[mercury-users] segmentation violation with wrong syntax sources

[Julien Fischer]

On Tue, 29 Jun 2010, Julien Fischer wrote:

> On Tue, 29 Jun 2010, Peter Wang wrote:
>
>> On 2010-06-29, Paul Bone <pbone at csse.unimelb.edu.au> wrote:
>>> On Tue, Jun 29, 2010 at 11:03:13AM +1000, Peter Wang wrote:
>>>> 
>>>> Of course, the compiler should not crash anyway.  This is a known
>>>> problem when installing from the precompiled sources on a x86-64 machine
>>>> (bug #115).
>>> 
>>> I'm not sure that that's the problem.
>> 
>> It is.
>> 
>>> Why would it segfault for Jean-Marc but
>>> report an error for us?  Is his version not catching the syntax error and
>>> crashing at some later stage?
>> 
>> It happens if you install from the pre-generated sources in the tarball,
>> without a previous version of the compiler available.  There seems to be
>> some confusion about the number of tag bits to use on a 64-bit platform;
>> I didn't get further than that.
>
> I have had a quick further look:
>
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 0x7f789895e6e0 (LWP 11051)]
> 0x0000000000c93c4f in lexer_module34 () at lexer.c:11833
> 11833           MR_COMPUTED_GOTO((MR_Unsigned) MR_r3,
>
> At a guess, some of the code we generate for switches is not portable,
> i.e. it doesn't respect --cross-compiling.  I'll try rebuilding the
> source dist. C files using --no-smart-indexing and see if that makes the
> problem go away.

Ok, that fixes it.  I'll add --no-smart-indexing to the source
distribution flags for the time being and update the bug entry.

Julien.
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