b/libc/baselibc/syscfg.yml
index 7f6dc3cbbf..2496122dec 100644
--- a/libc/baselibc/syscfg.yml
+++ b/libc/baselibc/syscfg.yml
@@ -22,6 +22,13 @@ syscfg.defs:
         description: "Indicates that baselibc is the libc implementation."
         value: 1
 
+    BASELIBC_MALLOC_STUB:
+        description: >
+            Replaces baselibc's implementations of `malloc()` and `free()` with
+            no-op stubs.  Useful for reducing code size in builds that do not
+            use dynamically allocated memory.
+        value: 0
+
     BASELIBC_ASSERT_FILE_LINE:
         defunct: 1
         description: 'Use OS_CRASH_FILE_LINE instead'


 

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