cmd/cgo: build failed when any code have CFLAGS: -Werror=unused-vairable · golang/go#8420

2014-07-24T09:45:13.000Z

by **Snyh1010**: 1. What is a short input program that triggers the error? package main //#cgo CFLAGS: -Werror=unused-variable //void test(){} import "C" func main() { C.test() } 2. What is the full compiler output? snyh:shm$go build # _/run/shm ./a.go: In function ‘_cgo_043ca501ac1f_Cfunc_test’: ./a.go:32:49: error: unused variable ‘a’ [-Werror=unused-variable] cc1: some warnings being treated as errors ------------------------------------------ I have fixed this by a CL https://golang.org/cl/118890044/ The CL( https://golang.org/cl/109640045) had fix this problem under gcc. The first time I hasn't notice clang, so when the CL has been submitted, it broken freebsd because clang. And the CL has been undo. The broken problem is not caused by my code, it's appeared upon the submission because the CL contains the test code let the problem appeared. I have fixed the problem both clang and gcc. But it seems no one have confidence to submit it this time, I have send the CL request. Anyway I want the problem be fixed, with or without my CL.

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by Snyh1010:

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調査方針: cgoコード生成を調べて、 Werror=unused variable でコンパイルするときに未使用変数が導入される場所を特定します。 cgo ... 関数の周りの生成されたCコードを確認し、変数が使用されているか、フラグが正しく処理されていることを確認します。
技術スタック: goc
領域: compilersbackend
Issue 種別: バグ
難度: 3
推定時間: 1-3時間
活動状況: アクティブ
明確さ: 明確
前提条件: GoC compiler
初心者向け度: 65

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