Hi, I dowloaded Kotlin/Native to my computer using GitHub Desktop, and I'm trying to open the sample...

# kotlin-native

[louiscad]

Hi, I dowloaded Kotlin/Native to my computer using GitHub Desktop, and I'm trying to open the samples directory in CLion EAP (which has the Kotlin/Native plugin), but when I press "open" and select the "samples" directory, nothing happens. When I try "import from sources", it asks me to select files for a CMake project, and I don't know what to do since the samples seem to be built by gradle, and I don't know anything in CMake (I'm a true beginner in the native ecosystem).

Could anyone help me in getting the samples open properly in CLion please?

[snrostov]

AFAIK, you cannot open samples from this repo in CLion. CLion supports only CMake projects and this examples are in gradle.

But CLion Kotlin plugin has some builtin examples: File -> New project… -> Kotlin/Native Application -> Select example from listbox

[louiscad]

That's sad. I'd like to explore Kotlin/Native with the IDE to see what I can do rapidly

[snrostov]

You can do it with Kotlin/Native examples built in CLion

[louiscad]

Yep, I already did, but wanted to take a look at the tensorflow sample

[snrostov]

@louiscad I’m ported this sample to CMake: https://github.com/snrostov/konan_cmake_HelloTensorflow

[snrostov]

You need to run downloadTensorflow.sh first

[louiscad]

Thank you for this! BTW, you made a typo in the GitHub subtitle where you typed "proted" instead of "typed"

[snrostov]

Oops. Fixed

[louiscad]

meant "ported", not "typed" concurrency bug while thinking 😂

[louiscad]

The project (just like the sample gradle project) doesn't build. I guess the cause is what's "explained" in the README:
You may need to specify LD_LIBRARY_PATH or DYLD_LIBRARY_PATH to $HOME/.konan/third-party/tensorflow/lib
if the TensorFlow dynamic library cannot be found.

[louiscad]

The only issue, is that the explanation is not explicit enough for native beginners like me: Where do I specify this?
It'd be nice if anyone can tell me

[snrostov]

You should do it in run configration

[snrostov]

In the Environment variables field

[louiscad]

And how am I supposed to do it in the gradle config if I want to build all the samples?

[snrostov]

You just need to set the same env var before running target kexe

[louiscad]

Also, there are 4 configurations (you have them too, right?), which one am I supposed to pick?

[snrostov]

HelloTensorflow.kexe

[louiscad]

For gradle, I need to add them in one of the properties file?

[snrostov]

No, just build it using gradle and then run in terminal:

export DYLD_LIBRARY_PATH=~/.konan/third-party/tensorflow/lib
./build/bin/HelloTensorflow.kexe

[louiscad]

BTW, I have unresolved references for all tensorflow related symbols. Do you have them resolved in CLion?

[snrostov]

What the name of unresolved symbold?

[snrostov]

try to check it using nm -g ~/.konan/third-party/tensorflow/lib/libtensorflow.so | grep $SYMBOLD_NAME

[louiscad]

the whole tensorflow package and it's contents, starting from the import

[louiscad]

Will post a screenshot back in the channel

[louiscad]

It's in #kotlin-native (

https://kotlinlang.slack.com/files/U3ZLHBTLG/F87KWV094/screen_shot_2017-11-28_at_23.01.34.png▾

)

[louiscad]

message has been deleted

[snrostov]

There are 2 unrelated problems here:
1) unresolved references in editor. looks like closing it and opening again should help
2) linker cannot find symbol in tensorflow.so

for second one try to run this:
nm -g ~/.konan/third-party/tensorflow/lib/libtensorflow.so | grep TF_GraphImportGraphDefOptions

[snrostov]

is there TF_GraphImportGraphDefOptionsRemapControlDependency in output?

[louiscad]

There's no output at all

[snrostov]

then just comment out

extern void TF_GraphImportGraphDefOptionsRemapControlDependency(
    TF_ImportGraphDefOptions* opts, const char* src_name, TF_Operation* dst);

in ~/.konan/third-party/tensorflow/include/tensorflow/c/c_api.h

[louiscad]

Why would it not be correct?

[snrostov]

Looks like bug in tensorflow build

[snrostov]

this symbol is declared in header and not provided in so

[louiscad]

Still doesn't build

[snrostov]

Try run -> clean first

[louiscad]

KtFile: HelloTensorflow.kt
ld: warning: could not create compact unwind for _ffi_call_unix64: does not use RBP or RSP based frame
Undefined symbols for architecture x86_64:
  "_TF_GraphImportGraphDefOptionsRemapControlDependency", referenced from:
      _tensorflow_kniBridge96 in combined6191069496991552343.o
ld: symbol(s) not found for architecture x86_64
error: linker invocation reported errors
make[3]: *** [CMakeFiles/HelloTensorflow_TEMP.kexe] Error 1
make[2]: *** [CMakeFiles/HelloTensorflow.compile.dir/all] Error 2
make[1]: *** [CMakeFiles/HelloTensorflow.kexe.dir/rule] Error 2
make: *** [HelloTensorflow.kexe] Error 2

[louiscad]

You were right about closing and reopening the IDE for unresolved references. Weird… Is this a known bug?

[snrostov]

I don’t know

[snrostov]

For the second: did you try build with clean first after changing header? Does it helps?

[louiscad]

Just came back to the IDE after hitting clean (was instant) and pressing run button again to build the project, and the references are unresolved again

[louiscad]

It's still building at the moment

[louiscad]

It finished, but with a non 0 exit code, not sure how to interpret that

[louiscad]

GitHub/konan_cmake_HelloTensorflow/cmake-build-debug/HelloTensorflow.kexe
dyld: Library not loaded: bazel-out/local-opt/bin/tensorflow/libtensorflow.so
  Referenced from: /Users/statop/GitHub/konan_cmake_HelloTensorflow/cmake-build-debug/HelloTensorflow.kexe
  Reason: image not found

Process finished with exit code 6

[louiscad]

BTW, the unresolved references are gone again

[snrostov]

Looks like the env variable not set properly

[louiscad]

It's like you saw it in my screenshot

[louiscad]

Should I use $HOME instead of ~?

[snrostov]

Try to use absolute paths

[snrostov]

This is worked for me: https://yadi.sk/i/kM1yEUwP3Q8ykE

[louiscad]

Works with absolute path!

[louiscad]

Thanks a lot for helping me overcome these roadblocks!

[snrostov]

No problem )

[louiscad]

So 3+2 = 5 😂

[louiscad]

Given I'm a beginner in the native world (but not in Kotlin, used for 1y+ on Android apps, nor Java used it for ~4y, minus the Kotlin year and the upcoming ones), where can I learn more about CMake, C (for interop with Kotlin/Native and general knowledge) and machine learning? Also want to learn about LLVM.

I'm a bit confused by all of this now, don't know where to start, and all resources I looked at by now kept me at the bottom of the learning curve.

[snrostov]

Sorry, I’m not an expert in C/CMake nor in ML. For ML looks like #datascience is good place for this question.