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From: "SztfG at yandex dot ru" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug d/101440] New: Documentation bug for __attribute__ ((access))
Date: Tue, 13 Jul 2021 15:56:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101440

            Bug ID: 101440
           Summary: Documentation bug for __attribute__ ((access))
           Product: gcc
           Version: 10.1.0
               URL: https://gcc.gnu.org/onlinedocs/gcc-10.1.0/gcc/Common-F
                    unction-Attributes.html
            Status: UNCONFIRMED
          Keywords: documentation
          Severity: normal
          Priority: P3
         Component: d
          Assignee: ibuclaw at gdcproject dot org
          Reporter: SztfG at yandex dot ru
  Target Milestone: ---

>>From documentation:

> Examples of the use of the read_only access mode is the argument to the p=
uts function, or the second and third arguments to the memcpy function.

> __attribute__ ((access (read_only, 1, 2))) void* memcpy (void*, const voi=
d*, size_t);

There is no reference to "third argument in memcpy function". Or I don't
understand something? Maybe there must be=20

__attribute__ ((access (write_only, 1, 3), access (read_only, 2, 3))) void*
memcpy (void* restrict, const void* restrict, size_t);

so, if we have
void *memcpy(void *dest, const void *src, size_t n);

then this function can write "size_t n" bytes to "void *dest" and read "siz=
e_t
n" bytes from "void *src"=