[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] New: Weak alias to a weak symbol is not resolved correctly.

[pftbest at gmail dot com]

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

Bug ID: 23078
   Summary: Weak alias to a weak symbol is not resolved correctly.
   Product: binutils
   Version: 2.29
Status: UNCONFIRMED
  Severity: normal
  Priority: P2
 Component: ld
  Assignee: unassigned at sourceware dot org
  Reporter: pftbest at gmail dot com
  Target Milestone: ---

Created attachment 10957
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10957=edit
Archive with code to reproduce this issue.

Example code

// main.c ---

void _start() {}

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

// foo.c 

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

__attribute__((weak, alias("DEFAULT_HANDLER"))) void HARD_FAULT();
__attribute__((weak, alias("DEFAULT_HANDLER"))) void BUS_FAULT();

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

// compile with ---

gcc -Os -o main.o -c main.c
gcc -Os -o foo.o -c foo.c
ld main.o foo.o
objdump -d -j .text -j .data a.out > dump.txt

// 

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

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