[Buildroot] bug report: c++ programs built by toolchain crash by seg fault

[Buildroot] bug report: c++ programs built by toolchain crash by seg fault

[hayate]

menuconfig:

arm little endian; generic arm; OABI; gcc 4.6.3 with c++ support;
uclibc 0.9.31.1
others are unchanged

building is successful

test c++ program

int main()
{
    delete new int(2);
}

# arm-buildroot-linux-uclibc-g++ -static test.cpp
# qemu-arm ./a.out
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
Segmentation fault (core dumped)

noted that some other programs not involved new and delete run correctly

I'm not sure if this is gcc upstream problem, but post it here for
confirmation
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[Buildroot] bug report: c++ programs built by toolchain crash by seg fault

[Thomas Petazzoni]

Dear hayate,

On Tue, 5 Feb 2013 14:24:55 +0800, hayate wrote:

> arm little endian; generic arm; OABI; gcc 4.6.3 with c++ support;
> uclibc 0.9.31.1

Can you test with EABI?

Really OABI is deprecated. It would not be surprising at all that there
are issues with OABI.

Do you have a compelling reason to stick with OABI if you are making a
new toolchain?

Best regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[Buildroot] Fwd: bug report: c++ programs built by toolchain crash by seg fault

[hayate]

Forgot to mention maillist

---------- Forwarded message ----------
From: hayate <hayatelee@gmail.com>
Date: Tue, Feb 5, 2013 at 6:14 PM
Subject: Re: [Buildroot] bug report: c++ programs built by toolchain crash
by seg fault


I'll test it later.

It's a personal reason, because I have an old system that I cannot upgrade.
But since it's an explicit option there in buildroot still, I think it may
be a defect.

Regards,


On Tue, Feb 5, 2013 at 3:45 PM, Thomas Petazzoni <
thomas.petazzoni@free-electrons.com> wrote:

> Dear hayate,
>
> On Tue, 5 Feb 2013 14:24:55 +0800, hayate wrote:
>
> > arm little endian; generic arm; OABI; gcc 4.6.3 with c++ support;
> > uclibc 0.9.31.1
>
> Can you test with EABI?
>
> Really OABI is deprecated. It would not be surprising at all that there
> are issues with OABI.
>
> Do you have a compelling reason to stick with OABI if you are making a
> new toolchain?
>
> Best regards,
>
> Thomas
> --
> Thomas Petazzoni, Free Electrons
> Kernel, drivers, real-time and embedded Linux
> development, consulting, training and support.
> http://free-electrons.com
>
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[Buildroot] bug report: c++ programs built by toolchain crash by seg fault

[hayate]

gcc 4.6.3 with EABI is fine (as expected)


On Tue, Feb 5, 2013 at 3:45 PM, Thomas Petazzoni <
thomas.petazzoni@free-electrons.com> wrote:

> Dear hayate,
>
> On Tue, 5 Feb 2013 14:24:55 +0800, hayate wrote:
>
> > arm little endian; generic arm; OABI; gcc 4.6.3 with c++ support;
> > uclibc 0.9.31.1
>
> Can you test with EABI?
>
> Really OABI is deprecated. It would not be surprising at all that there
> are issues with OABI.
>
> Do you have a compelling reason to stick with OABI if you are making a
> new toolchain?
>
> Best regards,
>
> Thomas
> --
> Thomas Petazzoni, Free Electrons
> Kernel, drivers, real-time and embedded Linux
> development, consulting, training and support.
> http://free-electrons.com
>
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[Buildroot] bug report: c++ programs built by toolchain crash by seg fault

[Yann E. MORIN]

Hayate, All,

On Tuesday 05 February 2013 Thomas Petazzoni wrote:
> On Tue, 5 Feb 2013 14:24:55 +0800, hayate wrote:
> > arm little endian; generic arm; OABI; gcc 4.6.3 with c++ support;
> > uclibc 0.9.31.1
> 
> Can you test with EABI?
> 
> Really OABI is deprecated. It would not be surprising at all that there
> are issues with OABI.

What I would suggest when using technologies of the previous millenium, is
to use tools dating from the same era. Use a combo of {binutils,gcc,libc}
that were current at that time to build your toolchain.

Then, use that toolchain as an external toolchain for Buildroot.

Note however that, using too old components might not be possible either,
as Buildroot expects a toolchain with a sysroot, which is not something
that was available with now-very-old components.

YMMV, as they say.

Regards,
Yann E. MORIN.

-- 
.-----------------.--------------------.------------------.--------------------.
|  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___               |
| +33 223 225 172 `------------.-------:  X  AGAINST      |  \e/  There is no  |
| http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL    |   v   conspiracy.  |
'------------------------------^-------^------------------^--------------------'

[Buildroot] Fwd: bug report: c++ programs built by toolchain crash by seg fault

[Arnout Vandecappelle]

On 05/02/13 11:15, hayate wrote:
> It's a personal reason, because I have an old system that I cannot
> upgrade.

  If you're using buildroot, you're basically upgrading your system, 
right?  Or are you just using buildroot to create a compiler?


> But since it's an explicit option there in buildroot still, I
> think it may be a defect.

  True. We should deprecate OABI.


  Regards,
  Arnout

-- 
Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium           BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
GPG fingerprint:  7CB5 E4CC 6C2E EFD4 6E3D A754 F963 ECAB 2450 2F1F

[Buildroot] Fwd: bug report: c++ programs built by toolchain crash by seg fault

[hayate]

On Thu, Feb 7, 2013 at 7:48 AM, Arnout Vandecappelle <arnout@mind.be> wrote:

> On 05/02/13 11:15, hayate wrote:
>
>> It's a personal reason, because I have an old system that I cannot
>> upgrade.
>>
>
>  If you're using buildroot, you're basically upgrading your system, right?
>  Or are you just using buildroot to create a compiler?

I meant my embedded device is running an old linux system that I cannot
upgrade because some kernel modules were provided by vendors and private.

Hence I actually want to use buildroot to create a cross compiler for that,
not whole root filesystem

>
>
>  But since it's an explicit option there in buildroot still, I
>> think it may be a defect.
>>
>
>  True. We should deprecate OABI.


4.7.x is disabled explicitly, 4.6.x is not. So if buildroot cannot build a
working compiler for OABI, it is fine to disable 4.6.x too. Just need
somebody to confirm it.

>

 Regards,
>  Arnout
>
> --
> Arnout Vandecappelle                          arnout at mind be
> Senior Embedded Software Architect            +32-16-286500
> Essensium/Mind                                http://www.mind.be
> G.Geenslaan 9, 3001 Leuven, Belgium           BE 872 984 063 RPR Leuven
> LinkedIn profile: http://www.linkedin.com/in/**arnoutvandecappelle<http://www.linkedin.com/in/arnoutvandecappelle>
> GPG fingerprint:  7CB5 E4CC 6C2E EFD4 6E3D A754 F963 ECAB 2450 2F1F
>
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[Buildroot] bug report: c++ programs built by toolchain crash by seg fault

[hayate]

On Thu, Feb 7, 2013 at 6:15 AM, Yann E. MORIN <yann.morin.1998@free.fr>wrote:

> Hayate, All,
>
> On Tuesday 05 February 2013 Thomas Petazzoni wrote:
> > On Tue, 5 Feb 2013 14:24:55 +0800, hayate wrote:
> > > arm little endian; generic arm; OABI; gcc 4.6.3 with c++ support;
> > > uclibc 0.9.31.1
> >
> > Can you test with EABI?
> >
> > Really OABI is deprecated. It would not be surprising at all that there
> > are issues with OABI.
>
> What I would suggest when using technologies of the previous millenium, is
> to use tools dating from the same era. Use a combo of {binutils,gcc,libc}
> that were current at that time to build your toolchain.
>
> Then, use that toolchain as an external toolchain for Buildroot.


Actually I can build an old toolchain for my system, but I just really want
to use new gcc features (especially C++), if not 4.7, 4.6 is fine.

BTW, I tried crosstool-NG, but there are some building errors I cannot
solve in building glibc or uclibc.

>



Note however that, using too old components might not be possible either,
> as Buildroot expects a toolchain with a sysroot, which is not something
> that was available with now-very-old components.
>
> YMMV, as they say.
>
> Regards,
> Yann E. MORIN.
>
> --
>
> .-----------------.--------------------.------------------.--------------------.
> |  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics'
> conspiracy: |
> | +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___
>       |
> | +33 223 225 172 `------------.-------:  X  AGAINST      |  \e/  There
> is no  |
> | http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL    |   v
> conspiracy.  |
>
> '------------------------------^-------^------------------^--------------------'
>
>
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