cgo build error - undefined symbol fcntl

[dunrix]

Attempt to write a simple call to (musl?) C function, fails to compile at linking stage. TinyGo 0.24.0 Linux x86_64

package main

/*
#include <clang-c/Index.h>
#include <llvm/Config/llvm-config.h>
#include <stdio.h>
*/
import "C"

func main() {
        // spawn `ls` command - list directory contents
	var cmd = C.CString("ls")
	prc := C.popen(cmd, C.CString("r"))
	C.pclose(prc)

	print(C.LLVM_VERSION_STRING, "\n")
}

tinygo build results in following error

tinygo:ld.lld: error: undefined symbol: fcntl

referenced by popen.c:42 (/usr/lib/tinygo/lib/musl/src/stdio/popen.c:42) popen.c.o:(popen) in archive /home/user/.cache/tinygo/musl-x86_64-unknown-linux-x86-64/lib.a referenced by popen.c:59 (/usr/lib/tinygo/lib/musl/src/stdio/popen.c:59) popen.c.o:(popen) in archive /home/user/.cache/tinygo/musl-x86_64-unknown-linux-x86-64/lib.a

Is it just not yet implemented or is there some other way how to link the C lib?

[aykevl]

It is not implemented. Probably the only thing needed is to include some more files in https://github.com/tinygo-org/tinygo/blob/release/builder/musl.go#L108.

Why are you doing this? Is it because os/exec doesn't work yet?

[dunrix]

@aykevl Thanks for the reply and yes, I'd like to spawn an external command and catch its output. Adapt original Go program which uses os/exec.