On 9/23/19 9:23 AM, Thomas Monjalon wrote: [...] > Please can we get some numbers to understand how longer it is?
Below numbers are for make based (make -j8) clean build on my system: non-LTO real: 144.56s, user:451.81s, sys:48.46s, CPU:346% LTO real: 607.20s, user:2141.71s, sys:88.36s, CPU:367% So it is similar ~5x increase as Mattias has reported. Have not measured it, but the lion share of that increase is due to linking of 'test' apps. I would vote for leaving LTO as an option - although I must admit I did not get what Ray meant by saying: 20/09/2019 09:38, Ray Kinsella: [...] > I would just like to see it in or out, not another build time option. If "in or out" means "either accept the patches with LTO on and no config option or reject them" then I disagree. Even if run time improvements are questionable I find the additional link time warnings beneficial and would like to have an easy way to turn them on when doing final touches before pushing out. Regards Andrzej
