Translations:Binary package guide/156/en

Optionally, it is also possible to set  or   to tell gcc to tune code to a specific arch. In contrast to, the   argument does not prevent code from being executed on other processors. For example, to compile code which is compatible with ivybridge and up but is tuned to run best on skylake set CFLAGS to. When  is not set it defaults to whatever   is set to.