Static binary with c lib dep. Is it possible?

[Marcondes Viana de Oliveira Junior]

Hi all, I’m trying to create a static binary (no external deps) for linux, on linux, using libwebp as dep.

webp.go

=======
...
/*
 #cgo pkg-config: libwebp
 #include <webp/encode.h>
 #include <stdlib.h>
...
*/

import "C"
...

=======
And I wand to generate a static linked bin.

If I use CGO_ENABLED=0

=======
... build constraints exclude all Go files in ...
=======

If I use

=======
go build -o bin/api \
    -ldflags -extldflags=-static \
    ...
=======
A giant error comes:
=======
...
/usr/local/go/pkg/tool/linux_amd64/link: running gcc failed: exit status 1
/usr/bin/ld: /tmp/go-link-3823308014/000004.o: in function `_cgo_cbcce81e6342_C2func_getaddrinfo':
/tmp/go-build/cgo-gcc-prolog:58: warning: Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
...
=======

If I just run go build, it compiles and run perfectly but
=======

$ ldd bin/api | wc -l
7

=======

I’m not sure if is it even possible, but is there something that can be done?

[Ian Lance Taylor]

If you can build a C program statically with that library, then you
can build a Go program statically. But in general glibc does not like
to be linked statically, and that is what you are running into with
the getaddrinfo warning. You could consider using an alternative C
library like musl.

Ian

[Marcondes Viana de Oliveira Junior]

Thanks Ian, got it.