go: cmd/go: error isn't properly reported when running go list on cgo package with missing pkg-config

What version of Go are you using (go version)?

$ go version
go version go1.13.3 darwin/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/muir/Library/Caches/go-build"
GOENV="/Users/muir/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/muir/projects/<project>/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/_q/1xpb0k992ll803xsldpx0qyr0000gn/T/go-build252385107=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

I opened a non-cgo package in our project. The package does not transitively depend on any cgo packages.

What did you expect to see?

I expected gopls to load the package with no issue.

What did you see instead?

gopls failed to create the view due to a go list “missing pkg-config” error.

LSP :: Error loading workspace folders (expected 1, got 0)
failed to load view for file:///Users/muir/projects/<project>/go/src: error loading packages: go [list -e -json -compiled=true -test=true -export=false -deps=true -find=false -- ./...]: exit status 2: # pkg-config --cflags  -- <bunch of libraries>
pkg-config: exec: "pkg-config": executable file not found in $PATH

Elsewhere, our project has a cgo package that uses the cgo pkg-config directive (e.g. // #cgo pkg-config: some-library). My laptop doesn’t currently have pkg-config installed.

I assume the error comes from the go list ./... we do now when creating a view.