Date: Fri, 05 Feb 2021 07:39:18 +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-FVhbfC2sJq@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-251570-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251570 Mark Millard <marklmi26-fbsd@yahoo.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |marklmi26-fbsd@yahoo.com --- Comment #5 from Mark Millard <marklmi26-fbsd@yahoo.com> --- My files analogous to src.conf or src-env.conf for cross building (amd64->???) via system clang have lines like: XCFLAGS+= -mcpu=cortex-a72 XCXXFLAGS+= -mcpu=cortex-a72 # There is no XCPPFLAGS but XCPP gets XCFLAGS content. ACFLAGS.arm64cpuid.S+= -mcpu=cortex-a72+crypto ACFLAGS.aesv8-armx.S+= -mcpu=cortex-a72+crypto ACFLAGS.ghashv8-armx.S+= -mcpu=cortex-a72+crypto I've only experimented with such specific control for cortex-a7, cortex-a53, cortex-a57, and cortex-a72, i.e., the armv7 and aarch64 systems that I've had access to, not targetting powerpc64, powerpc, or amd64. -mcpu= implicitly picks the matching -march= value and also sets the -mtune= value. The A53, A57, and A72 share the same -march= (armv8-a if I remember the command line notation correctly) but can have very different tuning. (In part this is because the A53 does not do many things that the architecture allows, such as: it only executes in order.) I've not dealt with using the release script in years, so I make no specific claims for that context. And even for just use with make, the above probably steps into "you are on your own" space. But at the time I adopted the technique, I did not find any way to avoid that status while doing the targeting via the style of build. I've not had any troubles attributed to the above. -- You are receiving this mail because: You are the assignee for the bug.help
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