Re: [Gcl-devel] Windows GCL: setjmp/longjmp

[Camm Maguire]

Greetings!  As a first pass, could someone please check both the two
ansi build failures and the maxima ignore-errors issue when the
underlying gcl has been built with --enable-debug?  It would also be
interesting in addition to add -fvolatile to all CFLAGS.  One should
be able to simply set the CFlAGS env variable before configure, and
find one's setting in all FLAGS variables in the makedefs.

Take care,

"Mike Thomas" <address@hidden> writes:

> Hi all.
> 
> Here is a question:
> 
> | The
> | values of all variables (except register variables) that are accessible to
> | the routine receiving control contain the values they had when longjmp was
> | called. The values of register variables are unpredictable. The value
> | returned by setjmp must be nonzero. If value is passed as 0, the
> | value 1 is
> | substituted in the actual return.
> |
> | Call longjmp before the function that called setjmp returns; otherwise the
> | results are unpredictable.
> |
> | Observe the following restrictions when using longjmp:
> |
> | Do not assume that the values of the register variables will remain the
> | same. The values of register variables in the routine calling
> | setjmp may not
> | be restored to the proper values after longjmp is executed.
> 
> 
> My understanding is that any local variable is likely to be a register
> variable as most compilers these days ignore programmer usage of the
> register storage modifier.
> 
> Is that true?
> 
> If so, then format.c looks like a good place to start looking for trouble
> with setjmp/longjmp.
> 
> Unfortunately, so far I haven't been able to come up with a format statement
> which causes a problem.
> 
> Cheers
> 
> Mike Thomas.
> 
> 
> 
> 
> 
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> 
> 

-- 
Camm Maguire                                            address@hidden
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