On Fri, 9 Apr 2021 at 19:57, Jonathan Brandmeyer wrote: > > We're using GCC v9.3.0 on a newer laptop, as packaged by Ubuntu for > 20.04 LTS. Our build for host-native tools naturally enables > cpu-specific optimization with `-march=native`. The gcc driver is > passing -march=tigerlake down to cc1 (or cc1plus). The driver > program's auto-detection is correct in that this is tiger lake > hardware. However, it is not supported in this release of GCC. How have you got a gcc driver that disagrees with cc1 about what is supported? They're supposed to come from the same release. > How exactly is the driver coming up with this code name? I'd like to > keep the Makefile set up as-is for the whole team. Can we override > the definition of `native` through an environment variable or > something? Ice lake client optimizations and instruction selection > appear to be working for our usage. We can modify the Makefile to be > sensitive to an environment variable, but I'm wondering if GCC itself > can also be overridden in this way. Can't you just use -march=icelake instead of -march=native?
