Error on compiling go source with CGO_ENABLED=1

[angeloc]

What version of Go are you using (go version)?

Go 1.8.3 (but 1.9 exhibits same behavior).

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

I'm compili go source code inside buildroot on host machine X86_64 versus a target architecture ARM.

What did you do?

I compile go with this command:

cd /media/angelo/WD/data/BUILDROOT/br_qemu_arm/build/host-go-1.8.3/src && GOROOT_BOOTSTRAP=/media/angelo/WD/data/BUILDROOT/br_qemu_arm/host/lib/go-1.4.3 GOROOT_FINAL=/media/angelo/WD/data/BUILDROOT/br_qemu_arm/host/lib/go GOROOT="/media/angelo/WD/data/BUILDROOT/br_qemu_arm/build/host-go-1.8.3" GOBIN="/media/angelo/WD/data/BUILDROOT/br_qemu_arm/build/host-go-1.8.3/bin" GOARCH=arm GOARM=5 GOOS=linux CGO_ENABLED=1 CC=/usr/bin/gcc CC_FOR_TARGET=/usr/bin/gcc CXX_FOR_TARGET=/usr/bin/gcc ./make.bash

What did you expect to see?

The go executable and companion software compiled correctly.

What did you see instead?

[...]
##### Building packages and commands for linux/arm.
runtime/internal/sys
runtime/internal/atomic
runtime
errors
internal/race
sync/atomic
unicode
unicode/utf8
math
container/list
container/ring
crypto/subtle
crypto/internal/cipherhw
internal/nettrace
runtime/cgo
vendor/golang_org/x/crypto/curve25519
encoding
sync
unicode/utf16
# runtime/cgo
gcc: error: unrecognized command line option '-marm'
image/color
vendor/golang_org/x/crypto/poly1305
internal/syscall/windows
internal/syscall/windows/registry
internal/syscall/windows/sysdll
runtime/race
cmd/compile/internal/test
cmd/vet/internal/whitelist
syscall
io
internal/singleflight
image/color/palette
hash
crypto/cipher
runtime/trace
bytes
strings
hash/adler32
hash/crc32
crypto/hmac
hash/crc64
hash/fnv
strconv
math/rand
math/cmplx
bufio
text/tabwriter
vendor/golang_org/x/text/transform
path
html
reflect
crypto
crypto/aes
crypto/rc4
encoding/base64
encoding/ascii85
encoding/base32
crypto/sha512
crypto/md5
crypto/sha1
crypto/sha256
image
internal/syscall/unix
time
image/internal/imageutil
image/draw
image/jpeg
os
os/signal
fmt
encoding/binary
sort
regexp/syntax
path/filepath
compress/bzip2
container/heap
encoding/pem
runtime/debug
cmd/internal/sys
crypto/des
vendor/golang_org/x/crypto/chacha20poly1305/internal/chacha20
vendor/golang_org/x/crypto/chacha20poly1305
io/ioutil
cmd/internal/dwarf
flag
log
debug/dwarf
compress/flate
debug/gosym
debug/plan9obj
cmd/vendor/golang.org/x/arch/arm/armasm
cmd/vendor/golang.org/x/arch/ppc64/ppc64asm
cmd/vendor/golang.org/x/arch/x86/x86asm
regexp
cmd/internal/obj
archive/tar
compress/zlib
archive/zip
compress/gzip
compress/lzw
context
math/big
debug/elf
debug/macho
debug/pe
encoding/hex
database/sql/driver
encoding/csv
encoding/gob
cmd/internal/goobj
encoding/json
encoding/xml
database/sql
vendor/golang_org/x/net/http2/hpack
vendor/golang_org/x/net/idna
vendor/golang_org/x/text/unicode/norm
cmd/internal/objfile
vendor/golang_org/x/text/width
crypto/dsa
crypto/elliptic
encoding/asn1
cmd/addr2line
crypto/rand
mime
mime/quotedprintable
crypto/rsa
crypto/ecdsa
crypto/x509/pkix
net/http/internal
net/url
go/token
text/template/parse
os/exec
text/scanner
image/gif
go/scanner
go/constant
image/png
index/suffixarray
internal/pprof/profile
testing
internal/trace
go/ast
net/internal/socktest
testing/iotest
testing/quick
text/template
cmd/internal/obj/arm
cmd/internal/obj/arm64
cmd/internal/obj/mips
cmd/internal/obj/ppc64
internal/testenv
cmd/internal/obj/s390x
go/parser
go/printer
runtime/pprof/internal/protopprof
cmd/internal/obj/x86
runtime/pprof
go/doc
html/template
testing/internal/testdeps
cmd/asm/internal/flags
go/types
cmd/asm/internal/lex
go/format
cmd/internal/bio
go/build
cmd/cgo
cmd/compile/internal/syntax
cmd/internal/gcprog
cmd/internal/browser
cmd/dist
cmd/fix
cmd/gofmt
cmd/asm/internal/arch
cmd/compile/internal/ssa
cmd/asm/internal/asm
cmd/cover
cmd/doc
cmd/link/internal/ld
cmd/asm
cmd/nm
cmd/objdump
cmd/pack
cmd/pprof/internal/plugin
go/internal/gccgoimporter
go/internal/gcimporter
cmd/api
cmd/pprof/internal/report
cmd/pprof/internal/svg
cmd/pprof/internal/tempfile
cmd/pprof/internal/symbolizer
go/importer
cmd/pprof/internal/symbolz
cmd/vet/internal/cfg
cmd/vet
cmd/pprof/internal/commands
cmd/pprof/internal/driver
cmd/link/internal/arm
cmd/link/internal/arm64
cmd/link/internal/amd64
cmd/link/internal/mips
cmd/link/internal/mips64
cmd/link/internal/ppc64
cmd/link/internal/s390x
cmd/link/internal/x86
cmd/link
cmd/compile/internal/gc
cmd/compile/internal/amd64
cmd/compile/internal/arm
cmd/compile/internal/arm64
cmd/compile/internal/mips
cmd/compile/internal/mips64
cmd/compile/internal/ppc64
cmd/compile/internal/s390x
cmd/compile/internal/x86
cmd/compile
package/pkg-generic.mk:234: recipe for target '/media/angelo/WD/data/BUILDROOT/br_qemu_arm/build/host-go-1.8.3/.stamp_built' failed
make[1]: *** [/media/angelo/WD/data/BUILDROOT/br_qemu_arm/build/host-go-1.8.3/.stamp_built] Error 2

There's an error somewhere, but I cannot find it simply looking at the build output. Can you provide some advice to debug this problem and eventually helping to fix it and submit (if submittable)?

Thanks!

[davecheney]

You cannot build a cross compiling toolchain like that. To a first approximation change GOOS and/or GOARCH and forcing CGO_ENABLED=1 are mutually exclusive. What is the problem you are trying to solve?

…

On 3 Oct 2017, at 21:39, Angelo Compagnucci ***@***.***> wrote: What version of Go are you using (go version)? Go 1.8.3 (but 1.9 exhibits same behavior). Does this issue reproduce with the latest release? Yes What operating system and processor architecture are you using (go env)? I'm compili go source code inside buildroot on host machine X86_64 versus a target architecture ARM. What did you do? I compile go with this command: cd /media/angelo/WD/data/BUILDROOT/br_qemu_arm/build/host-go-1.8.3/src && GOROOT_BOOTSTRAP=/media/angelo/WD/data/BUILDROOT/br_qemu_arm/host/lib/go-1.4.3 GOROOT_FINAL=/media/angelo/WD/data/BUILDROOT/br_qemu_arm/host/lib/go GOROOT="/media/angelo/WD/data/BUILDROOT/br_qemu_arm/build/host-go-1.8.3" GOBIN="/media/angelo/WD/data/BUILDROOT/br_qemu_arm/build/host-go-1.8.3/bin" GOARCH=arm GOARM=5 GOOS=linux CGO_ENABLED=1 CC=/usr/bin/gcc CC_FOR_TARGET=/usr/bin/gcc CXX_FOR_TARGET=/usr/bin/gcc ./make.bash What did you expect to see? The go executable and companion software compiled correctly. What did you see instead? ##### Building packages and commands for linux/arm. runtime/internal/sys runtime/internal/atomic runtime errors internal/race sync/atomic unicode unicode/utf8 math container/list container/ring crypto/subtle crypto/internal/cipherhw internal/nettrace runtime/cgo vendor/golang_org/x/crypto/curve25519 encoding sync unicode/utf16 # runtime/cgo gcc: error: unrecognized command line option '-marm' image/color vendor/golang_org/x/crypto/poly1305 internal/syscall/windows internal/syscall/windows/registry internal/syscall/windows/sysdll runtime/race cmd/compile/internal/test cmd/vet/internal/whitelist syscall io internal/singleflight image/color/palette hash crypto/cipher runtime/trace bytes strings hash/adler32 hash/crc32 crypto/hmac hash/crc64 hash/fnv strconv math/rand math/cmplx bufio text/tabwriter vendor/golang_org/x/text/transform path html reflect crypto crypto/aes crypto/rc4 encoding/base64 encoding/ascii85 encoding/base32 crypto/sha512 crypto/md5 crypto/sha1 crypto/sha256 image internal/syscall/unix time image/internal/imageutil image/draw image/jpeg os os/signal fmt encoding/binary sort regexp/syntax path/filepath compress/bzip2 container/heap encoding/pem runtime/debug cmd/internal/sys crypto/des vendor/golang_org/x/crypto/chacha20poly1305/internal/chacha20 vendor/golang_org/x/crypto/chacha20poly1305 io/ioutil cmd/internal/dwarf flag log debug/dwarf compress/flate debug/gosym debug/plan9obj cmd/vendor/golang.org/x/arch/arm/armasm cmd/vendor/golang.org/x/arch/ppc64/ppc64asm cmd/vendor/golang.org/x/arch/x86/x86asm regexp cmd/internal/obj archive/tar compress/zlib archive/zip compress/gzip compress/lzw context math/big debug/elf debug/macho debug/pe encoding/hex database/sql/driver encoding/csv encoding/gob cmd/internal/goobj encoding/json encoding/xml database/sql vendor/golang_org/x/net/http2/hpack vendor/golang_org/x/net/idna vendor/golang_org/x/text/unicode/norm cmd/internal/objfile vendor/golang_org/x/text/width crypto/dsa crypto/elliptic encoding/asn1 cmd/addr2line crypto/rand mime mime/quotedprintable crypto/rsa crypto/ecdsa crypto/x509/pkix net/http/internal net/url go/token text/template/parse os/exec text/scanner image/gif go/scanner go/constant image/png index/suffixarray internal/pprof/profile testing internal/trace go/ast net/internal/socktest testing/iotest testing/quick text/template cmd/internal/obj/arm cmd/internal/obj/arm64 cmd/internal/obj/mips cmd/internal/obj/ppc64 internal/testenv cmd/internal/obj/s390x go/parser go/printer runtime/pprof/internal/protopprof cmd/internal/obj/x86 runtime/pprof go/doc html/template testing/internal/testdeps cmd/asm/internal/flags go/types cmd/asm/internal/lex go/format cmd/internal/bio go/build cmd/cgo cmd/compile/internal/syntax cmd/internal/gcprog cmd/internal/browser cmd/dist cmd/fix cmd/gofmt cmd/asm/internal/arch cmd/compile/internal/ssa cmd/asm/internal/asm cmd/cover cmd/doc cmd/link/internal/ld cmd/asm cmd/nm cmd/objdump cmd/pack cmd/pprof/internal/plugin go/internal/gccgoimporter go/internal/gcimporter cmd/api cmd/pprof/internal/report cmd/pprof/internal/svg cmd/pprof/internal/tempfile cmd/pprof/internal/symbolizer go/importer cmd/pprof/internal/symbolz cmd/vet/internal/cfg cmd/vet cmd/pprof/internal/commands cmd/pprof/internal/driver cmd/link/internal/arm cmd/link/internal/arm64 cmd/link/internal/amd64 cmd/link/internal/mips cmd/link/internal/mips64 cmd/link/internal/ppc64 cmd/link/internal/s390x cmd/link/internal/x86 cmd/link cmd/compile/internal/gc cmd/compile/internal/amd64 cmd/compile/internal/arm cmd/compile/internal/arm64 cmd/compile/internal/mips cmd/compile/internal/mips64 cmd/compile/internal/ppc64 cmd/compile/internal/s390x cmd/compile/internal/x86 cmd/compile package/pkg-generic.mk:234: recipe for target '/media/angelo/WD/data/BUILDROOT/br_qemu_arm/build/host-go-1.8.3/.stamp_built' failed make[1]: *** [/media/angelo/WD/data/BUILDROOT/br_qemu_arm/build/host-go-1.8.3/.stamp_built] Error 2 There's an error somewhere, but I cannot find it simply looking at the build output. Can you provide some advice to debug this problem and eventually helping to fix it and submit (if submittable)? Thanks! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub, or mute the thread.

[angeloc]

Thanks for the reply @davecheney .

In buildroot we have the need to build packages for a target architecture that can be different from the host one. So we are trying to compile a go compiler that will produce go binaries for the target architecture.
I actually had a suspect something was not working like expected when I had the error "no buildable Go source files in ..." and I noticed that the go files were all files whit embedded C and in need of cgo.

So I thought that something was wrong with the compilation of the go binary and tools and noticed that CGO_ENABLED was set to 0.

So in the end, to crosscompile a package with embedded C should I use CGO for the target architecture or am I wrong?

[ianlancetaylor]

In order to build a Go cross-compiler with cgo enabled, you need to provide C cross-compilers to your target. You set CC_FOR_TARGET to /usr/bin/gcc, but that is very unlikely to be a cross-compiler. You need a compiler that runs on your x86_64 host and generates code for ARM.

Closing this issue because I don't see anything to fix in Go. For further questions please use a forum; see https://golang.org/wiki/Questions. Thanks.