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 评论) (0 反应) (0 负责人)Go (19,008 fork)batch import

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by Snyh1010:

贡献者指南

研究方向: 检查cgo代码生成，找出在编译时使用 Werror=unused variable 时引入未使用变量的位置。查看 cgo ... 函数周围的生成C代码，确保变量被使用或正确处理该标志。
技术栈: goc
领域: compilersbackend
议题类型: 缺陷
难度: 3
预计时间: 1-3 小时
活动状态: 活跃
清晰度: 清晰
前置要求: GoC compiler
新手友好度: 65

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