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[Bug-gsl] [bug #39171] make check errors with gcc -ffast-math (or defaul

From: Patrick Alken
Subject: [Bug-gsl] [bug #39171] make check errors with gcc -ffast-math (or default Intel icc)
Date: Wed, 05 Jun 2013 21:14:49 +0000
User-agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:21.0) Gecko/20100101 Firefox/21.0


                 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
         Discussion Lock: Any



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
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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