Stefan Krah added the comment:

The issue here is that the BASECFLAGS variable contains the mysterious 
option -Olimit 1500, which makes the X87_DOUBLE_ROUNDING test fail (i.e. 
X87_DOUBLE_ROUNDING is set to true when it should be false).

When BASECFLAGS is unset, test_float passes.

-Olimit gives problems with at least icc, suncc and HP C/aC++. So
propose to make this an -Olimit issue instead.

components: +Build -Tests
keywords: +buildbot
stage:  -> needs patch
title: test_float failure on IA64 (HPUX) -> -Olimit: unsupported option: 
warnings and ./configure failures
versions: +Python 3.3, Python 3.4

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