https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98630
Bug ID: 98630
Summary: Seg-fault when using a goto after condition (if)
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: k.even-mendoza at imperial dot ac.uk
Target Milestone: ---
The following code snippet:
unsigned b=0;
unsigned d=0;
static unsigned g = 1;
unsigned foo (unsigned ui1, unsigned ui2 ) { return (ui2 == 0) ? (ui1) : (ui1 %
ui2); }
unsigned j() {
{
unsigned *k = &b;
unsigned *m = &d;
unsigned **n = &m;
unsigned ***o = &n;
if (g)
;
else
p : {
if (foo(2, *k)) {
***o = 0;
return 2;
}
}
}
goto p;
}
int main() { j(); }
When compiling with GCC-10 (gcc-10 (Ubuntu 10.2.0-5ubuntu1~20.04) 10.2.0):
> gcc-10 -w -O2 r.c -pedantic -Wall -Wextra
> ./a.out
> Segmentation fault (core dumped)
The program in llvm, gcc-9, gcc-8, and gcc-7 exit without any output.
> clang-11 -w -O0 r.c -pedantic -Wall -Wextra -fsanitize=undefined
> ./a.out
>
or:
> clang-11 -w -O2 r.c -pedantic -Wall -Wextra
> ./a.out
>
or:
> gcc-9 -w -O2 r.c -pedantic -Wall -Wextra
> ./a.out
