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runtime/cgo: objdump error "unsupported architecture" for amd64 #39682

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neclepsio opened this issue Jun 18, 2020 · 5 comments
Closed

runtime/cgo: objdump error "unsupported architecture" for amd64 #39682

neclepsio opened this issue Jun 18, 2020 · 5 comments
Labels
FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. OS-Windows
Milestone
Unplanned

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

$ go version
go version go1.14.2 windows/amd64

Does this issue reproduce with the latest release?

Yes, it happens with 1.14.4 too.

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

go env Output
$ go env
set GO111MODULE=on
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\[...]\AppData\Local\go-build
set GOENV=C:\[...]\AppData\Roaming\go\env
set GOEXE=.exe
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=c:\[...]\Go-Modules
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=c:\[...]\go1.14.2
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=c:\[...]\go1.14.2\pkg\tool\windows_amd64
set GCCGO=gccgo
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=C:\[...]\go.mod
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=C:\[...]\Temp\go-build345817374=/tmp/go-build -gno-record-gcc-switches
gcc -v Output
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=c:/[...]/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.1.0/lto-wrapper.exe
Target: x86_64-w64-mingw32
Configured with: ../gcc-10.1.0/configure --prefix=/mingw64 --with-local-prefix=/mingw64/local --build=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --with-native-system-header-dir=/mingw64/x86_64-w64-mingw32/include --libexecdir=/mingw64/lib --enable-bootstrap --with-arch=x86-64 --with-tune=generic --enable-languages=c,lto,c++,fortran,ada,objc,obj-c++ --enable-shared --enable-static --enable-libatomic --enable-threads=posix --enable-graphite --enable-fully-dynamic-string --enable-libstdcxx-filesystem-ts=yes --enable-libstdcxx-time=yes --disable-libstdcxx-pch --disable-libstdcxx-debug --disable-isl-version-check --enable-lto --enable-libgomp --disable-multilib --enable-checking=release --disable-rpath --disable-win32-registry --disable-nls --disable-werror --disable-symvers --disable-plugin --with-libiconv --with-system-zlib --with-gmp=/mingw64 --with-mpfr=/mingw64 --with-mpc=/mingw64 --with-isl=/mingw64 --with-pkgversion='Rev3, Built by MSYS2 project' --with-bugurl=https://sourceforge.net/projects/msys2 --with-gnu-as --with-gnu-ld
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.1.0 (Rev3, Built by MSYS2 project)

What did you do?

Minimal test.go:

package main

// void f() {}
import "C"

func main() {}

Commands:

C:\[...]\test>go build

C:\[...]\test>file test.exe
test.exe: PE32+ executable (console) x86-64, for MS Windows

C:\[...]\test>go tool objdump test.exe
objdump: disassemble test.exe: unsupported architecture

What did you expect to see?

The result of disassembly.

What did you see instead?

Error message objdump: disassemble test.exe: unsupported architecture.

This only happens for binaries using cgo. I didn't find anywhere this is unsupported, so I'm opening this issue. I'm using mingw64; gcc -v output is included above, in operating system details section. Binaries run correctly.
@andybons andybons changed the title objdump error "unsupported architecture" for amd64 using cgo cgo: objdump error "unsupported architecture" for amd64 Jun 18, 2020
@andybons
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@ianlancetaylor

@andybons andybons added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Jun 18, 2020
@andybons andybons changed the title cgo: objdump error "unsupported architecture" for amd64 runtime/cgo: objdump error "unsupported architecture" for amd64 Jun 18, 2020
@andybons andybons added this to the Unplanned milestone Jun 18, 2020
@gopherbot
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Change https://golang.org/cl/240957 mentions this issue: cmd/internal/objfile: use pe.FileHeader.Machine to determine GOARCH

@alexbrainman
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@neclepsio

Thank you for reporting this problem. It appears it was always broken this way.

Can you, please, try this fix

https://go-review.googlesource.com/c/go/+/240957

?

Thank you.

Alex

@neclepsio
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It works, thank you!

@alexbrainman
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It works, thank you!

Thanks for checking. I will submit my change after go 1.15 is released. So this change will be part of go 1.16.

Alex

@golang golang locked and limited conversation to collaborators Aug 22, 2021
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