embedding julia failed due to missing header file.

[randy3k]

Following the comment here

libuv.a is not in the binaries any more, so this can probably be closed. But since #8024 we also aren't installing uv.h, which breaks the embedding use case since julia.h include's it. There are some uv_ types in julia.h, so do we need to put the libuv header back?

One fails to include julia.h as uv.h is missing from the binary distribution or the "make install" distribution.

gcc -g -Wall -I/usr/local/Cellar/r/3.1.1/R.framework/Resources/include -I/opt/local/julia-0.3.1/bin/../include/julia -fPIC -c external.c -o external.o
In file included from external.c:7:
/opt/local/julia-0.3.1/bin/../include/julia/julia.h:11:10: fatal error: 'uv.h'
      file not found
#include "uv.h"
         ^
1 error generated.
make: *** [external.o] Error 1

[stevengj]

We could distribute uv.h, but maybe we should change julia.h so that it does not depend on this (by moving all libuv dependencies into julia_internal.h)?

[JeffBezanson]

It does look like everything in julia.h that uses uv should be moved to julia_internal.h. We might want to keep the dlopen functions in julia.h, but they can be declared to return void* handles.

[nalimilan]

Maybe worth fixing before 0.3.2? It's been reported once more on the list.

[randy3k]

It has not fixed the problem, there is another file including "uv.h"

gcc -g -O2 -std=gnu99 -Wall -I/opt/local/julia-dev/include/julia -I/Library/Frameworks/R.framework/Resources/include -fPIC -c rj_cast.c -o rj_cast.o
In file included from rj_cast.c:5:
In file included from /opt/local/julia-dev/include/julia/julia.h:10:
In file included from /opt/local/julia-dev/include/julia/libsupport.h:11:
/opt/local/julia-dev/include/julia/ios.h:5:10: fatal error: 'uv.h' file not
      found
#include "uv.h"
         ^
1 error generated.
make: *** [rj_cast.o] Error 1

[tkelman]

Looks like the only thing that include's needed for is UV_HANDLE_TYPE_MAX ?

[stevengj]

No, it's worse than that: there are all the uses of uv_loop_t and uv_stream_t and uv_async_t in julia.h. I don't know how I missed those...

[stevengj]

Maybe we should revert #8754 and just ship uv.h?

[StefanKarpinski]

Shipping uv.h seems pretty sane.

[JeffBezanson]

Shipping uv.h is not the end of the world, but I think it's nice to properly separate julia.h and julia_internal.h based on what API clients actually need.

[waTeim]

I could help with this, I have some experience with embedding and uv after all...

Ok, I have a possible (workaround?) solution. I don't think it's a complete solution; here are the current limitations.

jl_spawn is currently unavailable to embedding.
all of the various uv_ types are opaque, they need a factory.

[ghost]

I would be interested in a solution enabling parallel computing and also using C/C++ code. Getting the uv.h code would be a possibility ?
Thank you.

[ViralBShah]

Can we close this?