On 10/13/14 21:18, Chen Gang wrote:
> On 10/13/14 18:53, Jason Merrill wrote:
>> 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 the
>> website; see https://gcc.gnu.org/bugs/
>>
Thank Jason Merrill, again. At present, I have got enough confirmation
from you and other members (excuse me, I am not quite familiar with C++,
for me, it is a complex language, so need several members confirmation).
And if no additional reply within this week, I shall submit bug reports,
and try to fix it within this month (although I am really not quite
sure).
I am not quite familiar with C++, so if any members worry about me: feel
that I am not quite suitable to report bug and fix it, please let me
know within this week.
Thanks.
>
> OK, thanks. After finish this consult, I shall report bugs, and shall
> try to fix it (I got it from Qemu which in my current focus border).
> Hope I can finish within this month.
>
> And one another consult: if the constant variable is defined in header
> file, and never be used, need our g++ still report warning about
> [-Wunused-variable] too (for me, I guess, not)?
>
>
> Thanks.
>
--
Chen Gang
Open, share, and attitude like air, water, and life which God blessed
