Cross compile linux amd64 -> darwin amd64 issues with CGO (`<angled> include; use "quotes" instead`) about piv-go

[ericchiang]

Several of the OSes that don't use pkg-config directly include the PCSC include (it looks like that'd be "/usr/include/PCSC" on your system). You may need to try that

https://github.com/go-piv/piv-go/blob/master/piv/pcsc_unix.go

// #cgo darwin LDFLAGS: -framework PCSC
// #cgo linux pkg-config: libpcsclite
// #cgo freebsd CFLAGS: -I/usr/local/include/
// #cgo freebsd CFLAGS: -I/usr/local/include/PCSC
// #cgo freebsd LDFLAGS: -L/usr/local/lib/
// #cgo freebsd LDFLAGS: -lpcsclite
// #cgo openbsd CFLAGS: -I/usr/local/include/
// #cgo openbsd CFLAGS: -I/usr/local/include/PCSC
// #cgo openbsd LDFLAGS: -L/usr/local/lib/
// #cgo openbsd LDFLAGS: -lpcsclite
// #include <PCSC/winscard.h>
// #include <PCSC/wintypes.h>

See StackOverflow for an explanation of the error: https://stackoverflow.com/a/17466697/2325264

Going to close out for now since cross-compiling CGO is messy (godspeed!) and something I don't think this package want to support directly.

[circa10a]

For those who later find this issue, I was able to resolve using goxx and osxcross which is done via docker. Here's the dockerfile

# syntax=docker/dockerfile:1
FROM --platform=$BUILDPLATFORM crazymax/osxcross AS osxcross

FROM --platform=$BUILDPLATFORM crazymax/goxx AS build
ENV CGO_ENABLED=1 
WORKDIR /go/src/app
ARG TARGETPLATFORM
ARG BINARY_NAME
ARG VERSION
RUN goxx-apt-get update && \
    goxx-apt-get install -y binutils gcc pkg-config libpcsclite-dev
RUN --mount=type=bind,source=. \
  --mount=from=osxcross,target=/osxcross,src=/osxcross,rw \
  goxx-go env && goxx-go build -v -o /out/$BINARY_NAME -ldflags="-X main.Version=$VERSION" .

FROM scratch AS artifact
COPY --from=build /out/$BINARY_NAME /

FROM scratch
COPY --from=build /out/$BINARY_NAME /
ENTRYPOINT [ "/$BINARY_NAME" ]

Then the docker build command:

docker buildx build --platform "darwin/amd64" --build-arg=VERSION=$VERSION --build-arg=BINARY_NAME=$BINARY_NAME --target "artifact" --output "./dist" .

I've had issues doing the same for darwin/arm64 as M1 Macs report damaged binaries and I couldn't find a way around it, however the x64 bit version worked fine thanks to Rosetta.