Merge fd5ab9f1f3 into fae61ed946

apparently, even if MI_USE_CXX is OFF, mimalloc still provides mangled definitions of new/delete operators. It causes inability to statically link mimaloc in our scenario, since we want to have our own overrides of new/delete functions.

src/alloc-override.c

@@ -189,9 +189,8 @@ typedef void* mi_nothrow_t;
   void* operator new[]( std::size_t n, std::align_val_t al) noexcept(false) { return mi_new_aligned(n, static_cast<size_t>(al)); }
   void* operator new  (std::size_t n, std::align_val_t al, const std::nothrow_t&) noexcept { return mi_new_aligned_nothrow(n, static_cast<size_t>(al)); }
   void* operator new[](std::size_t n, std::align_val_t al, const std::nothrow_t&) noexcept { return mi_new_aligned_nothrow(n, static_cast<size_t>(al)); }
-  #endif
 
-#elif (defined(__GNUC__) || defined(__clang__))
+  #elif (defined(__GNUC__) || defined(__clang__))
   // ------------------------------------------------------
   // Override by defining the mangled C++ names of the operators (as
   // used by GCC and CLang).
@@ -234,6 +233,7 @@ typedef void* mi_nothrow_t;
   #else
     #error "define overloads for new/delete for this platform (just for performance, can be skipped)"
   #endif
+  #endif
 #endif // __cplusplus
 
 // ------------------------------------------------------

src/free.c

@@ -340,7 +340,10 @@ mi_decl_nodiscard size_t mi_usable_size(const void* p) mi_attr_noexcept {
 
 void mi_free_size(void* p, size_t size) mi_attr_noexcept {
   MI_UNUSED_RELEASE(size);
-  mi_assert(p == NULL || size <= _mi_usable_size(p,"mi_free_size"));
+  #if MI_DEBUG
+  const size_t available = _mi_usable_size(p,"mi_free_size");
+  mi_assert(p == NULL || size <= available || available == 0 /* invalid pointer */ );
+  #endif
   mi_free(p);
 }