[foreign] Instructions for using libraries on Windows

[Maurizio Cimadamore]

Cool! Thanks for investigating...

Maurizio

On 17/01/2019 21:17, Jorn Vernee wrote:
> This also has been fixed in the TensorFlow recently: 
> https://github.com/tensorflow/tensorflow/commit/ceee617b3675037da8637997f673ab9a993ee5de
>
> So this should not be a problem anymore once this change makes it into 
> the binary distributions.
>
> Jorn
>
> Jorn Vernee schreef op 2019-01-17 22:13:
>> FWIW, I've investigated the stack overflow with Tensorflow, and it
>> seems to be caused by a template type in the standard C++ library on
>> Windows (since we're running in C++ mode).
>>
>> As a workaround we can manually fix the function prototypes in
>> `c_api.h` needed for the example:
>>
>>     TF_Version() -> TF_Version(void)
>>     TF_NewGraph() -> TF_NewGraph(void)
>>     TF_NewSessionOptions() -> TF_NewSessionOptions(void)
>>     TF_NewStatus() -> TF_NewStatus(void)
>>
>> After that jextract succeeds without using the extra Clang flags, and
>> the example seems to work as well.
>>
>> Jorn
>>
>> Jorn Vernee schreef op 2019-01-17 17:36:
>>> Hi,
>>>
>>> I have updated panama_foreign.md with instructions for jextracting and
>>> running OpenGL and Python. I have also tried other Windows applicable
>>> libraries, here were the issues:
>>>
>>> LAPACK & BLAS: require libgfortran-3 as a dependency, which I couldn't
>>> find a binary distro for so quickly. (MINGW has a package for it, but
>>> only libgfortran-4)
>>>
>>> Tensorflow: is crashing jextract with a stack overflow error.
>>>
>>> ```
>>>     Exception in thread "main" java.lang.StackOverflowError
>>>         at
>>> jdk.internal.clang/jdk.internal.clang.StructType.<init>(StructType.java:37) 
>>>
>>>         at
>>> jdk.internal.clang/jdk.internal.clang.StructType.<init>(StructType.java:32) 
>>>
>>>         at 
>>> jdk.internal.clang/jdk.internal.clang.Type.<init>(Type.java:30)
>>>         at
>>> jdk.internal.clang/jdk.internal.clang.Type.canonicalType(Native
>>> Method)
>>>         at
>>> jdk.jextract/com.sun.tools.jextract.TypeDictionary.getInternal(TypeDictionary.java:134) 
>>>
>>>         at
>>> jdk.jextract/com.sun.tools.jextract.TypeDictionary.getInternal(TypeDictionary.java:134) 
>>>
>>>         at
>>> jdk.jextract/com.sun.tools.jextract.TypeDictionary.getInternal(TypeDictionary.java:134) 
>>>
>>>         at
>>> jdk.jextract/com.sun.tools.jextract.TypeDictionary.getInternal(TypeDictionary.java:134) 
>>>
>>>         ...
>>> ```
>>>
>>> FWIW, you made a note about needing to pass `-C -c -C c++` to jextract
>>> so it doesn't interpret some methods as varargs. I've tried without
>>> those flags and am observing the same vararg problem, but in that case
>>> extraction does succeed.
>>>
>>> The other libraries libproc, readline, and unistd don't seem
>>> applicable to Windows. I will be on the lookout for Windows specific
>>> examples that could be interesting.
>>>
>>> The `make update-build-doc` does not work on windows [1], so I ask
>>> that you generate the .html dos for me instead.
>>>
>>> Here is the updated panama_foreign.md:
>>> http://cr.openjdk.java.net/~jvernee/panama/panama_foreign.md
>>>
>>> Jorn
>>>
>>> [1] : 
>>> https://mail.openjdk.java.net/pipermail/build-dev/2019-January/024666.html