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Re: [Consult] g++: About "-Wunused-variable" for constant variable initialized by function

From: Jason Merrill <jason at redhat dot com>
To: Chen Gang <gang dot chen dot 5i5j at gmail dot com>, Jeff Law <law at redhat dot com>, nathan at codesourcery dot com
Cc: gcc at gcc dot gnu dot org, Peter Maydell <peter dot maydell at linaro dot org>
Date: Mon, 13 Oct 2014 06:53:23 -0400
Subject: Re: [Consult] g++: About "-Wunused-variable" for constant variable initialized by function
Authentication-results: sourceware.org; auth=none
References: <543A910F dot 7060301 at gmail dot com>

On 10/12/2014 10:32 AM, Chen Gang wrote:

   [root@localhost qemu_cc]# cat test.cc
   const char n() { return 1; }
   const char c =  n();
   [root@localhost qemu_cc]# /usr/local/bin/g++ -Wall -O0 -c -o test.o test.cc
   [root@localhost qemu_cc]# /usr/local/bin/g++ -Wall -O2 -c -o test.o test.cc
   test.cc:2:12: warning: 'c' defined but not used [-Wunused-variable]
    const char c =  n();
               ^

The warning is correct (and new). Please submit bug reports via thewebsite; see https://gcc.gnu.org/bugs/


Jason

Follow-Ups:
- Re: [Consult] g++: About "-Wunused-variable" for constant variable initialized by function
  - From: Chen Gang

References:
- [Consult] g++: About "-Wunused-variable" for constant variable initialized by function
  - From: Chen Gang

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