[PATCH, ARM] Don't use __thumb2__ to select _REENT_SMALL
Tue Jun 2 14:13:00 GMT 2009
On Tue, 2009-06-02 at 14:46 +0100, Paul Brook wrote:
> On Tuesday 02 June 2009, Richard Earnshaw wrote:
> > This cost me at least a couple of hours debugging at the weekend; I was
> > trying to work out why my file handles were all corrupted when compiling
> > code for Thumb-2. It turns out that Newlib's config.h was changing the
> > ABI depending on the instruction set it was compiling for -- a big No
> > No, since code is supposed to interwork freely between the two ISAs!
> I'm fairly sure I tested this, and concluded that it had no effect on the
> external library ABI. In fact I think I fixed bugs related to this.
> i.e. this only matters if you're trying to compile part of the library as
> Thumb-2 and part as ARM. Do we really care about that? Or did I miss
Yes, this leaks out into user code -- at least it does for me. Try
building the standard arm-eabi multilib tools and then running the gcc
testsuite with -mcpu=cortex-a8 and -mthumb. Programs such as
gcc.c-torture/exectute/fprintf-1.c will then fail.
The definition of stdout is:
#define stdout (_REENT->_stdout)
Which thus depends on the layout of _REENT.
Richard Earnshaw Email: Richard.Earnshaw@arm.com
Engineering Manager Phone: +44 1223 400569 (Direct + VoiceMail)
OpenSource Tools Switchboard: +44 1223 400400
ARM Ltd Fax: +44 1223 400410
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