cgo: malformed DWARF TagVariable entry [1.18 backport]

[gopherbot]

@crazy-max requested issue #53000 to be considered for backport to the next 1.18 minor release.

@gopherbot please backport to 1.18.

[thaJeztah]

^^ to add some context

We started running into this issue after the official docker golang alpine image updated to alpine 3.17, which comes with a newer version of clang (see moby/moby#44570);

With alpine 3.16:

docker run -it --rm golang:1.18.8-alpine3.16 sh -c 'apk add --quiet --no-cache clang && clang --version'
Alpine clang version 13.0.1
Target: aarch64-alpine-linux-musl
Thread model: posix
InstalledDir: /usr/bin

With alpine 3.17:

docker run -it --rm golang:1.18.8-alpine3.17 sh -c 'apk add --quiet --no-cache clang && clang --version'
Alpine clang version 15.0.6
Target: aarch64-alpine-linux-musl
Thread model: posix
InstalledDir: /usr/bin

If you have docker installed, the issue can be reproduced with this Dockerfile;

ARG ALPINE_VERSION

FROM golang:1.18.8-alpine${ALPINE_VERSION} AS golatest
RUN apk add --no-cache clang lld git musl-dev gcc
WORKDIR /containerd
RUN set -ex \
 && git clone https://github.com/containerd/containerd.git . \
 && git fetch origin \
 && git checkout -q v1.5.11 \
 && CGO_ENABLED=1 CC=clang go build -tags no_btrfs ./cmd/containerd

With alpine 3.16 (clang 13), it passes;

docker build -t example --build-arg ALPINE_VERSION=3.16 .
...

And with alpine 3.17 (clang 15), it fails:

docker build -t example --build-arg ALPINE_VERSION=3.17 .
...
 > [4/4] RUN set -ex  && git clone https://github.com/containerd/containerd.git .  && git fetch origin  && git checkout -q v1.5.11  && CGO_ENABLED=1 CC=clang go build -tags no_btrfs ./cmd/containerd:
#8 0.261 + git clone https://github.com/containerd/containerd.git .
#8 0.271 Cloning into '.'...
#8 15.91 + git fetch origin
#8 16.44 + git checkout -q v1.5.11
#8 17.02 + CGO_ENABLED=1 CC=clang go build -tags no_btrfs ./cmd/containerd
#8 28.33 # github.com/miekg/pkcs11
#8 28.33 cgo: malformed DWARF TagVariable entry
------
process "/bin/sh -c set -ex  && git clone https://github.com/containerd/containerd.git .  && git fetch origin  && git checkout -q v1.5.11  && CGO_ENABLED=1 CC=clang go build -tags no_btrfs ./cmd/containerd" did not complete successfully: exit code: 2

We noticed that #53013 (https://go.dev/cl/454415 ) was accepted to be backported, which seems related, so we would like to request https://go.dev/cl/406816 to be backported as well.

[ianlancetaylor]

This seems fine to me.

[gopherbot]

Change https://go.dev/cl/455055 mentions this issue: [release-branch.go1.18] cmd/cgo: allow DW_TAG_variable's with no name

[gopherbot]

Change https://go.dev/cl/455056 mentions this issue: [release-branch.go1.18] cmd/cgo: allow DW_TAG_variable's with no name

[gopherbot]

Closed by merging e6adccb to release-branch.go1.18.