The R Project SVN – R – Diff – /trunk/src/gnuwin32/malloc.c

 #ifndef LACKS_SYS_TYPES_H
 #include <sys/types.h>  /* For size_t */
 #endif  /* LACKS_SYS_TYPES_H */
-/* The maximum possible size_t value has all bits set */
+/* The maximum possible size_t value has all bits set.
+   C99 has SIZE_MAX for this. */
 #define MAX_SIZE_T           (~(size_t)0)
 #ifndef ONLY_MSPACES
 #define ONLY_MSPACES 0
 #endif  /* ONLY_MSPACES */
     if (((n_elements | elem_size) & ~(size_t)0xffff) &&
         (req / n_elements != elem_size))
       req = MAX_SIZE_T; /* force downstream failure on overflow */
+  }
   mem = dlmalloc(req);
+/* gcc 9.2 objects to this on x64, as it claims req is twice the
+   maximum object size.
+   warning: 'memset' specified bound 18446744073709551615 exceeds
+   maximum object size 9223372036854775807 [-Wstringop-overflow=]
+   Looks like a bug in mingw64 (max(size_t) is 2^64-1).
+*/
   if (mem != 0 && calloc_must_clear(mem2chunk(mem)))
     memset(mem, 0, req);
   return mem;
+}

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