https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69635
--- Comment #4 from Markus Trippelsdorf <trippels at gcc dot gnu.org> --- (In reply to h2+bugs from comment #3) > Thank you for the quick replies! > > > Did you build gcc6 with --enable-checking=release ? > > I am using the pre-built FreeBSD packages, I have checked, and it seems it > is not the case. That likely explains it... I will double-check with the > package maintainer. > > > You can speed up the build time by using -flto=<number of CPU cores>. > > Ah, that's very interesting! I hadn't seen -flto with a number yet. Is there > more documentation on it? Sure, in the compiler manual. > Is this the "WHOPR" mode described here: > https://gcc.gnu.org/onlinedocs/gccint/LTO-Overview.html ? > I had previously thought flto was only useful when linking multiple > translation units... Does it have an effect on the produced binary? For a single translation unit generally no. It just runs some optimizations and the code generation in parallel, hence the speedup.
