Bug? Why __seg_fs __seg_gs are visible while compiling through gcc and not while compiling through g++ (error) even if the statements are enclosed in 'extern "C" {...}' statements

Bug? Why __seg_fs __seg_gs are visible while compiling through gcc and not while compiling through g++ (error) even if the statements are enclosed in 'extern "C" {...}' statements

[gkourtis]

I think there is some sort of bug !!!

When I compile throught gcc __seg_gs is visible, while if I use g++ it 
is not !!!

Should it be like that ?

Re: Bug? Why __seg_fs __seg_gs are visible while compiling through gcc and not while compiling through g++ (error) even if the statements are enclosed in 'extern "C" {...}' statements

[Xi Ruoyao]

On Sat, 2023-07-15 at 16:01 +0300, gkourtis--- via Gcc-help wrote:
> I think there is some sort of bug !!!
> 
> When I compile throught gcc __seg_gs is visible, while if I use g++ it
> is not !!!
> 
> Should it be like that ?

https://gcc.gnu.org/PR69549

-- 
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University

Re: Bug? Why __seg_fs __seg_gs are visible while compiling through gcc and not while compiling through g++ (error) even if the statements are enclosed in 'extern "C" {...}' statements

[Jonathan Wakely]

On Sat, 15 Jul 2023 at 14:02, gkourtis--- via Gcc-help
<gcc-help@gcc.gnu.org> wrote:
>
> I think there is some sort of bug !!!
>
> When I compile throught gcc __seg_gs is visible, while if I use g++ it
> is not !!!
>
> Should it be like that ?


Enclosing code in extern "C" does not magically change the compiler to
be a C compiler, it just tells the C++ compiler to use C-style symbol
names and calling conventions for functions. It doesn't mean you can
use features that are not supported by the C++ compiler, because
you're still just compiling C++ code.

Re: Bug? Why __seg_fs __seg_gs are visible while compiling through gcc and not while compiling through g++ (error) even if the statements are enclosed in 'extern "C" {...}' statements

[Xi Ruoyao]

On Sun, 2023-07-16 at 12:42 +0300, gkourtis@freemail.gr wrote:
> Thanks for pointing out the known problem.
> By the way what should I have done on my own to detect the "known
> issue" ?
> As I did various searches without any result !

Use the "search" box at https://gcc.gnu.org/bugzilla/.

> George
> 
> Στις 15/7/23 16:08, ο/η Xi Ruoyao έγραψε:
> > On Sat, 2023-07-15 at 16:01 +0300, gkourtis--- via Gcc-help wrote:
> > > I think there is some sort of bug !!!
> > > 
> > > When I compile throught gcc __seg_gs is visible, while if I use
> > > g++ it
> > > is not !!!
> > > 
> > > Should it be like that ?
> > https://gcc.gnu.org/PR69549
> > 
> 

-- 
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University