使用libc而不是glibc的Golang c-archive

Question

Is it possible?

I have the following Go function I'd like to call from a C program:

// package name: test
package main

import "C"

//export Start
func Start() {
    println("Hello world")
}

func main() {
}

I'm using the following command to build the archive

go build -buildmode=c-archive -o test.a main.go

Using gcc I can get this C program working:

#include <stdio.h>
#include "test.h"

int main() {
  Start();
  return 0;
}

I'm using the following command to build the executable:

gcc main.c sdlgotest.a -o main -lpthread

This all works fine for amd64, but I'd like to use this archive in a aarch64 targed development environment (using libtransistor)

libtransistor build system uses LLVM but it has it's own set of standard includes (libc, etc.) and it doesn't use glibc.

So when I'm trying to get libtransistor to link my archive I get the following errors:

/usr/lib/llvm-5.0/bin/ld.lld: error: undefined symbol: stderr
>>> referenced by gcc_libinit.c:29
>>>               000006.o:(x_cgo_sys_thread_create) in archive ./sdlgotest.a

/usr/lib/llvm-5.0/bin/ld.lld: error: undefined symbol: stderr
>>> referenced by gcc_libinit.c:29
>>>               000006.o:(x_cgo_sys_thread_create) in archive ./sdlgotest.a

libtransistor by the way is compiling the code with flags like this:

-nostdlib -nostdlibinc -isystem /opt/libtransistor/include/

So I guess the problem is that the linker can't resolve those glibc symbols.

Is there a way to compile the Go runtime without those glibc symbols so I can use the archive like I intend to? (without relying on GCC toolchain or glibc)

Answer 1

From the docs:

The default C and C++ compilers may be changed by the CC and CXX environment variables, respectively; those environment variables may include command line options.

So I'd try something like

$ CC=clang go build -buildmode=c-archive -o test.a main.go

and see what happens.