python - Is f1(const char* str) different from f1(char* str) when applying SWIG to C++? -

i applying swig convert c++ library python library.

i have header file , source file (trivial things omitted):

test.h

void f1(char* str); 

test.cc

void f1(const char* str) {     /* */ } 

when build it, not throw errors or warnings such mismatch.

but when import module generated swig in python:

>>> import (mymodule)  importerror: /usr/local/lib/libmymodule.so: undefined symbol: _zn2f14str12iii 

an error above occurs.

but, after fixing header , source have same arguments, const char* str, error has been solved.

what wonder is, then, why c++ compiler , builder not throw error or warning, put thing becomes problem in swig , python.

indeed, char* , const char* different types.

you've declared 2 overloaded functions, , defined one. that's not error, long don't try call or otherwise use undefined one. if do, you'll link-time error; since you've built dynamic library, detected when library loaded - in case, python interpreter.