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Date:      Fri, 05 Feb 2021 08:53:08 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 251570] Release script passes CPUTYPE variable to both host and target build from MAKE_CONF file
Message-ID:  <bug-251570-227-nXVcY5MIqx@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-251570-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-251570-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D251570

--- Comment #6 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #5)

By the way, for self hosted (not cross builds) I use
the likes of:

# Use of the .clang 's here avoids
# interfering with other C<?>FLAGS
# usage, such as ?=3D usage.
CFLAGS.clang+=3D -mcpu=3Dcortex-a72
CXXFLAGS.clang+=3D -mcpu=3Dcortex-a72
CPPFLAGS.clang+=3D -mcpu=3Dcortex-a72
ACFLAGS.arm64cpuid.S+=3D  -mcpu=3Dcortex-a72+crypto
ACFLAGS.aesv8-armx.S+=3D  -mcpu=3Dcortex-a72+crypto
ACFLAGS.ghashv8-armx.S+=3D        -mcpu=3Dcortex-a72+crypto

This requires that the the implicit -march=3D value
to be compatible with the host.

(I've never faced a context with strongly related
-march values, such as a -march=3Darmv8-a host trying
to compile to target -march=3Darmv8.2-a instruction
set extensions that an armv8-a would reject. TARGET
and TARGET_ARCH are not that detailed but determine
what is considered a cross-build in the build
system.)

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