Clips and C++

[Diana Chen]

Hello,

I'm starting out as a new user to clips and C++, and I'm having trouble get the two languages to mix. I tried compiling the C files as C++ after deleting the main.c

I used:

g++ *.c -o test -lm -x c++

But I got the error:

/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
(.text+0x20): undefined reference to `main'

collect2: error: ld returned 1 exit status

Can you help? Also, is there documentation of step by step compiling and using clips in c++?

Thank you!

Diana

[CLIPS Support]

The CLIPS source code is both valid C and C++ code so all you have to do to compile it with a C++ compiler is to specify that the C source files should be compiled as C++ files:

$ g++ -o clips -x c++ *.c -lstdc++

$ ./clips

         CLIPS (6.31 6/12/19)

CLIPS> (exit)

$

If you remove the file main.c and don't provide an alternate main routine in another file, then the linker will generate an error when trying to create the executable because there's no starting point for the program:

$ g++ -o clips -x c++ *.c -lstdc++

Undefined symbols for architecture x86_64:

  "_main", referenced from:

     implicit entry/start for main executable

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

$