如何从命令行链接 C++ 库

Question

I am making C++ library that has multiple headers (all headers having ah, .cpp, and.o file), how do I make the library linkable so that the user can compile it like: g++ main.cpp -o binaries -l libraryName ?

Answer 1

how do I make the library linkable

Like so:

ar ruv libraryName.a foo.o bar.o baz.o

This is best achieved by writing a Makefile , which will automate the build process for you. Something like this:

all: libraryName.a
clean:
        rm -f *.o  # important: use TAB, not spaces for indentation here.

SRCS = foo.cpp bar.cpp baz.cpp
OBJS = ${SRCS:.cpp=.o}

libraryName.a: ${OBJS}

PS To use libraryName.a , do this:

g++ -o exename main.cpp -lbraryName

and not this (requires library named liblibraryName ):

g++ -o exename main.cpp -l libraryName