https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86007
Bug ID: 86007 Summary: precompiled header on bdver2 with -march=native triggers a "created and used with differing settings of '-mlwp'" warning, intermittently Product: gcc Version: 8.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: pch Assignee: unassigned at gcc dot gnu.org Reporter: stefantalpalaru at yahoo dot com Target Milestone: --- I came upon this bug in a more complex case, when compiling Natron on Gentoo ~amd64 when the PCH compilation warning turned into a "one or more PCH files were found, but they were invalid" error later on: https://github.com/4nykey/4nykey/issues/20 I managed to come up with a simple test case replicating only the warning, intermittently: https://gist.github.com/stefantalpalaru/3e984cf56c2eea462ae761143e0d0dfd I hope it's enough to figure out why -march=native can fail to detect LWP when creating the precompiled header on my FX-8320E. It might be related to this builtin arch detection bug that is also manifested on my CPU: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85591