mosquitto-go-auth: undefined reference to `mosquitto_client_id'

I’m trying to install it on raspberry pi, but i get this:

pi@raspberrypi:~/go/src/mosquitto-go-auth $ make
go build -buildmode=c-archive go-auth.go
go build -buildmode=c-shared -o go-auth.so
# github.com/iegomez/mosquitto-go-auth
/usr/bin/ld: $WORK/b001/_x003.o: in function `mosquitto_auth_acl_check':
auth-plugin.c:(.text+0x3ec): undefined reference to `mosquitto_client_id'
/usr/bin/ld: auth-plugin.c:(.text+0x3f8): undefined reference to `mosquitto_client_username'
collect2: error: ld returned 1 exit status
make: *** [Makefile:3: all] Error 2

can you help me out of this, thank you

About this issue

Original URL
State: closed
Created 4 years ago
Comments: 34 (22 by maintainers)

Commits related to this issue

Add flags for linker before make https://github.com/iegomez/mosquitto-go-auth/issues/91#issuecomment-826943411 — committed to home-assistant/addons by mdegat01 2 years ago
Update mosquitto to 2.0.11 (#2453) * Update mosquitto base image to alpine 3.14 * Replace mosquitto-auth-plug with mosquitto-go-auth * Add flags for linker before make https://github.com/ieg... — committed to home-assistant/addons by mdegat01 2 years ago
(split mosquitto)Update mosquitto to 2.0.11 (#2453) * Update mosquitto base image to alpine 3.14 * Replace mosquitto-auth-plug with mosquitto-go-auth * Add flags for linker before make https... — committed to scolby33/addons by mdegat01 2 years ago

Most upvoted comments

@mkohns Thanks!!!
My host env is ubuntu 18.04, go 1.15.3 ,mosquitto 1.6.12 and go auth 1.1. I successfully build linux/arm target when I modify export CGO_LDFLAGS="-shared -Wl,-unresolved-symbols=ignore-all"
I modify “go build -x -buildmode=c-shared -o go-auth.so”, I saw that cgo attach “-pie” to link parameters which cause this warning when target env is linux/arm.

tercelcn on Nov 15, 2020

Hi, I stumbled across this issue and debugged a bit. I still do not know the root cause for mosquitto-go-auth no building on raspberry pi - but i found a dirty solution for building this setup for rpi4

ENV MOSQUITTO_VERSION=1.6.10 ENV GO_VERSION=1.13.8

The reported linker error from @arctic-alpaca can actually be ignored. The reference is present - no idea why cgo has trouble finding it. With this patch file saved to patch.go-auth.go.rpi4 in docker subdirectoy

2a3
> // #cgo linux armhf LDFLAGS: -Wl,-unresolved-symbols=ignore-all

and this change in Dockerfile

#Copy the patch for rpi
COPY patch.go-auth.go.rpi4 .

#Get / build the plugin.
RUN mkdir mosquitto-go-auth && \
    cd mosquitto-go-auth && \
    git clone https://github.com/iegomez/mosquitto-go-auth.git . && \
    export PATH=$PATH:/usr/local/go/bin && \
    export CGO_CFLAGS="-I/usr/local/include -fPIC" && \
    export CGO_LDFLAGS="-shared" && \
    patch go-auth.go ../patch.go-auth.go.rpi4 && \
    make

The docker image can be build and runs smoothly with the newest version of mosquitto and auth plugin.

I suppose the patch file can be merged into master as the cgo directive should only hit armhf. But please double check.

mkohns on Nov 13, 2020

@arctic-alpaca Thanks for sharing that description, it’ll surely be useful for anyone following your approach!

On the plugin version issue, I just created this PR which I believe fixes it: https://github.com/iegomez/mosquitto-go-auth/pull/103 Nevertheless, I’m waiting on comments in https://github.com/iegomez/mosquitto-go-auth/issues/96 to see if there’s anything else that needs consideration.

Cheers!

iegomez on Oct 22, 2020

Hi! As the readme states, when building for Mosquitto 1.5 or later, you need to export some flags before:

export CGO_CFLAGS="-I/usr/local/include -fPIC"
export CGO_LDFLAGS="-shared"
make

Let me know if that works.

iegomez on Aug 6, 2020