Permission Denied Errors in Go and Makefile: What Lies Beneath?

Permission Issues with Go and Makefile: A Deeper Dive

Permission denied errors can be perplexing, especially when they arise from seemingly straightforward commands. In this case, the discrepancy between running go run . directly and via a Makefile has raised questions.

Root of the Problem

The issue stems from a bug in GNU make. If a directory named go exists in any directory on your PATH, gnulib considers it a directory. As a result, when Makefile attempts to execute go run ., it is incorrectly searching for a directory and encountering permission denied errors.

Verification

To confirm this issue, check your PATH for any directories that contain a go subdirectory. If such a directory exists, it is likely the culprit.

Workaround

If you cannot remove the problematic directory from your PATH or rename it, you can work around the bug by ensuring that Makefile invokes a shell before executing go run .. Adding a semicolon at the end of the command will force Makefile to use a shell.

run:
    go run . ;

Alternative Approach: run2

The reason why run2 works is that it explicitly defines a shell command. By wrapping the go run . command within echo "Make says hello" ;, Makefile is forced to execute the command in a shell, resolving the permission issue.

Debugging with -d and --trace

Using -d or --trace with Makefile provides additional insights into the issue. By examining the output, you can verify the existence of the problematic go directory and the lack of a shell being invoked.

Conclusion

This issue arises from a specific bug in GNU make. By understanding the cause and applying the appropriate workaround, you can navigate this issue and ensure successful execution of your Go programs via Makefile.

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