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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/105210] gcc/auto-profile.cc:391:11: warning: variable 'level'
 set but not used
Date: Sun, 10 Apr 2022 20:12:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105210

--- Comment #2 from David Binderman <dcb314 at hotmail dot com> ---
It seems that recent gcc trunk can't detect set-but-not-used in this code:

extern int g( int);

void f( int m)
{
        int n;

        n =3D 0;

        for (int i =3D 0; i < m; ++i)
        {
                if (g( i))
                {
                        ++n;
                }
        }
}

$ /home/dcb/gcc/results/bin/g++ -c -g -O2  -Wall -Wextra -pedantic apr10b.cc
$

Recent clang trunk can:

$ /home/dcb/llvm/results/bin/clang++ -c -g -O2  -Wall  apr10b.cc
apr10b.cc:8:6: warning: variable 'n' set but not used
[-Wunused-but-set-variable]
        int n;
            ^
1 warning generated.
$=