[gfortran, testsuite] Fix bounds checking for substrings, enable bounds chekcing in dg testsuite, assorted fixes

[Tobias Schlüter]

Dorit Nuzman <DORIT@il.ibm.com> wrote on Sun, 10 Dec 2006:
>> WRT the rest of the discussion, I'd like to point out that -O3
>> -ftree-vectorize currently ICEs on a few testcases (PR30087), which is
>
> Does this patch fix the problem?:
> http://gcc.gnu.org/ml/gcc/2006-12/msg00267.html

I can't tell.  After a few days of not being able to bootstrap, I'm  
now running into trouble with the testsuite: the linker invoked in the  
testsuite doesn't find libgfortranbegin.

> To overcome the problem Andrew mentions here -
> http://gcc.gnu.org/ml/gcc-patches/2006-12/msg00532.html,
> you can look at how gcc.dg/vect/vect.exp computes which target options to
> use with -ftree-vectorize.

This looks very useful, thanks for the pointer.  Do you think that it  
makes sense to test gfortran with -ftree-vectorize or are vect  
testsuites comprehensive enough?

Thanks,
- Tobi

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