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Subject: [Bug 215600] devel/powerpc64-gcc based buildkernel:
 sys/powerpc/powerpc/db_trace.c rejected for: '__builtin_frame_address' with a
 nonzero argument is unsafe
Date: Mon, 02 Jan 2017 20:25:13 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D215600

--- Comment #2 from Mark Millard <markmi@dsl-only.net> ---
[Just recording John Baldwin's note about the issue in bugzilla.]

In:

https://lists.freebsd.org/pipermail/freebsd-toolchain/2017-January/002542.h=
tml

John Baldwin wrote the following:


From: John Baldwin . . .
. . .
Date: January 2, 2017 at 8:07:57 AM PST
. . .
Try using '0' instead of '1'.  You might get an extra frame in the backtrace
compared to before.  A simple way to test is to add 'options KDB_TRACE' and
then trigger a panic (e.g. sysctl debug.kdb.panic=3D1)


Side note by Mark Millard:

I've no clue if this is the direction that the powerpc64 (and powerpc)
FreeBSD folks want to go/investigate for the compiler's report or not.

As stands I'm using WERROR=3D to allow the buildkernel to complete.

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