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Applying -Werror compiler option to request warnings is an usual way to discover potential errors. Go user may put a cgo directive in preamble: `// #cgo CFLAGS: -Werror=unused-parameter`. However, the directive also takes effect on the cgo generated files. I cleaned _cgo_main.c to help Go user only concentrate on warnings of their own file. Fixes #43639 Change-Id: I9112f02ae5226f2fc87a8650d19faee59cddd588 GitHub-Last-Rev: f09d172f979acfba855be8108e7d79ec2778c406 GitHub-Pull-Request: golang/go#46358 Reviewed-on: https://go-review.googlesource.com/c/go/+/322232 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Trust: Bryan C. Mills <bcmills@google.com>