[Bug-gsl] [bug #39171] make check errors with gcc -ffast-math (or default Intel icc)

[Patrick Alken]

URL:
  <http://savannah.gnu.org/bugs/?39171>

                 Summary: make check errors with gcc -ffast-math (or default
Intel icc)
                 Project: GNU Scientific Library
            Submitted by: psa
            Submitted on: Wed 05 Jun 2013 09:14:48 PM GMT
                Category: Performance
                Severity: 3 - Normal
        Operating System: 
                  Status: Confirmed
             Assigned to: None
             Open/Closed: Open
                 Release: 
         Discussion Lock: Any

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Details:

GSL will not pass make check with the -ffast-math flag passed to gcc.
Similarly, Intel's icc default configuration for -O2 includes -ffast-math
behavior and also fails (see bug #39152).

The document
https://secure-software.intel.com/sites/default/files/article/326703/fp-control-2012-08.pdf
contains a decent description of the various optimizations turned on by
-ffast-math and the default icc configuration.

Getting GSL to pass make check with -ffast-math will most likely be a long and
difficult project, involving rewrites of various routines to perform more
consistently with these optimizations.

It is unclear if the effort is worth the reward, but this bug can be left open
to track the issue.




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