round in math.h causes compile error with avr-gcc version 4.5.3 about arduino-tiny

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Thank you for taking the time to post this issue.

What is the error message?

Original comment by [email protected] on 2 Nov 2011 at 5:25

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In file included from 
/usr/lib/gcc/avr/4.5.3/../../../avr/include/util/delay.h:44:0,
                 from /usr/lib/gcc/avr/4.5.3/../../../avr/include/avr/delay.h:37,
                 from /home/scott/Arduino Sketches/hardware/tiny/cores/tiny/wiring_private.h:32,
                 from /home/scott/Arduino Sketches/hardware/tiny/cores/tiny/WInterrupts.c:37:
/usr/lib/gcc/avr/4.5.3/../../../avr/include/math.h:426:15: error: expected 
identifier or ‘(’ before ‘double’
/usr/lib/gcc/avr/4.5.3/../../../avr/include/math.h:426:15: error: expected 
‘)’ before ‘>=’ token

Original comment by [email protected] on 2 Nov 2011 at 5:53

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I'm getting the same error with 

//#define round(x)     ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))

already commented out. 
arduino 0022 on Ubuntu 11.10

any ideas?

Original comment by [email protected] on 26 Nov 2011 at 5:38

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ah, got it!

to all who encounter the same problem be careful that it is 
/whatever/hardware/attiny45_85/cores/attiny45_85/wiring.h that gets the change, 
 /whatever/arduino/hardware/arduino/cores/arduino/wiring.h is the one that 
doesn't matter. took me a while to realize the ide was referencing a different 
wiring.h when configured to program an attiny 

Original comment by [email protected] on 26 Nov 2011 at 8:20

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I found I had to edit math.h and add 
#undef round
as line 426 as per http://forums.reprap.org/read.php?146,107925,107925,quote=1

Original comment by [email protected] on 27 Dec 2011 at 4:38

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I also just added an #undef in math.h as well, which should address all targets.

And this is an issue under OSX as well.

Original comment by [email protected] on 17 Aug 2012 at 10:55

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just found this same issue on debian jessie with gcc-avr 4.7.2 / 
arduino-tiny-0100-0016

how is this not fixed in the May 24th 2013 release? i mean even Blink won't 
work without it and its a two year old bug!

the fix that worked for me was commenting out line 137 of 
~/sketchbook/hardware/tiny/cores/tiny/wiring.h

//#define round(x)     ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))

but i assume that now means we can't using the round() function....?

Original comment by [email protected] on 3 Jun 2013 at 8:53

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The round macro has been removed.

Original comment by [email protected] on 6 Jun 2013 at 5:14

• Changed state: Done