Re: [avr-gcc-list] strange c++ obiect initialization problems (full code included)

[Georg-Johann Lay]

Marcin S schrieb:
> Hello there,
> 
> from time to time i have a strange problems when initializing class
> objects in file range by their respective constructors, i noted that
> problem occurs only when that constructors takes pointers to other
> global objects, tables or something else.
> 
> Whats the problem? in best scenario object pointer are wrongly set and
> pointing to some random locations, at worst my program does not start
> at all (event with my main() func empty) it just hangs
> 
> here is link to my code
> http://dl.dropbox.com/u/6883398/Lays.tar.bz2
> its and eclipse project, simple "make" in project directory should
> work too. Note that archive contains already compiled program in
> "Release" directory, this compilation does not work at all! (worst
> case scenario described above).
> 
> As I wrote this program incrementaly it stopped working after i added
> 2 objects inits in layouts.cpp
> 
>         CLayPGMString minTag(minTagData,strMin,true,CLayPGMString::XSMALL);
>       CLayPGMString maxTag(maxTagData,strMax,true,CLayPGMString::XSMALL);
> 
> strMin and strMax params are pointers to strings in PROGMEM, if i
> replace it with zeros like
> 
>         CLayPGMString minTag(minTagData,0,true,CLayPGMString::XSMALL);
>       CLayPGMString maxTag(maxTagData,0,true,CLayPGMString::XSMALL);
> 
> program starts again.
> 
> Other important thing noted is, when I initialise those objects in
> file range with their default, empty constructors and then set needed
> pointers at run time (for example right after main() function)
> everything works too.
> I ran out of ideas what could be wrong, maybe wrong code, I'm open to
> any suggestions.
> 
> I'm using avr-gcc-4.5.2 on gentoo linux, also checked on stable 4.4
> and it behaves exactly the same way.
> 
> Marcin

Do you see r20 used in one of the functions? Reminds me of
http://gcc.gnu.org/PR45263
which is not yet backported to avr-gcc < 4.6

Johann