Date: Sun, 23 Sep 2018 16:42:23 +0000 From: bugzilla-noreply@freebsd.org To: ports-bugs@FreeBSD.org Subject: [Bug 221297] lang/go: Fix arm build Message-ID: <bug-221297-7788-8N9yrpLGBX@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-221297-7788@https.bugs.freebsd.org/bugzilla/> References: <bug-221297-7788@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D221297 Yuval Pavel Zholkover <paulzhol@gmail.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |paulzhol@gmail.com --- Comment #12 from Yuval Pavel Zholkover <paulzhol@gmail.com> --- Hi, I maintain the FreeBSD/arm builder, I just wanted to add some quick notes: As per https://golang.org/doc/install/source#go14, when go 1.4 is used as t= he bootstrap toolchain, you must set CGO_ENABLED=3D0. Also it's recommended to use https://dl.google.com/go/go1.4-bootstrap-20171003.tar.gz or the git branch release-branch.go1.4 directly. In release-branch.go1.4 CGO_ENABLED=3D0 is set by default since: https://github.com/golang/go/commit/94221a06124fe0d0f7ed45a355c72e46ed0e891= b. GOARM=3D7 is required when running on a multi-core processor. This is becau= se the dmb instruction is used for memory barriers in various points, and it is an ARMv7 instruction (the ARMv6 variant "mcr p15, 0, %0, c7, c10, 5" was deemed too slow and wasn't used). The check is performed at _runtime_, the dmb instruction is always compiled= in. For GOARM < 7 the dmb instruction is skipped as it is assumed to be single-= core system - this is tested at startup and you get the "runtime: this system has multiple CPUs and must use atomic synchronization instructions. Recompile u= sing GOARM=3D7." message otherwise. --=20 You are receiving this mail because: You are the assignee for the bug.=
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