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[PATCH Newlib]Introducing new config option to disable optimization on unbuffered unix stream file

From: "Bin Cheng" <bin dot cheng at arm dot com>
To: <newlib at sourceware dot org>
Date: Fri, 14 Jun 2013 12:41:44 +0800
Subject: [PATCH Newlib]Introducing new config option to disable optimization on unbuffered unix stream file

Hi,

For now newlib vfprintf_r calls __sbprintf doing optimization on unbuffered
unix stream file. This brings about 120 bytes overhead for text and 1KB for
stack consumption for fprintf(stderr, ...)
This patch introduces option "--disable-newlib-unbuf-opt" to allow end user
to disable the optimization and it doesn't change the default behavior.

This patch also corrects a typo in configure for NEWLIB_NANO_MALLOC. Since
configuration is an auto regenerated file, I just include it in this patch.

Is it OK?
Thanks.
bin

2013-06-14  Bin Cheng  <bin.cheng@arm.com>
	* acconfig.h (_UNBUF_STREAM_OPT): Undef
	* newlib.hin (_UNBUF_STREAM_OPT): Undef
	* configure.in (--enable-newlib-unbuf-stream-opt): New option.
	* configure: Regenerated.
	* libc/stdio/vfprintf.c (_VFPRINTF_R): Don't do optimization on
	unbuffered stream files.
	* libc/stdio/vfwprintf.c (_VFWPRINTF_R): Likewise.
	* README: Add description about the option.

Attachment: unbuf-stream-opt-20130614.txt
Description: Text document

Follow-Ups:
- RE: [PATCH Newlib]Introducing new config option to disable optimization on unbuffered unix stream file
  - From: Howland Craig D (Craig)

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