$ emerge -va '>> Verifying ebuild manifests >>> Running pre-merge checks for dev-lang/go-1.7.5 >>> Emerging (1 of 1) dev-lang/go-1.7.5::gentoo_prefix * go-darwin-amd64-bootstrap.tbz SHA256 SHA512 WHIRLPOOL size ;-) ... [ ok ] >>> Downloading 'http://distfiles.gentoo.org/distfiles/go1.7.5.src.tar.gz' --2017-02-22 15:33:16-- http://distfiles.gentoo.org/distfiles/go1.7.5.src.tar.gz Resolving distfiles.gentoo.org (distfiles.gentoo.org)... 64.50.233.100, 216.165.129.135, 137.226.34.46, ... Connecting to distfiles.gentoo.org (distfiles.gentoo.org)|64.50.233.100|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 14204325 (14M) [application/x-gzip] Saving to: '/opt/gentoo/var/cache/portage/dist/go1.7.5.src.tar.gz' /opt/gentoo/var/cac 100%[===================>] 13.55M 3.82MB/s in 4.2s 2017-02-22 15:33:21 (3.26 MB/s) - '/opt/gentoo/var/cache/portage/dist/go1.7.5.src.tar.gz' saved [14204325/14204325] * go1.7.5.src.tar.gz SHA256 SHA512 WHIRLPOOL size ;-) ... [ ok ] >>> Unpacking source... >>> Unpacking go-darwin-amd64-bootstrap.tbz to /Volumes/Scratch/tmp/portage/dev-lang/go-1.7.5/work >>> Unpacking go1.7.5.src.tar.gz to /Volumes/Scratch/tmp/portage/dev-lang/go-1.7.5/work >>> Source unpacked in /Volumes/Scratch/tmp/portage/dev-lang/go-1.7.5/work >>> Preparing source in /Volumes/Scratch/tmp/portage/dev-lang/go-1.7.5/work/go ... >>> Source prepared. >>> Configuring source in /Volumes/Scratch/tmp/portage/dev-lang/go-1.7.5/work/go ... >>> Source configured. >>> Compiling source in /Volumes/Scratch/tmp/portage/dev-lang/go-1.7.5/work/go ... * GOROOT_BOOTSTRAP is /Volumes/Scratch/tmp/portage/dev-lang/go-1.7.5/work/go-darwin-amd64-bootstrap ##### Building Go bootstrap tool. cmd/dist ##### Building Go toolchain using /Volumes/Scratch/tmp/portage/dev-lang/go-1.7.5/work/go-darwin-amd64-bootstrap. bootstrap/internal/sys bootstrap/asm/internal/flags bootstrap/compile/internal/big bootstrap/internal/bio bootstrap/internal/gcprog bootstrap/internal/obj bootstrap/internal/obj/arm64 bootstrap/internal/obj/arm bootstrap/internal/obj/s390x bootstrap/internal/obj/ppc64 bootstrap/internal/obj/mips bootstrap/internal/obj/x86 bootstrap/asm/internal/lex bootstrap/link/internal/ld bootstrap/compile/internal/ssa bootstrap/asm/internal/arch # bootstrap/asm/internal/arch fatal error: unexpected signal during runtime execution [signal 0xb code=0x1 addr=0xb01dfacedebac1e pc=0x1ed59] runtime stack: runtime.throw(0x45f880, 0x2a) /tmp/go-darwin-amd64-bootstrap/src/runtime/panic.go:527 +0x90 runtime.sigpanic() /tmp/go-darwin-amd64-bootstrap/src/runtime/sigpanic_unix.go:12 +0x5a runtime.(*gcWork).put(0xc820040720, 0xc82131e000) /tmp/go-darwin-amd64-bootstrap/src/runtime/mgcwork.go:87 +0x49 runtime.greyobject(0xc82131e000, 0x0, 0x0, 0xc81ff670ff, 0x0, 0xbd5118, 0xc820040720) /tmp/go-darwin-amd64-bootstrap/src/runtime/mgcmark.go:1015 +0x2f1 runtime.shade(0xc82131e000) /tmp/go-darwin-amd64-bootstrap/src/runtime/mgcmark.go:953 +0x9a runtime.gcmarkwb_m(0x87f6e8, 0xc82131e000) /tmp/go-darwin-amd64-bootstrap/src/runtime/mbarrier.go:91 +0xc1 runtime.writebarrierptr_nostore1.func1() /tmp/go-darwin-amd64-bootstrap/src/runtime/mbarrier.go:117 +0x134 runtime.systemstack(0xc8204be940) /tmp/go-darwin-amd64-bootstrap/src/runtime/asm_amd64.s:262 +0x79 runtime.mstart() /tmp/go-darwin-amd64-bootstrap/src/runtime/proc1.go:668 goroutine 1 [running]: runtime.systemstack_switch() /tmp/go-darwin-amd64-bootstrap/src/runtime/asm_amd64.s:216 fp=0xc820a6d508 sp=0xc820a6d500 runtime.writebarrierptr_nostore1(0x87f6e8, 0xc82131e000) /tmp/go-darwin-amd64-bootstrap/src/runtime/mbarrier.go:118 +0x71 fp=0xc820a6d540 sp=0xc820a6d508 runtime.writebarrierptr(0x87f6e8, 0xc82131e000) /tmp/go-darwin-amd64-bootstrap/src/runtime/mbarrier.go:137 +0x4b fp=0xc820a6d570 sp=0xc820a6d540 cmd/compile/internal/gc.Prog(0x9, 0x3c705) /tmp/go-darwin-amd64-bootstrap/src/cmd/compile/internal/gc/gsubr.go:117 +0x1cd fp=0xc820a6d5d8 sp=0xc820a6d570 cmd/compile/internal/gc.Gbranch(0x9, 0x0, 0x0, 0x0) /tmp/go-darwin-amd64-bootstrap/src/cmd/compile/internal/gc/gsubr.go:85 +0x2b fp=0xc820a6d660 sp=0xc820a6d5d8 cmd/compile/internal/gc.gjmp(0x0, 0x3d8) /tmp/go-darwin-amd64-bootstrap/src/cmd/compile/internal/gc/gsubr.go:242 +0x32 fp=0xc820a6d690 sp=0xc820a6d660 cmd/compile/internal/gc.gen(0xc820b43830) /tmp/go-darwin-amd64-bootstrap/src/cmd/compile/internal/gc/gen.go:814 +0x116b fp=0xc820a6d7e8 sp=0xc820a6d690 cmd/compile/internal/gc.Genlist(0xc8212aeca0) /tmp/go-darwin-amd64-bootstrap/src/cmd/compile/internal/gc/gen.go:219 +0x30 fp=0xc820a6d7f8 sp=0xc820a6d7e8 cmd/compile/internal/gc.compile(0xc820b434d0) /tmp/go-darwin-amd64-bootstrap/src/cmd/compile/internal/gc/pgen.go:471 +0xc13 fp=0xc820a6da68 sp=0xc820a6d7f8 cmd/compile/internal/gc.funccompile(0xc820b434d0) /tmp/go-darwin-amd64-bootstrap/src/cmd/compile/internal/gc/dcl.go:1484 +0x1c9 fp=0xc820a6dae0 sp=0xc820a6da68 cmd/compile/internal/gc.Main() /tmp/go-darwin-amd64-bootstrap/src/cmd/compile/internal/gc/lex.go:473 +0x1f08 fp=0xc820a6dde0 sp=0xc820a6dae0 cmd/compile/internal/amd64.Main() /tmp/go-darwin-amd64-bootstrap/src/cmd/compile/internal/amd64/galign.go:127 +0x58d fp=0xc820a6de48 sp=0xc820a6dde0 main.main() /tmp/go-darwin-amd64-bootstrap/src/cmd/compile/main.go:26 +0x189 fp=0xc820a6df20 sp=0xc820a6de48 runtime.main() /tmp/go-darwin-amd64-bootstrap/src/runtime/proc.go:111 +0x2b0 fp=0xc820a6df70 sp=0xc820a6df20 runtime.goexit() /tmp/go-darwin-amd64-bootstrap/src/runtime/asm_amd64.s:1721 +0x1 fp=0xc820a6df78 sp=0xc820a6df70 bootstrap/link/internal/amd64 bootstrap/link/internal/arm bootstrap/link/internal/arm64 bootstrap/link/internal/mips64 bootstrap/link/internal/ppc64 bootstrap/link/internal/s390x bootstrap/link/internal/x86 bootstrap/link