Re: [Chicken-users] compile .scm for android

[Jin Cao]

    Hi Rafeal, 
    Sorry for late reply. Your Makefile is useful. I managed to compile
    .scm for android, but I am stuck in another problem:
    
    As ndk provided an interface for java, code written in c would be a
    normal function be called by java jni.
    Something like:
    
    /* jni code which calls the function fact compiled from fact.scm
    code in shared library */
    int
    func(int i)
    {
        CHICKEN_run(C_toplevel);
        return fact(i) + 1;
    }
    
    
    ;; fact.scm
    (define (facts n)
      (if (= n 0)
          1
          (* n (facts (- n 1)))))
      
    (define-external (fact (int n)) int
      (display "fact is called\n")
      (facts n))
    (return-to-host)
    
    
    When the func is invoked once, this works fine. But 'Segmentation
    fault' will be encountered if func is invoked more than once. Note
    that CHICKEN_run() is executed in func(), but not main() as in c. 
    
    My question is that can compiled scheme procedure be invoked as
    normal function? 
    
    It seems that the compiled procedure need the runtime chicken
    environment, and CHICKEN_run() must execute once. 
    
    Are these possible?
    1. run compiled scheme without chicken runtime, or
    2. let CHICKEN_run() be executed in the "right way"
    
    Since I am new to both chicken and android, if I miss something or
    do not well understand the mechanism of chicken, please let me know.
    
    Any suggestion would be appreciated.
    
    Regards,
    Lop

On 03/08/2016 06:57 AM, F. Rafael Leon wrote:

I attach a Makefile for Android, building on Linux with NDK.

ndk-build must be on the path. It auto-detects almost everything else.

It builds libsharedlib.so from sharedlib.scm.

Inside of sharedlib.scm, include a.scm, b.scm, c.scm as dependencies:

(include "a.scm")
(include "b.scm")
(include "c.scm")

You will need to edit the CHICKEN_INC and CHICKEN_LIB paths to your
pre-built Android chicken.h and Android libchicken.so.

I was expecting this question to appear on the mailing list.

    -Rafael

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