Building newlib-2.1.0 for m68k fails

Jeff Johnston
Fri Aug 15 19:35:00 GMT 2014

Hi Anders/Keith,

The patch should instead be setting _READ_WRITE_RETURN_TYPE in newlib/libc/include/sys/config.h
to ssize_t for m68k since the io-read.c code has been specifying ssize_t for quite
a while now.

Please try the attached patch for newlib and let me know if there are any issues.

-- Jeff J.

----- Original Message -----
From: "Anders Montonen" <>
Sent: Thursday, August 14, 2014 1:17:59 PM
Subject: Re: Building newlib-2.1.0 for m68k fails

On Aug 7, 2014, at 2:09, Keith Clifford wrote:

> On Cygwin I'm building gcc-4.91 along with newlib-2.1.0 for a mingw host and
> an m68k ELF target. Building newlib failed when trying to compile io-read.c
> because the return type of read is a ssize_t but the prototype uses
> _READ_WRITE_RETURN_TYPE which in my configuration was defined to int. The
> attached patch fixed the problem.

FWIW, this patch fixed my build problems.

Anders Montonen
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