Re: [avr-gcc-list] __DATE__ constant, any way to format it differently ?

[Steven Michalske]

CFLAGS+=" -DMY_DATE=`date +%y%m%d` "

and in your code

#ifndef MY_DATE
#error "MY_DATE not defined."
#endif

now use MY_DATE instead of __DATE__

or even better

-DMY_TIME=`date +%s`

this gives you the unix time stamp of seconds since 1970,  you get  
time and date in 1 simple 32bit number that only takes up 4 bytes  
instead of a string.  good if you use printf

you can also always adjust its epoch, or resolution,

/60 to get minutes /3600 for hours etc.
subtract the unix time of jan 1 2009 to get time since the new year

though these are not standard.

Steve

On Jan 28, 2009, at 1:30 PM, Vincent Trouilliez wrote:

> On Wed, 28 Jan 2009 15:21:15 -0600
> David Kelly <address@hidden> wrote:
>
> > OK, but if you don't commit the code to svn (as Vincent has stated in
> > other messages in this thread) then the svn version number is only  
> > "less
> > than or equal to" the real version number.
>
> Yes that's why I give up on this :-/
>
> > I think if you don't like the format of __DATE__ then drop it into a
> > const during compile then pick out the parts you like when  
> > displaying.
> > Should be able to find them at constant offsets at run time.
>
> Hey that's a nice idea, going to fiddle with that as soon as I hit the
> Send button ! Thanks Dave.
>
> > The rule in the Makefile for the file containing __DATE__ needs to  
> > be an
> > "always build."
>
> Oops, good remark, noted.
>
> --
> Vince
>
>
> _______________________________________________
> AVR-GCC-list mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/avr-gcc-list