[Bug gdb/30912] Regression: make check TESTS="gdb.base/gcore.exp" RUNTESTFLAGS="--target_board=native-extended-gdbserver"

["jhb at FreeBSD dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30912

jhb at FreeBSD dot org changed:

           What    |Removed                     |Added
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                 CC|                            |jhb at FreeBSD dot org

--- Comment #5 from jhb at FreeBSD dot org ---
Sorry I didn't see this earlier for some reason, yes, this is related to the
fact that when using gdbserver, GDB doesn't know what layout to use when
writing out a core dump.

The long term solution is to pull the CPUID info from gdbserver in the form of
NT_X86_CPUID, but in the short term we could just always use the Intel layout
that GDB assumed before the XSAVE series.  That is, we could pick a default
layout based on the XCR0 mask that corresponds to one of the known sizes and
use that to set both the layout and size.  I'll see if I can't come up with a
variant of that today or tomorrow.

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