Inclusion of scicos_block4.h in external toolboxes source files

[Matteo Morelli]

Dear all,

  The following is the description of a second little issue I dealt with
when running the external contribs installation procedure in Scilab-5.x
(see 
http://lists.scilab.org/cgi-bin/ezmlm-browse?list=dev&cmd=threadindex&month=200904&threadid=gnflmlndbinnkpmaclij
if you're interested in the first issue). It occurs both under Windows
and under GNU/Linux.

  Let's take a generic toolbox "for Scilab/Scicos", i.e. a toolbox with
both a Scilab and a Scicos part. It would be good if we could apply the
standart method described at wiki.scilab.org/howto/Create_a_toolbox in
this situation as well. As an example, let's suppose that the file
src/c/csum.c in the toolbox skeleton needs to include the header file
scicos_block4.h. we could do the following:

    #include <scicos_block4.h> /* header file inclusion */
    int csum(double *a, double *b, double *c)
    {
      ...
    }

In order to be able to build the toolbox, we also need to add to CFLAGS
the following directory search option:

    1. -I"$(SCIDIR)\modules\scicos_blocks\includes", in the Windows case

    or

    2. -I$(SCIDIR)/../../include/scilab/scicos_blocks/, in the GNU/Linux
       case.

  Of course, you could say that is up to toolbox developers to handle
this issue, by modifying the src builder with a piece of code like

    if MSDOS then
        ... 1. ...
    else
        ... 2. ...
    end

  However, in my opinion, it would be better if Scilab handled the issue
automatically. For example, under Windows, just add line 1. to the
INCLUDES variable in Makefile.incl.mak will do the job. A similar thing,
I guess, could be done under GNU/Linux to change CFLAGS to something
similar to

    CFLAGS="-I$(SCIDIR)/../../include/scilab/malloc/ 
-I$(SCIDIR)/../../include/scilab/output_stream/ 
-I$(SCIDIR)/../../include/scilab/mexlib/ 
-I$(SCIDIR)/../../include/scilab/core/ " 
CXXFLAGS="-I$(SCIDIR)/../../include/scilab/malloc/ 
-I$(SCIDIR)/../../include/scilab/output_stream/ 
-I$(SCIDIR)/../../include/scilab/mexlib/ 
-I$(SCIDIR)/../../include/scilab/core/ " 
FFLAGS="-I$(SCIDIR)/../../include/scilab/core/ 
-I$(SCIDIR)/../../include/scilab/scicos_blocks/ "

where line 2. has been added to CFLAGS.

  What do you think about this "SEP"? comments or suggestions?

Regards,

--
Matteo