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From: Michael Shmulevich <michaels@jungo.com>
To: Ralf Baechle <ralf@oss.sgi.com>
Cc: Ian Thompson <iant@palmchip.com>, linux-mips@oss.sgi.com
Subject: Re: binutils 2.8.1 problems
Date: Tue, 08 May 2001 10:36:34 +0300	[thread overview]
Message-ID: <3AF7A202.6060705@jungo.com> (raw)
In-Reply-To: 20010505145344.B1252@bacchus.dhis.org

> So then is a binutils and not a compiler problem.  What binutils are you
> using?  Binutils 2.8.1 which I'm still recommending (mostly to avoid
> sending people into a maze of version dependencies) is getting dated and
> the bug may well have been fixed in the meantime.

I have met a weird bug in binutils 2.8.1 on mips lately: when using 
".weak" directive in some module which make use of the same asliased 
symbol, during linkage the symbol doesn't get relocated to a "strong" 
symbol:

----------------------
in foo.c:
----------------------
extern void bar();

void foo(){
  printf("A\n");
}
__asm__(".weak bar; bar = foo");

void f1(){
   bar();
}

-----------------------
in bar.c:
----------------------
void bar(){
   printf("B\n");
}
----------------------
in main.c:
----------------------
extern void bar();
extern void f1();

int main(){
  f1();
  bar();
}
-----------------------

This code produce printout of
A
B
since f1() always calls foo() no matter that bar() is defined outside.
AFIAIK, there is no ".weakext" macro in 2.8.1.

Using objdump on foo.o I see there is no relocation entry for bar, 
however using gas-2.10 on exactly same assembly does produce relocation 
entry. So it must definitely be a "gas" problem.

Sincerely yours,
Michael Shmulevich
______________________________________
Software Developer
Jungo - R&D
email: michaels@jungo.com
web: http://www.jungo.com
Phone: 1-877-514-0537(USA)  +972-9-8859365(Worldwide) ext. 233
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      reply	other threads:[~2001-05-08  7:37 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-05-02 23:31 Debug format problem with -ggdb flag Ian Thompson
2001-05-05 17:53 ` Ralf Baechle
2001-05-08  7:36   ` Michael Shmulevich [this message]

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