bootstrap/3067: Compilation with -fPIC -fexceptions fails, breaking bootstrap

bootstrap/3067: Compilation with -fPIC -fexceptions fails, breaking bootstrap

[marcus]

>Number:         3067
>Category:       bootstrap
>Synopsis:       Compilation with -fPIC -fexceptions fails, breaking bootstrap
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 06 15:26:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     marcus@roxen.com
>Release:        3.0 2001-05-21, 2001-05-28 and 2001-06-04
>Organization:
>Environment:
SunOS kronan.idonex.se 5.8 Generic_108529-03 i86pc i386 i86pc
>Description:
When compiling any code doing abort() with -fPIC and
-fexceptions (such as unwind-dw2.c for example), the
compiler produces a subtraction of two symbols in different
sections, prompting the assembler to say "Illegal subtraction"
and die.  It can be reproduced with a minial test program
like so:

kronan:~/build/gcc-20010521/gcc% cat foo.c
void foo()
{
  abort ();
}
kronan:~/build/gcc-20010521/gcc% ./xgcc -B./ -fPIC -fexceptions -c foo.c
Assembler: foo.c
        "/var/tmp/ccTfkQG7.s", line 48 : Illegal subtraction
kronan:~/build/gcc-20010521/gcc% 

I tested with the three most recent snapshots and got the
same result in all of them.

The generated assembler code for the trivial test program is
attached.  The offending line is the one that says

	.long	.LFB1-.
>How-To-Repeat:
Compilation of trivial program file as described above.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="foo.s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="foo.s"

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Re: bootstrap/3067: Compilation with -fPIC -fexceptions fails, breaking bootstrap

[ro]

Synopsis: Compilation with -fPIC -fexceptions fails, breaking bootstrap

State-Changed-From-To: open->closed
State-Changed-By: ro
State-Changed-When: Tue Jul  3 05:49:50 2001
State-Changed-Why:
    Fixed for 3.0.1:
    
    http://gcc.gnu.org/ml/gcc-patches/2001-06/msg01561.html

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=3067&database=gcc