On Sat, Nov 27, 2021 at 11:57 AM Ian Lance Taylor <i...@golang.org> wrote:
> On Sat, Nov 27, 2021 at 11:01 AM David Karr <davidmichaelk...@gmail.com>
> wrote:
> >
> > I'm aware of the "build constraints" mechanism, which lets individual
> files be only compiled on specific oses or architectures.
> >
> > I am constructing an app that has a single cgo module, which is the
> "meat" of the application (longest module). In my poc, the cgo header
> specifies a lib path with "linux" in the path, to point to the linux
> libraries. I haven't constructed a Makefile for this yet, but this works
> well with vscode and simple testing.
> >
> > I now have to consider how to build this on Windows, although the
> deployment target for this will be Linux. I have to allow for testing of it
> on Windows, if possible. I thought perhaps that I could change the lib path
> in the cgo header to reference "${GOOS}" instead, but it doesn't seem to
> recognize that.
> >
> > It's not reasonable to use build constraints for this, because it seems
> like I would have to duplicate the entire module in order to vary the lib
> path. That would be absurd.
> >
> > What are reasonable strategies for this, including facilitating testing
> of it in vscode on both Linux and Windows?
>
> If I'm reading this correctly, you can address this by using
> GOOS/GOARCH build tags in your #cgo comments. See, for example,
> https://go.dev/src/runtime/cgo/cgo.go?#L14. This is documented at
> https://pkg.go.dev/cmd/cgo#hdr-Using_cgo_with_the_go_command.
>
> Ian
>
So you're saying I could do this:
// #cgo linux LDFLAGS: -L${SRCDIR}/../lib/linux -llib1 -llib2 -llib3
-llib4
// #cgo windows LDFLAGS: -L${SRCDIR}/../lib/windows -llib1 -llib2
-llib3 -llib4
If so, that would be much better than duplicating the entire file. It looks
a little odd to duplicate the library list, but if that's the best we can
do, I guess that's it.
I'll test this later.
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