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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Direction de recherche: Examinez la génération de code cgo pour identifier où une variable inutilisée est introduite lors de la compilation avec Werror=unused variable. Regardez le code C généré autour des fonctions cgo ... et assurez vous que la variable est utilisée ou que le drapeau est correctement traité.
Stack technique: goc
Domaine: compilersbackend
Type d'issue: Bug
Difficulté: 3
Temps estimé: 1-3 heures
Statut d'activité: Active
Clarté: Claire
Prérequis: GoC compiler
Accessibilité débutant: 65

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