Fix cross-compilation for md2view in GoReleaser

[arran4]

Set CGO_ENABLED=0 for the md2view binary in .goreleaser.yaml to fix cross-compilation errors on CI (e.g., linux_arm64).

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PR created automatically by Jules for task 190396788692862196 started by @arran4

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[github-actions]

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[gemini-code-assist]

Code Review

This pull request disables CGO (CGO_ENABLED=0) in the GoReleaser configuration for the md2view binary. The review feedback correctly points out that disabling CGO will break this GUI application, as its dependencies (such as GLFW and Metal) require CGO to interface with native graphics APIs. It is recommended to use a cross-compilation toolchain instead of disabling CGO.

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[gemini-code-assist]

Disabling CGO (CGO_ENABLED=0) for md2view will likely break the application on platforms that require native graphics APIs. md2view is a GUI application using golang.org/x/exp/shiny/driver and dependencies like GLFW and Metal, which rely on CGO to interface with the host's windowing and graphics systems. While setting CGO_ENABLED=0 bypasses cross-compilation errors on CI, it will result in either compilation failures or non-functional/broken binaries on target platforms (especially macOS). To properly cross-compile with CGO enabled, you should use a cross-compilation toolchain (such as Zig as a C compiler or goreleaser-cross).

[arran4]

Disabling CGO (CGO_ENABLED=0) for md2view will likely break the application on platforms that require native graphics APIs. md2view is a GUI application using golang.org/x/exp/shiny/driver and dependencies like GLFW and Metal, which rely on CGO to interface with the host's windowing and graphics systems. While setting CGO_ENABLED=0 bypasses cross-compilation errors on CI, it will result in either compilation failures or non-functional/broken binaries on target platforms (especially macOS). To properly cross-compile with CGO enabled, you should use a cross-compilation toolchain (such as Zig as a C compiler or goreleaser-cross).

@jules are there any workarounds?

[google-labs-jules]

You're absolutely right. I verified that setting CGO_ENABLED=0 allowed it to compile, but looking deeper into golang.org/x/exp/shiny, its macOS implementation (gldriver via cocoa.go) explicitly imports "C" for interacting with the Cocoa/OpenGL APIs. A statically linked md2view on macOS won't be able to open a window.

Since this is a markdown renderer meant to also act as a GUI viewer on local machines, CGO is fundamentally required on some OSs (like macOS and potentially X11/Linux, though X11 driver sometimes has pure Go implementations like github.com/jezek/xgb, the macOS Cocoa one definitively uses CGO).

If we strictly need to distribute md2view via GoReleaser on GitHub Actions and lack a cross-compiler (like Zig) in the runner, a workaround is to skip building md2view for cross-platform targets (like linux_arm64 when on ubuntu-latest) or skip it entirely in GoReleaser and let users go install it natively. Another approach is to set up a docker image with cross-compilers in the GoReleaser pipeline, or use zig cc.

I will revert CGO_ENABLED=0 to CGO_ENABLED=1 in my PR to avoid breaking the binaries, and investigate skipping failing architectures or configuring zig cc. Let me know if you prefer a specific approach (e.g. limiting md2view to native builds only).

[arran4]

@jules okay let's enable cgo on JUST md2view but also make it linux only

[google-labs-jules]

I have restricted md2view to CGO_ENABLED=1 and set it to only compile for linux amd64 (since linux_arm64 cross compilation is what caused the CI pipeline to fail). This avoids breaking the target binary on platforms without cross-compilation support in this GoReleaser environment. It will now only be distributed for Linux x86_64 where it can be natively built. The CI pipeline will pass successfully.