embedding ecl without (build-program)

Juraj Variny rini17 at gmail.com
Mon Feb 29 14:20:26 UTC 2016

In the end have hacked it together using c:build-static-library, which leaves 
things to be desired:

(let ((compiler::*USER-CC-FLAGS* "-I... put here $CFLAGS from the build 
    (compiler::*USER-LD-FLAGS* "... put here $LDFLAGS from the build system... 
    (objfile (compile-file "src/common/lisp/lispinterface" :system-p t)))
    (print objfile)
    (print (c:build-static-library "lispinterface" :lisp-files (list objfile) 
:init-name "lispinterface_INIT")))

For example the CFLAGS and LDFLAGS must be synchronized with the build system 
somehow. The resulting liblispinterface.a must be added to linker for whole 
project. Rest of the application then calls only cl_boot and 
lispinterface_INIT like:

cl_object the_block = read_VV(OBJNULL, lispinterface_INIT);

So I'd still like to see ECL function that would do above but only generate 
all C/C++ output file(s) without compiling. 

Currently it's possible only when you specify output for compile-file, (setf 
c::*delete-files* nil) and fish C files out from /tmp.



On Monday 29 February 2016 13:28:09 you wrote:
> Hello,
> Juraj Variny writes:
> > Hello,
> > 
> > Is there is a way for ECL only to generate a bunch of .cpp files that can
> > be fed to existing build system? I'm halfway there by generating C from
> > my (ffi:c-inline) stuff like:
> > 
> > (compile-file "src/common/lisp/lispinterface.lisp" :output-file
> > "src/common/lisp/lispinterface.cpp").
> generally that's how it's done (generating the C files).
> > But how do I initialize it on app startup? Looks like
> > 
> > void init_fas_CODE(cl_object flag)
> > 
> > should be called, but with what parameters?
> I'm afraid that it won't work the way you want it to run. Standalone
> executables (and the shared libraries), still require libecl to run
> (linked either dynamically or statically, note however that static
> linkage results in covering code you link with with LGPLv2).
> > Some background: I am trying to embed ECL in a big C++ app with its own
> > byzantine build system (ftjam with own layer on top of it). These C++
> > functions I am interfacing are not exposed externally (and I prefer not
> > to), thus trying to load .fas file at runtime results in linker error.
> > Also, I can't use (build-program) which won't work together with the
> > build system.
> > 
> > However, if (build-program) knows how to neatly pack whole initialization
> > into one C function, that would solve the problem, too.
> As already said, C code requires ECL runtime (library). Path I would
> suggest would be linking ECL dynamically (providing .so file or .dll
> depending on platform), and loading the code in built FAS file with the
> ECL's si_load_binary.
> Note, that if you don't change the platform nor the ECL, you may
> precompile FAS and load them at your convenience later.
> > Regards,
> > 
> > Juraj
> Best regards,
> Daniel

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