https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92666
Bug ID: 92666
Summary: bogus -Wunused-but-set-variable in gcov.c with
-Wno-restrict
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
Bootstrap with -Wno-restrict fails due to -Werror=unused-but-set-variable in
gcc/gcov.c:
/src/gcc/svn/gcc/gcov.c: In function ‘const char* format_count(gcov_type)’:
/src//gcc/svn/gcc/gcov.c:2328:9: warning: variable ‘r’ set but not used
[-Wunused-but-set-variable]
2328 | float r = 1.0f * count / divisor;
| ^
A small test case reduced from the file is as follows. This is not
reproducible with the C front-end:
$ cat t.c && gcc -O2 -S -Wall -Wextra -Wno-restrict -xc++ t.c
extern "C" int printf (const char*, ...);
void f (unsigned n)
{
int i = 0;
while (n >>= 1)
++i;
float r = 1.0f * i;
printf ("%f", r);
}
t.c: In function ‘void f(unsigned int)’:
t.c:8:9: warning: variable ‘r’ set but not used [-Wunused-but-set-variable]
8 | float r = 1.0f * i;
| ^
