[Bug target/86007] precompiled header on bdver2 with -march=native triggers a "created and used with differing settings of '-mlwp'" warning, intermittently

[stefantalpalaru at yahoo dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86007

--- Comment #4 from Ștefan Talpalaru <stefantalpalaru at yahoo dot com> ---
Mystery solved: half the CPU cores report LWP as disabled, the other half as
enabled.

Both at boot, as seen with "grep -E '(core id|lwp)' /proc/cpuinfo" and
afterwards, using the CPUID instruction: "cpuid | grep 'lightweight profiling
support'".

So, depending on which CPU core GCC runs on, "-march=native" will enable or not
"-mlwp".