Add .so and .a libraries to Makefile

Question

I have a makefile which looks like this .

DEFINES=-std=c++0x
INCS_GTK=-I/usr/include/gtk-2.0 -I/usr/include/glib-2.0 -I/usr/include/atk-1.0 -I/usr/include/cairo         


        

Answer 1

You can either use an -L flag to tell GCC about the location of any library, and then include it with -l. For example this would be

$ gcc -o main main.c -L/usr/local/lib/ -lYARP_SO

as noted by swair.

Alternatively, you can also supply the full path of the static library and compile directly, like

$ gcc -o main main.c /usr/local/lib/libYARP_OS.a

See 'Shared libraries and static libraries' for details.

In your specific case I would add them to the LDLIBS= line.

NB: Be careful about linking order, this is relevant when linking programs together. See 'Link order of libraries' for details. For example:

$ gcc -Wall calc.c -lm -o calc   (correct order)

works

$ cc -Wall -lm calc.c -o calc    (incorrect order)
main.o: In function `main':
main.o(.text+0xf): undefined reference to `sqrt'

Also see this similar question: How to link to a static library in C?