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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Research-Richtung: Untersuchen Sie die cgo Codegenerierung, um zu identifizieren, wo eine ungenutzte Variable bei der Kompilierung mit Werror=unused variable eingeführt wird. Überprüfen Sie den generierten C Code um die cgo ... Funktionen herum und stellen Sie sicher, dass die Variable entweder verwendet oder das Flag korrekt behandelt wird.
Tech Stack: goc
Domain: compilersbackend
Issue Type: Fehler
Schwierigkeit: 3
Geschätzte Zeit: 1-3 Stunden
Aktivitätsstatus: Aktiv
Klarheit: Klar
Voraussetzungen: GoC compiler
Einsteigerfreundlichkeit: 65

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