Hello GCC developer team,
I hope I am right here to address my problem with memory usage and g++:
I am writing C++ software for several very small embedded systems (8k and
smaller) and a feature with the virtual tables and the linker does not make my
life easy :-) I have a lot of objects with v
On April 7, 2015 5:00:27 PM GMT+02:00, Stefan Ehrlich
wrote:
>Hello GCC developer team,
>I hope I am right here to address my problem with memory usage and g++:
>
>I am writing C++ software for several very small embedded systems (8k
>and smaller) and a feature with the virtual tables and the li
On 04/07/2015 09:00 AM, Stefan Ehrlich wrote:
> compiler and linker options are:
> avr-g++.exe -c -Os -Wall -fdata-sections -ffunction-sections
> -fvisibility=hidden -fvisibility-inlines-hidden -fno-rtti -flto
> -fuse-linker-plugin -mmcu=atmega8 ...
> avr-gcc.exe -Wall -Os -Wl,-static -Wl,-flto
On Wed, Apr 8, 2015 at 1:11 AM, Zan Lynx wrote:
> On 04/07/2015 09:00 AM, Stefan Ehrlich wrote:
>> compiler and linker options are:
>> avr-g++.exe -c -Os -Wall -fdata-sections -ffunction-sections
>> -fvisibility=hidden -fvisibility-inlines-hidden -fno-rtti -flto
>> -fuse-linker-plugin -mmcu=atm
t without any
effect.
Is here something missing or too much?
Lg
Stefan
-Ursprüngliche Nachricht-
Von: Richard Biener [mailto:richard.guent...@gmail.com]
Gesendet: Dienstag, 07. April 2015 18:42
An: Stefan Ehrlich; gcc@gcc.gnu.org
Betreff: Re: g++keeps unused objects with virtual functi
)
> (.data + .bss + .noinit)
>
>
> I added the -fwhole-program flag (as mentioned by Zan Lynx) but without any
> effect.
> Is here something missing or too much?
>
> Lg
>
> Stefan
>
>
> -Ursprüngliche Nachricht-
> Von: Richard Biener [mailto:richard.guent
> which shows how the global objects initialization keeps things live.
> Early optimization turns it into
>
> (static initializers for t.C) ()
> {
> :
> NotUsedObject._vptr.CObject = &MEM[(void *)&_ZTV7CObject + 16B];
> return;
>
> }
>
> but we don't have any pass removing stores to global
> > which shows how the global objects initialization keeps things live.
> > Early optimization turns it into
> >
> > (static initializers for t.C) ()
> > {
> > :
> > NotUsedObject._vptr.CObject = &MEM[(void *)&_ZTV7CObject + 16B];
> > return;
> >
> > }
> >
> > but we don't have any pass r
n I do?
Stefan
-Ursprüngliche Nachricht-
Von: Jan Hubicka [mailto:hubi...@ucw.cz]
Gesendet: Mittwoch, 08. April 2015 11:00
An: Jan Hubicka
Cc: Richard Biener; Stefan Ehrlich; GCC Development; zl...@acm.org
Betreff: Re: g++keeps unused objects with virtual functions
> > which shows h
> Von: Jan Hubicka [mailto:hubi...@ucw.cz]
> Gesendet: Mittwoch, 08. April 2015 11:00
> An: Jan Hubicka
> Cc: Richard Biener; Stefan Ehrlich; GCC Development; zl...@acm.org
> Betreff: Re: g++keeps unused objects with virtual functions
>
>> > which show
Von: Richard Biener [mailto:richard.guent...@gmail.com]
Gesendet: Mittwoch, 08. April 2015 12:14
An: Stefan Ehrlich
Cc: Jan Hubicka; GCC Development; zl...@acm.org
Betreff: Re: g++keeps unused objects with virtual functions
On Wed, Apr 8, 2015 at 11:59 AM, Stefan Ehrlich
wrote:
> But without the v
il 2015 12:14
> An: Stefan Ehrlich
> Cc: Jan Hubicka; GCC Development; zl...@acm.org
> Betreff: Re: g++keeps unused objects with virtual functions
>
> On Wed, Apr 8, 2015 at 11:59 AM, Stefan Ehrlich
> wrote:
>> But without the virtual keyword the global object never read
: Jan Hubicka; GCC Development; zl...@acm.org
Betreff: Re: g++keeps unused objects with virtual functions
On Wed, Apr 8, 2015 at 1:23 PM, Stefan Ehrlich
wrote:
> Dear Richard,
>
> The optimization step for doing it does already exist --> it is used for
> stack variables/objects, bu
. April 2015 13:32
An: Richard Biener
Cc: Jan Hubicka; GCC Development; zl...@acm.org
Betreff: AW: g++keeps unused objects with virtual functions
That means, that there is no chance to find this in the next future GCC
releases :-(
But anyway... Thanks so far
Stefan
PS: Hope dies last
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