与库链接的C程序

Question

I am trying to link a Library to my C program but I can't make it work according to the library doc https://jansson.readthedocs.io/en/latest/gettingstarted.html#compiling-and-installing-jansson all I have to do is put pkg-config --cflags --libs jansson after GCC in the Makefile, but I get the following error :

make -C pkg-config --cflags --libs jansson src
make: invalid option -- '/' make: invalid option -- 'u' make: invalid option -- '/' Usage: make [options] [target] ...

Answer 1

Inside your Makefile do something like this:

LIBS = $(shell pkg-config --libs jansson)
CFLAGS = $(shell pkg-config --cflags jansson)

Then, inside your targets (where you compile/link your code) use it following way:

cc ... $(LIBS) $(CFLAGS)

If you are looking for Makefile sample, take a look here:

http://www.owsiak.org/fortran-and-gnu-make/

It is not exactly what you are looking for, but it should give you some ideas about Makefile structure, targets, wildcards, etc. It's Fortran based, but I am pretty sure you can easily read it.