Date: Fri, 29 Nov 2019 23:13:08 +0100
From: Wolf <wolf@wolfsden.cz>
To: ~alpine/devel@lists.alpinelinux.org
Subject: community/go and buildmode pie
Message-ID: <20191129221308.hy6ybayxu2nsu5dy@wolfsden.cz>
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Hello,
when trying to complie something using the community/go package I'm
always getting this warning:

	# foo
	loadinternal: cannot find runtime/cgo

go package in community uses buildmode pie by default due to this patch:

https://gitlab.alpinelinux.org/alpine/aports/blob/master/community/go/defau=
lt-buildmode-pie.patch

When looking into why I traced it down to

https://gitlab.alpinelinux.org/alpine/aports/commit/9515100a5f4a9ad7b6b1d44=
a5fb9a7b1a6083aa7

which sadly has no explanation *why* this was commited. Due to this
patch there is warning while compiling any go source without any flags.
Example project:

	/tmp/repro # tree .
	.
	=E2=94=9C=E2=94=80=E2=94=80 go.mod
	=E2=94=94=E2=94=80=E2=94=80 test.go

	0 directories, 2 files
	/tmp/repro # cat go.mod
	module foo

	go 1.12
	/tmp/repro # cat test.go
	package main

	func main() {
	}

when one starts clean alpine container and tries to compile it

	+   $ docker run --rm --init -it --mount type=3Dbind,src=3D/tmp/repro,dst=
=3D/tmp/repro alpine
	Unable to find image 'alpine:latest' locally
	latest: Pulling from library/alpine
	89d9c30c1d48: Pull complete
	Digest: sha256:c19173c5ada610a5989151111163d28a67368362762534d8a8121ce95cf=
2bd5a
	Status: Downloaded newer image for alpine:latest
	/ # apk update
	fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/main/x86_64/APKINDEX.tar.=
gz
	fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/community/x86_64/APKINDEX=
=2Etar.gz
	v3.10.3-66-g967440f6a7 [http://dl-cdn.alpinelinux.org/alpine/v3.10/main]
	v3.10.3-64-g77cd149615 [http://dl-cdn.alpinelinux.org/alpine/v3.10/communi=
ty]
	OK: 10341 distinct packages available
	/ # apk add go musl-dev
	(1/12) Installing binutils (2.32-r0)
	(2/12) Installing gmp (6.1.2-r1)
	(3/12) Installing isl (0.18-r0)
	(4/12) Installing libgomp (8.3.0-r0)
	(5/12) Installing libatomic (8.3.0-r0)
	(6/12) Installing libgcc (8.3.0-r0)
	(7/12) Installing mpfr3 (3.1.5-r1)
	(8/12) Installing mpc1 (1.1.0-r0)
	(9/12) Installing libstdc++ (8.3.0-r0)
	(10/12) Installing gcc (8.3.0-r0)
	(11/12) Installing go (1.12.12-r0)
	(12/12) Installing musl-dev (1.1.22-r3)
	Executing busybox-1.30.1-r2.trigger
	OK: 391 MiB in 26 packages
	/ # cd /tmp/repro
	/tmp/repro # go build ./...
	# foo
	loadinternal: cannot find runtime/cgo

Those last two lines are the issue.

I guess my question is how to proceed. Should I just post patch dropping
the default pie to aports mailing list? Or is this something that you
want to keep? If so, how to proceed about the warning?

Thanks for your time,
W.

--=20
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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