[SciPy-dev] specfun compile errors on windows

Pearu Peterson pearu at scipy.org
Mon Jan 19 15:25:59 CST 2004

On Mon, 19 Jan 2004, Travis Oliphant wrote:

> Pearu Peterson wrote:
> >One possible workaround that might be worth to try is to separate the two 
> >offending functions (RMN2L and ASWFB) in specfun.f to two different
> >files (rmn2l.f and aswfb.f). Hopefully, g77 will compile them with -O3.
> >If not, then at least the sizes of files are much smaller in order
> >to find a workaround.
> >
> I have taken aswfb  out of the specfun file and now the rest of the 
> specfun.f file compiles normally.  The extracted subroutine still gives 
> the error which I will submit to the gcc bug database.

Have you played with the loops and the code of this function?
May be recoding with a different style might cause g77 to succeed?

> It would appear that it is -O3 and -funroll-loops flags together that 
> give the problem (any other combination of the flags does not seem to 
> reproduce the error for me).

If that is the case then we can disable -funroll-loops instead of -O3
for bugy gcc versions, -O3 should be more useful than unrolling loops. 
This is very simple in build_flib.py. Could you sum up under which 
conditions the compiler bug appears? The following information should be 

g77 --version # only the version numbers when there is a failure
              # and when not.

Then I can make a patch to build_flib.py to resolve this issue.

> What error are you getting on rmn21.f ?

I took this information from


> I don't see any error there.



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