Fix undefined symbol errors when building for wasi #758, by @anuraaga

include/mimalloc/internal.h

@@ -296,6 +296,12 @@ static inline uintptr_t _mi_align_up(uintptr_t sz, size_t alignment) {
   }
 }
 
+// Align a pointer upwards
+static inline void* mi_align_up_ptr(void* p, size_t alignment) {
+  return (void*)_mi_align_up((uintptr_t)p, alignment);
+}
+
+
 // Divide upwards: `s <= _mi_divide_up(s,d)*d < s+d`.
 static inline uintptr_t _mi_divide_up(uintptr_t size, size_t divider) {
   mi_assert_internal(divider != 0);

src/os.c

@@ -73,10 +73,6 @@ void _mi_os_init(void) {
 bool _mi_os_decommit(void* addr, size_t size, mi_stats_t* stats);
 bool _mi_os_commit(void* addr, size_t size, bool* is_zero, mi_stats_t* tld_stats);
 
-static void* mi_align_up_ptr(void* p, size_t alignment) {
-  return (void*)_mi_align_up((uintptr_t)p, alignment);
-}
-
 static inline uintptr_t _mi_align_down(uintptr_t sz, size_t alignment) {
   mi_assert_internal(alignment != 0);
   uintptr_t mask = alignment - 1;

src/prim/wasi/prim.c

@@ -12,6 +12,9 @@ terms of the MIT license. A copy of the license can be found in the file
 #include "mimalloc/atomic.h"
 #include "mimalloc/prim.h"
 
+#include <stdio.h>   // fputs
+#include <stdlib.h>  // getenv
+
 //---------------------------------------------
 // Initialize
 //---------------------------------------------
@@ -40,6 +43,8 @@ int _mi_prim_free(void* addr, size_t size ) {
 //---------------------------------------------
 
 #if defined(MI_USE_SBRK)
+  #include <unistd.h>  // for sbrk
+
   static void* mi_memory_grow( size_t size ) {
     void* p = sbrk(size);
     if (p == (void*)(-1)) return NULL;