[cfe-users] optimizations that raise the FP exception flag

[Peter van Hoof]

Hi,

I wonder if clang++ allows optimizations that could raise the FP 
exception flag in its default setup? For our code this would be a 
problem since we trap certain FP exceptions. Hence such optimizations 
would lead to a crash of the code. We have seen this happening with this 
version of clang++

$ clang++ --version
clang version 3.3 (trunk 179781)
Target: i386-pc-linux-gnu
Thread model: posix

If such optimizations are allowed, we need a way to disable them. Gcc 
has the -ftrapping-math flag to achieve this. Clang++ seems to accept 
this flag, but it didn't have any effect in the case we studied. Would 
this be the correct way to disable such optimizations?


Cheers,

Peter.

-- 
Peter van Hoof
Royal Observatory of Belgium
Ringlaan 3
1180 Brussel
Belgium
http://homepage.oma.be/pvh