# Issue 63559: building with -buildmode=default should produce
# a binary identical to one built with the buildmode that default
# resolves to, and the build info stamped into the binary should
# record the resolved buildmode.

[short] skip 'links binaries'
# gccgo does not set -fPIE for the default->pie case (unlike explicit
# -buildmode=pie), so the two binaries would not be identical there.
[compiler:gccgo] skip

# Build with -buildmode=default and, separately, with the buildmode that
# default resolves to. Use distinct build caches so that the second build
# cannot be served from the first build's link cache: the binaries must be
# byte-identical because they are truly reproducible, not because one was
# copied from the other.
env GOCACHE=$WORK/cache-default
go build -buildmode=default -o default$GOEXE .

env GOCACHE=$WORK/cache-explicit
[!default-pie] go build -buildmode=exe -o explicit$GOEXE .
[default-pie] go build -buildmode=pie -o explicit$GOEXE .

cmp -q default$GOEXE explicit$GOEXE

# The build info must record the resolved buildmode, not the literal "default".
go version -m default$GOEXE
[!default-pie] stdout -buildmode=exe
[default-pie] stdout -buildmode=pie

-- go.mod --
module m

go 1.26
-- main.go --
package main

func main() {}