https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119544
Bug ID: 119544
Summary: gcc does not figure out variable is unused when
incremented in while loop
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: peter0x44 at disroot dot org
Target Milestone: ---
the following code:
https://gcc.godbolt.org/z/n36orPTGE
extern char* str;
void foo(void)
{
int i = 0;
while (*str == ' ' || *str == '\t' || *str == '\n' || *str == '\r')
{
i++;
str++;
}
}
when compiled with gcc -Wall -Wextra -Wunused-variable does not report that i
is unused.
Clang does report this, however:
<source>:5:6: warning: variable 'i' set but not used
[-Wunused-but-set-variable]
5 | int i = 0;
| ^
