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Re: [Bug-apl] libapl load problem....UPDATE

From: Juergen Sauermann
Subject: Re: [Bug-apl] libapl load problem....UPDATE
Date: Sun, 20 May 2018 15:40:48 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:52.0) Gecko/20100101 Thunderbird/52.3.0

Hi Peter,

thanks, I have added  a typedef in libapl.h. SVN 1049.

/// Jürgen

On 05/19/2018 09:53 PM, Peter Teeson wrote:
Thank you all for your replies. I removed the configure arg —with-android.
Now there is no error from dlopen() or dlclose() or dlsym() .

But we have a new problem… in this code libapl.h is missing a define for APL_Float.

#include "/usr/local/include/apl/libapl.h"
int main(int argc, const char * argv[]) {

    return 0;

However if I add the followed 2 lines (copied from lines 72-73 in APL_Types.hh) everything preprocesses just fine.

typedef double APL_Float_Base;
typedef APL_Float_Base APL_Float;
#include "/usr/local/include/apl/libapl.h"

int main(int argc, const char * argv[]) {

    return 0;

Looking at the source code in APL_Types.hh I notice 

line 39 #define APL_Float_is_class 0
and this in lines 62 -80
/// One (real) APL floating point value.
#if APL_Float_is_class // APL_Float is a class

#include "APL_Float_as_class.hh"

inline void release_APL_Float(APL_Float * x)   { x->~APL_Float(); }

#else   // APL_Float is a POD (double)

typedef double APL_Float_Base;
typedef APL_Float_Base APL_Float;

#define complex_exponent(x) exp(x)
#define complex_power(x, y) pow((x), (y))
#define complex_sqrt(x)     sqrt(x)
#define release_APL_Float(x)

#endif // APL_Float is class vs. POD

From this I conclude that somehow the typedefs weren’t included in the pre-processing/compiling of libapl
Not quite sure how to track this down any further.


 <address@hidden> wrote:


Last time I had a similar problem I had to run
autoconf/autoreconf/something like this to regenerate configure on OSX.

Elias Mårtenson <address@hidden> writes:

I don't think so. I believe the reason is that you're not compiling
with a flat namespace.

If I recall correctly OSX uses a different name resolution system
by default where symbols from one library doesn't automatically
become part of the namespace of another.

There were some magic flags one can use with the linker to get
the normal behaviour from Linux, but I have no idea how it
works. I don't use OSX anymore so I can't really experiment with


On Fri, 18 May 2018, 08:14 Peter Teeson,
<address@hidden> wrote:

I’ve been thinking about this and I believe it’s probably
because libapl.so is C++ but Cocoa is Obj-C.
Pure C plays nicely with Obj-C but there needs to be
wrappers for C++ to play nicely with Obj-C.
So while I wait for your wise replies I will research what to
do to use C++ dlls in Obj-C; I don’t even know if that is



On May 17, 2018, at 12:10 PM, Peter Teeson
<address@hidden> wrote:

Hi all:
The following is for svn 1048 ./configure —with-android
Using MacOS Yosemite 10.10.5 and Xcode 6.4 and a
vanilla Cocoa Document app.

In the AppDelegate code I have the following:

void *libaplHandle; // plain C file pointer

- (void)applicationDidFinishLaunching:(NSNotification
*)aNotification {
// Load libapl from default location.
const char* libaplPath="/usr/local/lib/apl/libapl.so"; // TO
DO Make this path a User Preference....}

libaplHandle = dlopen(libaplPath,
if (NULL == libaplHandle) {
char *error = dlerror();
printf("AppDelegate - dlopen(libaplHandle) error:

AppDelegate - dlopen(libaplHandle) error:
dlopen(/usr/local/lib/apl/libapl.so, 9): Symbol
not found: _CERR
Referenced from: /usr/local/lib/apl/libapl.so
Expected in: flat namespace
in /usr/local/lib/apl/libapl.so

I really have no idea why this happens. Please
educate me…..

Thanks and




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