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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Direção de pesquisa: Examine a geração de código cgo para identificar onde uma variável não utilizada é introduzida ao compilar com Werror=unused variable. Olhe para o código C gerado em torno das funções cgo ... e garanta que a variável seja usada ou que o sinalizador seja tratado corretamente.
Pilha de tecnologia: goc
Domain: compilersbackend
Tipo Issue: Bug
Difficulty: 3
Tempo estimado: 1-3 horas
Status da atividade: Ativo
Clarity: Claro
Prerequisites: GoC compiler
Simpatia para novatos: 65

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