April 7, 2026 - Cgo enables the creation of Go packages that call C code.

C code can call exported Go functions with their explicit name. But if a C-program wants a function pointer, a gateway function has to be written. This is because we can’t take the address of a Go function and give that to C-code since the cgo tool will generate a stub in C that should be called.

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March 17, 2011 - Cgo lets Go packages call C code.

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//go:linkname _cgo_callers _cgo_callers · //go:linkname _cgo_set_traceback_functions _cgo_set_traceback_functions · //go:linkname _cgo_call_traceback_function _cgo_call_traceback_function · //go:linkname _cgo_call_symbolizer_function _cgo_call_symbolizer_function ·

C code can call exported Go functions with their explicit name. But if a C-program wants a function pointer, a gateway function has to be written. This is because we can't take the address of a Go function and give that to C-code since the cgo tool will generate a stub in C that should be called.

Package cgo contains runtime support for code generated by the cgo tool.

Package cgo contains runtime support for code generated by the cgo tool.

October 9, 2023 - CGO is provided with Go, but you'll need a C compiler like GCC on Ming (for Windows).

January 18, 2016 - One of the goals of Go was to produce a language who’s build process was self describing; the source of your program contains enough information for a tool to build the project. This is not to say that using a Makefile to automate your build workflow is bad, but before cgo was introduced into a project, you may not have needed anything but the go tool to build and test.

All the cgo CPPFLAGS and CFLAGS directives in a package are concatenated and used to compile C files in that package. All the CPPFLAGS and CXXFLAGS directives in a package are concatenated and used to compile C++ files in that package. All the LDFLAGS directives in any package in the program ...

Golang User Group Berlin · Twitter: @der_ak · Go is meant to be a practical language · Integration with existing software, infrastructure and protocols necessary · Ability to use existing C code is crucial for success (case in point: C++) Go's solution: cgo ·

To mentions some other problem areas that got solved nicely: Great re-usability supported by a nice Module system, Concurrency just works, very few run time issues due to a strict static type system (not even generics), and for all friends of C it has Structs that can be bound to functions. And then there are the two most important feature for this article: (1) Testing is build in. It's as simple as putting a Test* function into a *_test.go file and execute go test. (2) You can call C code from Go and vice versa using CGO.

C.CString is a cgo function that takes a go string and returns a pointer to a C char, ie: *C.char. This allows us to pass strings to C code. Note that this function uses malloc to create the space for the string, so we need to call the C function free once we are done with the string to prevent memory leaks.

May 25, 2023 - Recently, I needed to debug a particularly nasty interaction between two programs, one of which was a go tool. To get further in understanding the issue, I had to compile a little test program with cgo, the dreaded (by go programmers) compilation mode that allows go programs to call C code.

January 18, 2024 - CGO is a way to call C code from Go. It helps call existing C libraries or for performance reasons.

December 3, 2017 - Cgo is really good. If you’ve worked with C libraries in other languages, I expect you already know it’s not always much fun. But Cgo is pretty easy to use, makes a lot of the hard work easy, and can appear to make working with a C library at the code level just like working with Go code.