Dynamic Linking for MacOS?

BlitzMax Forums/BlitzMax Programming/Dynamic Linking for MacOS?

Morbius

(Posted 2006) [#1]

Is there such a thing as dynamic linking for MacOS, Linux? It seems many licenses restrict static linking.

Thanks

Mike

skidracer

(Posted 2006) [#2]

Yes.

The following illustrates the use of the python shared library using the dynamic linking instructions dlopen and dlsym:

Extern "C"
Function dlopen:Byte Ptr(libname$z,mode)
Function dlsym:Byte Ptr(handle:Byte Ptr,symbol$z)
End Extern

Const PylibName$="libpython.dylib"

Const RTLD_DL_SYMENT=1
Const RTLD_DL_LINKMAP=2

Const RTLD_LAZY=1 'Lazy Function call binding
Const RTLD_NOW=2 'Immediate Function call binding
Const RTLD_BINDING_MASK=3 ' Mask of binding time value
Const RTLD_NOLOAD=4 ' Do Not load the object.
Const RTLD_DEEPBIND=8 'Use deep binding
Const RTLD_LOCAL=0
Const RTLD_GLOBAL=$100
Const RTLD_NODELETE=$1000

Local pylib:Byte Ptr=dlopen(PylibName,RTLD_GLOBAL|RTLD_NOW)

If Not pylib Throw PylibName+" library not found"

Print "python loaded"

Local Py_Initialize()
Local PyRun_SimpleString(script$z)
Local Py_InitModule4:Byte Ptr(name$z,methods:Byte Ptr,doc:Byte Ptr,PyObject:Byte Ptr,apiver)
Local Py_Finalize()

Py_Initialize=dlsym(pylib,"Py_Initialize")
Py_Finalize=dlsym(pylib,"Py_Finalize")
PyRun_SimpleString=dlsym(pylib,"PyRun_SimpleString")

Py_Initialize
PyRun_SimpleString "print ~qHello from Python~q"
Py_Finalize

Morbius

(Posted 2006) [#3]

Awesome. Thanks for the example!

Brucey

(Posted 2007) [#4]

If you want "proper" dynamic linking, as per the -l option that the linker uses (like in Max on Linux), see this post for a description on what to change in bmk to allow it.

:-)