Simple example on how to link a locally built C-library to a Go application using cgo.
The demo consists of a wrapper C-module cwrap.c which wraps all calls to the library: Usually a C-library consists of different files where include-paths are passed to the compiler via -I and thus not explicitly listed in #include directives. This would not easily work when using C-modules with Go since go build isn't easily fed include directories.
Another module module.go uses these C-functions and also exports a function that is called from within the C-module. It demonstrates all the quirks of unallowed whitespaces before the export comment or no newline before import "C".
Make sure to put this repo into your $GOPATH or simply append link-lib to your GOPATH using export GOPATH=$GOPATH:$(pwd)
export GOPATH=$GOPATH:$(pwd)
cd src/submodule/clib
make clean && make
cd ../../
go build
./src
It should then output
in wrap_lib: wrap_init
Hi from C
Hello from Go!
Remark: Obviously you need to have Go installed. For building the C-library you'll need GCC or any other compiler. Check the
makefileinlink-lib/src/submodule/clib/makefilefor the required tools.