ilib_for_link

Arguments

names

a string matrix giving the entry names which are to be linked.

files

string matrix giving source files needed for shared library creation.

libs

string matrix giving extra libraries needed for shared library creation

flag

a string flag ("c" or "f") for C or Fortran entry points.

makename

character string. The pathname of the Makefile file without extension (default value '').

This parameter is useless since Scilab 5.0.

A warning will be displayed in Scilab 5.3 if you use another value that the default.

loadername

character string. The pathname of the loader file (default value is loader.sce).

libname

optional character string. The name of the generated shared library (default value is "", and in this case the name is derived from names(1)).

ldflags

optional character string. It can be used to add specific linker options in the generated Makefile. Default value is ""

cflags

optional character string. It can be used to add specific C compiler options in the generated Makefile. Default value is ""

fflags

optional character string. It can be used to add specific Fortran compiler options in the generated Makefile. Default value is ""

cc

optional character string. It can be used to specify a C compiler. Default value is ""

libn

character string. The path of the really generated shared library file.

Description

This tool is used to create shared libraries and to generate a loader file which can be used to dynamically load the shared library into Scilab with the link function. New entry points given by names are then accessible through the call function or with non linear tools ode, optim,...

The file to compile are supposed to be located given by makename. If makename sets a path different to the current directory, loader script must be located in the same directory using the loadername variable.

Many examples are provided in SCI/modules/dynamic_link/examples directory. They are all released into the public domain.

Note that a compiler must be available on the system to use this function.

Languages handle by this function are: C, C++, Fortran and Fortran 90.

On the internal technical level, under GNU/Linux and Mac OS X, the ilib_* function are based on the autotools. First, a configure is executed to detect compilers available. Then, a make is launched with the provided arguments. For more information: Full technical description of the incremental link / dynamic link

Since version 6.0.1, under GNU/Linux, Scilab detects where the libstdc++ is located (thanks to the command gcc -print-search-dirs|awk -F= '$1=="libraries: "{print $2}'). Previously, the dynamic link was using the libstdc++ embedded in Scilab.

Examples (C code)

if haveacompiler() then

chdir(TMPDIR)
f1=['int ext1c(int *n, double *a, double *b, double *c)'
    '{int k;'
    '  for (k = 0; k < *n; ++k) '
    '      c[k] = a[k] + b[k];'
    '  return(0);}'];

mputl(f1,'fun1.c')

//creating the shared library (a gateway, a Makefile and a loader are
//generated.

ilib_for_link('ext1c','fun1.c',[],"c")

// load the shared library

exec loader.sce

//using the new primitive
a=[1,2,3];b=[4,5,6];n=3;
c=call('ext1c',n,1,'i',a,2,'d',b,3,'d','out',[1,3],4,'d');
if norm(c-(a+b)) > %eps then pause,end

end

See also

• addinter — new functions interface dynamic link at run time.
• link — dynamic linker
• ilib_compile — ilib_build utility: executes the Makefile produced by ilib_gen_Make
• ilib_gen_Make — utility for ilib_build: produces a Makefile for building shared libraries
• ilib_gen_gateway — utility for ilib_build, generates a gateway file.
• ilib_gen_loader — utility for ilib_build: generates a loader file
• ilib_build — utility for shared library management

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