[geos-devel] Numerical stability and -ffloat-store flag

strk strk at keybit.net
Wed Apr 15 10:17:12 EDT 2009

Some of you may remember the numerical stability issue
I've been struggling with 3 years ago:

That problem shows up again now that I added a testcase
for buffering operation taken from JTS repository:

The test succeeds on a 64bit system, fails on a 32bit one, adding
this other variable to the already complex situation.

Both me and Mateusz confirmed adding -ffloat-store to CFLAGS
fixed the run on 32bit system too, so I suggest we add
that flag by default, for improved numerical stability, when
available in the compiler.

Ok for everyone ? 


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