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Re: [avr-chat] printf( float ) issues using avr-gcc w/ AVR Studio
From: |
Rolf Magnus |
Subject: |
Re: [avr-chat] printf( float ) issues using avr-gcc w/ AVR Studio |
Date: |
Thu, 31 Aug 2006 12:31:25 +0200 |
User-agent: |
KMail/1.9.1 |
On Thursday 31 August 2006 11:49, Reza Naima wrote:
> So I know that you're supposed to go into the configuration window and
> add the _flt libs to get floating point to work, but it doesn't seem to
> be working. Besides that, what's odd is that when I add it, the program
> size gets smaller. If I don't have any libs selected, then printf still
> works somehow (without the float)? What's going on here?
>
> Here's the command line that avr studio generates :
>
> avr-gcc.exe -mmcu=atmega64 main.o ringbuffer.o usb.o delay.o events.o
> uart.o kw1281.o timer.o -lprintf_flt -lm -o usbtest.elf
The printf_flt library gets linked after libc, so the vesion in libc is first
found and used. Try -Wl,-u,vfprintf -lprintf_flt