begin using attribute_hidden

[Peter S. Mazinger]

On Mon, 7 Nov 2005, Joakim Tjernlund wrote:

> > -----Original Message-----
> > From: uclibc-bounces at uclibc.org 
> > [mailto:uclibc-bounces at uclibc.org] On Behalf Of Peter S. Mazinger
> > Sent: 07 November 2005 09:59
> > To: uclibc at uclibc.org
> > Subject: RFC: begin using attribute_hidden
> > 
> > Hello!
> > 
> > What about start using attribute_hidden like:
> > 
> > attribute_hidden __x () {
> > }
> > 
> > strong_alias(__x,x)
> 
> hehe, I just replied to your previous mail, suggesting this :)

Found this in a glibc internal header , could be used here too

/* The following macros are used for PLT bypassing within libc.so
   (and if needed other libraries similarly).
   First of all, you need to have the function prototyped somewhere,
   say in foo/foo.h:

   int foo (int __bar);

   If calls to foo within libc.so should always go to foo defined in libc.so,
   then in include/foo.h you add:

   libc_hidden_proto (foo)

   line and after the foo function definition:

   int foo (int __bar)
   {
     return __bar;
   }
   libc_hidden_def (foo)

   or

   int foo (int __bar)
   {
     return __bar;
   }
   libc_hidden_weak (foo)

   Simularly for global data. If references to foo within libc.so should
   always go to foo defined in libc.so, then in include/foo.h you add:

   libc_hidden_proto (foo)

   line and after foo's definition:

   int foo = INITIAL_FOO_VALUE;
   libc_hidden_data_def (foo)

   or

   int foo = INITIAL_FOO_VALUE;
   libc_hidden_data_weak (foo)

   If foo is normally just an alias (strong or weak) of some other function,
   you should use the normal strong_alias first, then add libc_hidden_def
   or libc_hidden_weak:

   int baz (int __bar)
   {
     return __bar;
   }
   strong_alias (baz, foo)
   libc_hidden_weak (foo)

   If the function should be internal to multiple objects, say ld.so and
   libc.so, the best way is to use:

   #if !defined NOT_IN_libc || defined IS_IN_rtld
   hidden_proto (foo)
   #endif

   in include/foo.h and the normal macros at all function definitions
   depending on what DSO they belong to.

-- 
Peter S. Mazinger <ps dot m at gmx dot net>           ID: 0xA5F059F2
Key fingerprint = 92A4 31E1 56BC 3D5A 2D08  BB6E C389 975E A5F0 59F2