Re: [Vala] How to mix vala code and C code in one automake-based project correctly?

[Alexander Kojevnikov <alexk gnome org>]

On 27 October 2011 12:53, PCMan <pcman tw gmail com> wrote:
> Hello,
> I'm the developer of LXDE project and I started using Vala last night.
> Most parts of our existing code are written in pure C with or without
> GObject.
> Now I want to do further development in vala.
> To mix vala code with existing C code, I cannot find any good guide on the
> internet.
> Some existing guides are for writing vapi files to call C code in vala.
> Others telling you how to compile vala code with automake or valac.
>
> However, none of them solve my problems.
> I want to have a project developed with vala and C.
> I need to call the functions and GObjects in C files from vala.

For C from Vala calls, feel free to borrow ideas from Spek:
https://github.com/alexkay/spek

Also check out Sampala: https://github.com/tadeboro/Sampala

> Also, I need to call vala generated objects and functions from my C code as
> well.
> I cannot use the "valac -C --header xxxx.h" trick as valac is called by
> automake.
> In addition, if I write something like this in Makefile.am, it does not
> work.
>
> bin_PROGRAMS=myprog
> myprog_SOURCES= \
>  file1.c \
>  file2.c \
>  file3.vala \
>  file4.vala \
>  file5.c
>
> In this way, C code will be treated as vala, or vala code will be treated as
> C.
> Autotools do not seem to handle this well. What's the correct way to do it?
>
> For calling vala code from C code, a generated *.h file is needed.
> I tried adding "--header xxx.h" to VALA_FLAGS and it seemed to work.
> However, it generated a huge single header file for all *.vala files
> compiled rather than file1.h for file1.vala, file2.h for file2.vala, etc.
> How to generate separate *.h files for every single vala file with
> autotools?
> Or, if this is not supported by autotools, can CMake do this?
>
> I hope these problems can be solved easily so I can do future development in
> Vala rather than having to keep C/GObject.
>
> Thank you all
>
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