https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82839
Bug ID: 82839
Summary: missing -Wmaybe-uninitialized warning
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: arnd at linaro dot org
Target Milestone: ---
I stumbled across a bug in the linux kernel and was surprised that gcc had not
warned about it. I manually created a reduced version:
extern void h(int *t);
extern int g(void);
void f(int *t, int b)
{
int ts;
g();
*t = ts;
switch (b) {
case 0:
h(&ts);
};
}
gcc -Wall -O2 test.c -c
No gcc version I tried (gcc-3.4 through 8.0) warned about it in any
optimization level I tried. I also tried with clang, which did warn about it
correctly. I realize that there are many other open bugs about missing
-Wuninitialized warning and many duplicates, but I could not find any that are
like this one on a non-exhaustive search.
