On 15 April 2012 14:08, niXman wrote: > Hello list! > > When configuring gcc, I noticed that sometimes in '--enable-languages' > in addition to languages, 'lto' is also specified. > For what? Link-Time Optimisation is enabled automatically unless you say --disable-lto > Is it really necessary to specify 'lto' in the list of languages? I don't understand the question. It's not necessary for you to specify it, because it's added automatically. It's necessary for the configure script to add it if you want LTO support. If you don't want LTO support, configure with --disable-lto.