[Bug ld/23078] Weak alias to a weak symbol is not resolved correctly.

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23078

Alan Modra  changed:

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 CC||amodra at gmail dot com
 Resolution|--- |INVALID

--- Comment #3 from Alan Modra  ---
Not a linker bug, and original reporter has probably figured out what is wrong
with his code by now.  In an case, asking binutils developers how to use gcc
features via a bug report is not appropriate.

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[Bug ld/23078] Weak alias to a weak symbol is not resolved correctly.

[pftbest at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23078

--- Comment #2 from Vadzim Dambrouski  ---
Hello Nick,

Thank you for suggestion, I've tried weakref, and does help with the case I
have posted above, but it still doesn't do exactly what I need.

Here is updated code:

// main.c ---

void _start() {}

void DEFAULT_HANDLER() {
  *((int*)0x10) = 5;
}

void BUS_FAULT() {
  *((int*)0x10) = 7;
}

// foo.c 

__attribute__((weak)) void DEFAULT_HANDLER() {
*((int*)0x10) = 1;
}

static __attribute__((weakref ("DEFAULT_HANDLER"))) void HARD_FAULT();
static __attribute__((weakref ("DEFAULT_HANDLER"))) void BUS_FAULT();

void (*VECTORS[])() = {
HARD_FAULT,
BUS_FAULT,
};

// --

In this new example I have created a strong symbols for both default handler
and for one of specific handlers. I expect that VECTORS table would contain
pointers to functions 5 and 7, but in practice it contains pointers to 5 and 5.
This is not what I need, unfortunately.

Regards,
Vadzim

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[Bug ld/23078] Weak alias to a weak symbol is not resolved correctly.

[nickc at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23078

Nick Clifton  changed:

   What|Removed |Added

 CC||nickc at redhat dot com

--- Comment #1 from Nick Clifton  ---
Hi Vadzim,

> VECTORS array points to a weak function instead of a strong function defined
> in main.c

I think that this is a bug in your test code.  You should be using the
weakref attribute here, rather than the weak and alias attributes.  IE:

  static __attribute__((weakref ("DEFAULT_HANDLER"))) void HARD_FAULT ();

and similarly for BUS_FAULT.

Cheers
  Nick

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