Fails to build android library

[mgasiorowski]

Hi.

I followed instructions for building libraries for mobile (https://github.com/ProtonMail/gopenpgp#using-with-go-mobile), and ios/macos builds without a problem.

But android fails with error:

# runtime/cgo
ld: error: duplicate symbol: x_cgo_inittls
>>> defined at gcc_android.c:90
>>>            $WORK/b108/_x003.o:(x_cgo_inittls)
>>> defined at gcc_linux_arm.c:13
>>>            $WORK/b108/_x006.o:(.bss+0x4)
clang: error: linker command failed with exit code 1 (use -v to see invocation)

go version go version go1.15.6 darwin/amd64

All environment variables set.

I tried with NDK versions:

• 21.0.6113669
• 22.0.7026061

[marinthiercelin]

Hey, it seems like it's more an issue about golang.org/x/mobile than with gopenpgp.

It could be related to this issue golang/go#42655.

In the meantime, I managed to make it work for NDK version 21.3.6528147 could you try it on your side ?

[marinthiercelin]

We also have prepared builds on github if you need https://github.com/ProtonMail/gopenpgp/actions?query=workflow%3A%22Gomobile+for+Android%22

[mgasiorowski]

With 21.3.6528147 I don't see any errors, but the android directory is still empty.

[marinthiercelin]

In my case I see the build inside the dist/android folder.
Could you share an execution trace of the script ?

[mgasiorowski]

Here you go, log for android build
https://gist.github.com/mgasiorowski/aa16875c0404a441057905243381803a

Directory tree after build:

.
├── Gopenpgp.xcframework
│   ├── Info.plist
│   ├── ios-arm64
│   ├── ios-x86_64-maccatalyst
│   ├── ios-x86_64-simulator
│   └── macos-x86_64
├── android
├── ios
│   └── Gopenpgp.framework
├── ios-simulator
│   └── Gopenpgp.framework
├── macos
│   └── Gopenpgp.framework
└── macos-ui
    └── Gopenpgp.framework

[marinthiercelin]

Thanks for the log.
I can still see the same error you had before (line 706).

# runtime/cgo
ld: error: duplicate symbol: x_cgo_inittls
>>> defined at gcc_android.c:90
>>>            $WORK/b108/_x003.o:(x_cgo_inittls)
>>> defined at gcc_linux_arm.c:13
>>>            $WORK/b108/_x006.o:(.bss+0x4)
clang: error: linker command failed with exit code 1 (use -v to see invocation)

According to golang/go#42655, an additional issue is that in gomobile $ANDROID_HOME/ndk-bundle will have precedence over the $ANDROID_NDK_HOME so even if you set $ANDROID_NDK_HOME is set to a version that works, it will be ignored by gomobile (see here).
Can you try to temporarily rename the $ANDROID_HOME/ndk-bundle folder to something else, and set $ANDROID_NDK_HOME to your installed version of 21.3.6528147 and then try to rebuild ?

[mgasiorowski]

After swapping the ndk-bundle directory to version 21.3.6528147 (cp -r ndk/21.3.6528147 ndk-bundle), the library built correctly. Thanks for your help :)