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.

(6 留言) (0 反應) (0 負責人)Go (19,008 fork)batch import

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by Snyh1010:

貢獻者指南

研究方向: 檢查cgo程式碼生成，找出在編譯時使用 Werror=unused variable 時引入未使用變數的位置。查看 cgo ... 函數周圍的生成C程式碼，確保變數被使用或正確處理該標誌。
技術棧: goc
領域: compilersbackend
議題類型: 錯誤
難度: 3
預計時間: 1-3 小時
活動狀態: 活躍
清晰度: 清晰
前置要求: GoC compiler
新手友善度: 65

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