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I reproduced this on an ubuntu system. My quick fix suggestion is to use clang which does not have the bug (it's a standard package in ubuntu now). It seems to be a gcc 4.6.1 bug in 32-bit mode only (works fine with -m64). I imagine if you were motivated you should file a ubuntu fault since you already have the test script (they will pass it upstream after they have verified it if you aren't brave enough to talk to the gcc guys directly). Tim On Fri, Dec 2, 2011 at 3:24 PM, Edward L. Chapin <[log in to unmask]> wrote: > > Despite finally getting starlink to build on my 32bit Ubuntu 11.10 machine, > I started running into some odd run-time problems. > > I narrowed it down to some sort of problem comparing double-precision > variables with constants when I use the -std=c99 compiler flag. > > I've attached a minimal test program to this mail to demonstrate the problem > -- see the comments at the top for examples of the gcc calls that I do and > the output. > > I guess the solution is to drop the -std=c99, although it would be > interesting to know why this happens. > > Ed