http://llvm.org/bugs/show_bug.cgi?id=17739
Bug ID: 17739
Summary: Omitting return statement in non-void function causes
return instruction to be omitted
Product: clang
Version: 3.3
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The following code (must be compiled with clang++ -O1 to trigger)
#include <stdio.h>
int foo() { printf("bar"); }
int main() {
foo();
return 0;
}
Causes the terminal to spam with "bar" until the stack fills up and the program
segfaults, due to that no ret instruction after the call to printf is generated
This does generate a warning
Yes, this is sort of a duplicate of http://llvm.org/bugs/show_bug.cgi?id=16071
, but wontfix, really? At least upgrade the warning to an error if its gonna
crash everything in completely nonsensical ways
Also very much worthy of noting that from what I can see on the llvm-dis
output, printf is meant to be tail called (e.g jmp), which doesnt seem to
happen, but I'm not terribly experienced with that
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