Hello everybody:

I want to try to use static library (libssss.a)from other company.I include the head file in my application and I try to compile with the command

g++ test.cpp -L. -lssss -o ssss

It doesn't work and there are always so many errors one of them is as follows:

/tmp/ccPulUf.o(.text+0xe9e): In function main :
:undefined reference to 'sv_point::norm() const'

libssss.a file was written in C++ so it should be no problem with the extern "C"

Any help would be very appreciated!