https://bugs.llvm.org/show_bug.cgi?id=45121
Bug ID: 45121
Summary: Segmentation fault in simple function call using O1 ~
Os
Product: clang
Version: 6.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C
Assignee: unassignedclangb...@nondot.org
Reporter: haoxi...@gmail.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
Hi, the test.c
#include <stdio.h>
void foo( ) {
while(1){}
//do {}while(1); //crash
//for(;;); //crash
while(-1){} // non-executed loop, but still crash
}
int main () {
int size = 100;
printf("size = %d\n", size);
foo();
return 0;
}
is a simple function call code. When I compiler is using `clang-6.0 -O1 test.c`
(or O2, O3, and Os) and then `./a.out`, the output is
size=100
size=100
Segmentation fault(code dumped).
The strange thing is that `printf` function executed twice and whatever loop I
use in the function foo(), even a non-executed loop, it gets faults.
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