Golang cmd/go: Visual Studio compiler failed to link a C-archive made with Go and MinGW

Go version

go version go1.24.4 windows/amd64

Output of `go env` in your module/workspace:

set AR=ar
set CC=gcc
set CGO_CFLAGS=-O2 -g
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-O2 -g
set CGO_ENABLED=1
set CGO_FFLAGS=-O2 -g
set CGO_LDFLAGS=-O2 -g
set CXX=g++
set GCCGO=gccgo
set GO111MODULE=
set GOAMD64=v1
set GOARCH=amd64
set GOAUTH=netrc
set GOBIN=
set GOCACHE=C:\Users\hajimehoshi\AppData\Local\go-build
set GOCACHEPROG=
set GODEBUG=
set GOENV=C:\Users\hajimehoshi\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFIPS140=off
set GOFLAGS=
set GOGCCFLAGS=-m64 -mthreads -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=C:\Users\HAJIME~1\AppData\Local\Temp\go-build655081393=/tmp/go-build -gno-record-gcc-switches
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMOD=C:\Users\hajimehoshi\test\test\go.mod
set GOMODCACHE=C:\Users\hajimehoshi\go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\hajimehoshi\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=C:\Program Files\Go
set GOSUMDB=sum.golang.org
set GOTELEMETRY=local
set GOTELEMETRYDIR=C:\Users\hajimehoshi\AppData\Roaming\go\telemetry
set GOTMPDIR=
set GOTOOLCHAIN=auto
set GOTOOLDIR=C:\Program Files\Go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.24.4
set GOWORK=
set PKG_CONFIG=pkg-config

What did you do?

Compile this main.go with go build -buildmode=c-archive main.go and create main.a

package main

import "C"

//export PrintSum
func PrintSum(a C.int, b C.int) {
        println(a + b)
}

func main() {
}

Prepare this main.c

int PrintSum(int a, int b);

int main() {
  PrintSum(1, 2);
}

Open a terminal for Visual Studio tools (e.g. x64 Native Tools Command Prompt for VS 2022)
Run this

cl main.c main.a msvcrt.lib

What did you see happen?

Microsoft(R) C/C++ Optimizing Compiler Version 19.38.33139 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

cl : コマンド ライン warning D9024 : ソースファイルの種類 'main.a' は認識できませんでした。オブジェクト ファイルと仮定します。
main.c
Microsoft (R) Incremental Linker Version 14.38.33139.0
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:main.exe
main.obj
main.a
msvcrt.lib
LINK : warning LNK4098: defaultlib 'LIBCMT' は他のライブラリの使用と競合しています。/NODEFAULTLIB:library を使用してください。
main.a(000005.o) : error LNK2019: 未解決の外部シンボル __mingw_vfprintf が関数 fprintf で参照されました
main.a(000007.o) : error LNK2001: 外部シンボル __mingw_vfprintf は未解決です
main.exe : fatal error LNK1120: 1 件の未解決の外部参照

I'm afraid the message was translated into Japanese, but this says that the symbol __mingw_vprintf could not be resolved.

What did you expect to see?

The compilation succeeds.

Comment From: gabyhelp

Related Issues

Related Discussions

Linking cgo with Visual Studio x64 release libraries on Windows

_{(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)}

Comment From: cherrymui

Unfortunately we don't support linking with MSVC. You may follow #20982 for MSVC support. Thanks.

Comment From: hajimehoshi

This is an issue about linking an output C archive with MSVC, and not using MSVC as CC to compile a C archive. Is this issue included in #20982?