| Thanks Jürgen. Now I have another problem. The libAPL (libapl) html documentation first line states: "libapl is a C library,…..” so in theory it should play nicely with Obj-C. But this tiny test C program is causing me a linker problem that I do not understand
#include <stdio.h> #include <dlfcn.h> #include "/usr/local/include/apl/libapl.h" int main(int argc, const char * argv[]) { // insert code here... printf("Hello, World!\n"); dlopen("/usr/local/lib/apl/libapl.so",RTLD_NOW|RTLD_GLOBAL); init_libapl("main", 0); return 0; }
Undefined symbols for architecture x86_64: "_init_libapl", referenced from: _main in main.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)
I typed this in Terminal Gandalf:~ pteeson$ file /usr/local/lib/apl/libapl.so /usr/local/lib/apl/libapl.so: Mach-O 64-bit bundle x86_64 Gandalf:~ pteeson$ nm /usr/local/lib/apl/libapl.so | grep init_libapl 00000000001975a0 T _init_libapl
respect….
Peter
On May 20, 2018, at 9:40 AM, Juergen Sauermann < address@hidden> wrote:
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.
respect
Peter
Hi,
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
it.
Regards,
Elias
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
possible.
respect….
Peter
On May 17, 2018, at 12:10 PM, Peter Teeson
<address@hidden>
wrote:
Hi all:
The following is for svn 1048 ./configure —with-android
—with-libapl
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,
RTLD_LAZY|RTLD_GLOBAL);
if (NULL == libaplHandle) {
char *error = dlerror();
printf("AppDelegate - dlopen(libaplHandle) error:
%s",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
respect…..
Peter
--
Br,
/Alexey
|