Scala Native binding for libcurl

STILL WORK IN PROGRESS - NOT READY FOR USE

Setup

Ensure curl.h is present in the system.

In macOS, the curl.h header file should already be present in the system.

In Ubuntu, install the following package to obtain curl.h:

$ sudo apt-get install libcurl4-gnutls-dev

Problem binding libcurl's CURLOption

The libcurl's CURLOption is a typedef enum which is generated using C #define macro:

https://github.com/curl/curl/blob/master/include/curl/curl.h#L910

At the moment I seem to be having the problem binding the CURLOption.

Execute the following command to bind libcurl:

$ sbt nativeLink

Running the program above will result in the following error:

[error] Undefined symbols for architecture x86_64:
[error]   "_CURLOPT_URL", referenced from:
[error]       _com.lightbend.scalanative.curl.Main$::main_scala.scalanative.runtime.ObjectArray_unit in com.lightbend.scalanative.curl.ll.o
[error] ld: symbol(s) not found for architecture x86_64

This error seemed strange as given the following CURLOption:

https://github.com/curl/curl/blob/master/include/curl/curl.h#L915

the #define macro should generate an enum called CURLOPT_URL having 10002 as its value.

This can be confirmed by running the following cut-down curl.h snippet:

https://godbolt.org/g/ZDYwbt

which contains the following line:

!5 = !DIEnumerator(name: "CURLOPT_URL", value: 10002)