Gnuk 1.2.19 fails to build with gcc-11.2.1

[NIIBE Yutaka]

Hello,

Thank you for your report.

Bertrand Jacquin wrote:
>   In file included from regnual.c:31:
>   types.h:1:23: error: conflicting types for ‘size_t’; have ‘long unsigned int’
>       1 | typedef unsigned long size_t;
>         |                       ^~~~~~
>   In file included from /usr/arm-none-eabi/include/sys/reent.h:14,
>                    from /usr/arm-none-eabi/include/string.h:11,
>                    from regnual.c:29:
>   /usr/lib/gcc/arm-none-eabi/11.2.1/include/stddef.h:209:23: note: previous declaration of ‘size_t’ with type ‘size_t’ {aka ‘unsigned int’}
>     209 | typedef __SIZE_TYPE__ size_t;
>         |                       ^~~~~~
>
> It it safe to assume that type used by gnuk should be redefined to avoid
> conflict with compiler provided types ?

ABI wise, it is same; Both are 32-bit unsigned integer.

You can just remove the definition of size_t in regnual/types.h.
I'll fix.


Initially, when Gnuk started, I assumed freestanding environment.  That
is, an environment with no C library.  That's why we have the header
file regnual/types.h and declaration of memset in regnural.c.

It worked, for a while, in the past.

But GCC changed (or clarified its requirement for freestanding
environment).  GCC requires the freestanding environment to provide
memcpy/memmove/memset/memcmp functions.

Instead of providing the required functions, I moved to use newlib for
that.

Note that most parts of Gnuk (for MCU) never depends on C library,
still.

Now, Gnuk supports emulation, in this case, it uses GNU C library.
(regnual only runs on MCU, not emulation.)
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