RE: segmentation fault - ReadList.com

5 msg	Re: PATCH COMMITTED: Don't break tests for enum...
2 msg	hash_rtx and volatile subexpressions
2 msg	Any interest in i586-pc-interix3 configuration ...
11 msg	[rfc] Moving bbs back to pools
1 msg	gcc-4.2-20070606 is now available
1 msg	dataflow branch merge plans.
4 msg	[bug] undefined symbols with -Woverloaded-virtu...
2 msg	how to build executable instructions blocks dyn...
1 msg	gcj java help
4 msg	Creating a patch ready for gcc-patches list
29 msg	use of %n in genmodes.c causes trouble on Vista
2 msg	linking problem with boost

segmentation fault
\ fred.cotton (5 Jun 2007)
. \ Ben Elliston (6 Jun 2007)
. \ Dave Korn (6 Jun 2007)

10 msg	Something weird with cp/decl.c switch statement
3 msg	vector compare
3 msg	Bootstrap failure on ppc64
7 msg	libjava is a train wreck.
1 msg	Re: Comments for empty for-loop parts (was Re: ...
1 msg	gcc-4.1-20070604 is now available
6 msg	testsuite trigraphs.c failure due to cygwin <...

Subject:	RE: segmentation fault
Group:	Gcc
From:	Dave Korn
Date:	6 Jun 2007

On 05 June 2007 16:49, fred.cotton wrote:

> With apologies for being new:
> In porting a hardware configuration from gcc-3.4.1 to gcc-4.2.0, I'm
> getting the following error message:
>
> In file included from /cygdrive/c/gcc-4.2.0/gcc/crtstuff.c:68:
> /cygdrive/c/gcc-4.2.0/gcc/tsystem.h:53: internal compiler error:
> Segmentation fault.
>
> Lines 52-54 of tsystem.h are:
>
> #ifndef malloc
> extern void *malloc (size_t);
> #endif
>
> If I remove these lines, all the other extern statements fail also.
> What precisely does Segmentation fault mean in this context? Is it
> referring to the underlying Windows XP?

It's a memory-protection error, usually indicating you have dereferenced a NULL pointer or otherwise tried to access an unmapped memory address.

> What sort of compiler, configuration or operating system parameters could
> be the cause?
> Where should I be looking?

Almost certainly your backend is dereferencing a pointer without realising it's NULL at the time. Given the association with extern decls, do you implement a TARGET_ENCODE_SECTION_INFO macro?

cheers,
DaveK
--
Can't think of a witty .sigline today....