Question

I want to build a library from multiple source files, like a1.cpp a2.cpp. I used the following command, ‘g++ -o libcode -c a1.cpp a2.cpp’. However, error pop up “cannot specify -o with -c or -S with multiple files”.

In general, how should I build such lib from multiple sources? thanks…

Answer 1

You first compile your source files to objects files (*.o), and then invoke the ar command to build the library. In your example:

   g++ -c a1.cpp a2.cpp
   ar rcs libcode.a a1.o a2.o

This would build a static library, you can also create a dynamic one.

http://www.network-theory.co.uk/docs/gccintro/gccintro_79.html

http://tldp.org/HOWTO/Program-Library-HOWTO/static-libraries.html