go1.11 build shared and for to windows dll still not supported from year 2015 on win x64

[ManPython]

This is still missed function in x64 amd windows system from 2015 y. Why?
#11058
#23052

http:https://blog.ralch.com/tutorial/golang-sharing-libraries/

[ianlancetaylor]

The two issues you mention are closed. What actual problem are you asking about?

[ManPython]

About this: "-buildmode=c-shared not supported on windows/amd64"
Both issues touching this.

[ianlancetaylor]

I'm sorry, I don't understand. Those issues are closed. As of the 1.10 release, -buildmode=c-shared does work on windows/amd64.

[ManPython]

Imposible. I checked now on v1.10 and unistaled this to updated to v1.11 and "-buildmode=c-shared not supported on windows/amd64" on both.
My OS W7x64 U Sp1

[AlexRouSg]

What is the exact command you are trying to run and what is the exact output?
I just tested on windows 10 x64 with 1.11 and it works

[ManPython]

I lost here. I rebot OS, and again unistaled go and instal v1.11
https://www.darkcoding.net/software/building-shared-libraries-in-go-part-1/

When runing in bat
E:\GO\go build -o libdoubler.so -buildmode=c-archive main.go
runtime/cgo
cc1.exe: sorry, unimplemented: 64-bit mode not compiled in

E:\GO\go build -ldflags="-s -w" -buildmode=shared main.go
runtime/cgo
cc1.exe: sorry, unimplemented: 64-bit mode not compiled in

E:\GO\go build -ldflags="-s -w" -buildmode=shared main.go
-buildmode=shared not supported on windows/amd64

E:\GO\go build -ldflags="-s -w" -buildmode=c-archive main.go
runtime/cgo
cc1.exe: sorry, unimplemented: 64-bit mode not compiled in

go install -buildmode=shared -linkshared std
-buildmode=shared not supported on windows/amd64

go install -buildmode=shared -linkshared main.go
-buildmode=shared not supported on windows/amd64

I have instaled:
TDM-GCC-32
TDM-GCC-64
mingw-w64

[AlexRouSg]

This is not a problem with Go, this is your environment not being configured correctly.

Please uninstall all mingw versions, restart, and reinstall only TDM-GCC-64 and make sure Add to PATH is selected

[katiehockman]

@ManPython did this resolve your issue?

[ManPython]

Not solved.
Now I have just TDM-GCC-64 and no changes around problem.

But checked cc1.exe by https://docs.microsoft.com/en-us/sysinternals/downloads/sigcheck

tdm-gcc-64\libexec\gcc\x86_64-w64-mingw32\5.1.0\cc1.exe:
Verified: Unsigned
Link date: 10:58 2027-08-18
Publisher: n/a
Company: n/a
Description: n/a
Product: n/a
Prod version: n/a
File version: n/a
MachineType: 32-bit

Soo? There is long time conflict? Coz TDM is not updated from 2015 on website.
http:https://tdm-gcc.tdragon.net/

[AlexRouSg]

• From the desktop, right click the Computer icon.
• Choose Properties from the context menu.
• Click the Advanced system settings link.
• Click Environment Variables

If C:\TDM-GCC-64\bin or where you installed TDM is not in that string, add it by putting C:\WHERE IS TDM-GCC-64\bin; at the front. The ; is important

If that still doesn't work, open the command line and copy paste the output of gcc --version

[ManPython]

Still not working.

C:>gcc --version
gcc (MinGW.org GCC-6.3.0-1) 6.3.0
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

tdm-gcc-64\bin\gcc.exe:
Verified: Unsigned
Link date: 02:00 1970-01-01
Publisher: n/a
Company: n/a
Description: n/a
Product: n/a
Prod version: n/a
File version: n/a
MachineType: 32-bit

[AlexRouSg]

You still have multiple mingw installations. If you only had TDM it would've said gcc.exe (tdm64-1) 5.1.0

[ManPython]

You was right. I do research with regedit i found minigw with other software.
Now working c-shared, but.. just these function as bellow not

go build -o libdoubler.so -buildmode=shared main.go
-buildmode=shared not supported on windows/amd64

go build -o libdoubler.dll -buildmode=shared main.go
-buildmode=shared not supported on windows/amd64

@AlexRouSg, @ianlancetaylor thank You for help.

[AlexRouSg]

Well as it says, buildmode=shared isn't implemented yet for windows

[ManPython]

So we can't produce .dll in win x64? Just .so?
Is this working on win 386 and go1.11.windows-386 this same (just .so?) ?

I changed topic to clarify situation.

[AlexRouSg]

buildmode=c-shared creates a dll to be used in C programs. It is creating a .so cause you told it to name it .so, change the name to be .dll
buildmode=shared is to create a dll to be used in Go programs, it is not implemented for windows at all.

[AlexRouSg]

Please direct further questions to one of the places listed in https://github.com/golang/go/wiki/Questions
The bug tracker is only used for bugs, and this is clearly not a bug or actionable report.

[ManPython]

Ok. Just last one.
I created .dll but can't call this by ctypes in python this same as .so

In dependency walker I don't see the function DoubleIt as normaly in other .dll's
The .so is available to see functions

BTW strange that is soo many _cgo functions

[ianlancetaylor]

I'm closing this issue. Please use a forum, where there will be more people who can help you. See https://golang.org/wiki/Questions . Thanks.