help on fucntion visibility

help on fucntion visibility

[Irene (Shi Ying) Huang]

hi, 

I know that the current version gcc supports function visibility
attributes, yet some of the previous versions does not. 

Could any one kindly tell since which version is visibility attribute
supported by gcc? So that I will be able to write some conditional
macros definition code to make things more flexible? 

The macro definition is supposed to be something like:
#if ((__GNUC__ *100 +__GNUC_MINOR__) >= 303)
#define G_GNUC_INTERNAL __attribute__((visibility("hidden")))
#else
#define G_GNUC_INTERNAL
#endif

Thanks in advance. 

--Irene

Re: help on fucntion visibility

[Artūras Moskvinas]

> 
> I know that the current version gcc supports function visibility
> attributes, yet some of the previous versions does not. 
> 
> Could any one kindly tell since which version is visibility attribute
> supported by gcc? So that I will be able to write some conditional
> macros definition code to make things more flexible? 
> 
> The macro definition is supposed to be something like:
> #if ((__GNUC__ *100 +__GNUC_MINOR__) >= 303)
> #define G_GNUC_INTERNAL __attribute__((visibility("hidden")))
> #else
> #define G_GNUC_INTERNAL
> #endif
> 
Look at this wiki entry for checking visibility(a macros is already
there...):
http://gcc.gnu.org/wiki/Visibility

And by reading manual, you will find, that visibility attribute appeared
in 3.3 release (earlier compiler do not have this option documented in
manual)


Arturas M.

Re: help on fucntion visibility

[Irene (Shi Ying) Huang]

Thanks Artūras

Is the macro you mention about HAVE_GCCVISIBILITYPATCH? If it is an
official macro, where can I find the documentation for it? 

Thanks again :) 

--Irene

On Wed, 2006-12-06 at 10:51 +0200, Artūras Moskvinas wrote:
> 
> > 
> > I know that the current version gcc supports function visibility
> > attributes, yet some of the previous versions does not. 
> > 
> > Could any one kindly tell since which version is visibility attribute
> > supported by gcc? So that I will be able to write some conditional
> > macros definition code to make things more flexible? 
> > 
> > The macro definition is supposed to be something like:
> > #if ((__GNUC__ *100 +__GNUC_MINOR__) >= 303)
> > #define G_GNUC_INTERNAL __attribute__((visibility("hidden")))
> > #else
> > #define G_GNUC_INTERNAL
> > #endif
> > 
> Look at this wiki entry for checking visibility(a macros is already
> there...):
> http://gcc.gnu.org/wiki/Visibility
> 
> And by reading manual, you will find, that visibility attribute appeared
> in 3.3 release (earlier compiler do not have this option documented in
> manual)
> 
> 
> Arturas M.