http://llvm.org/bugs/show_bug.cgi?id=17789
Bug ID: 17789
Summary: Incorrect code of variable arguments
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Clang 3.4 (based on LLVM 3.4svn) for i386 target miscompiles the following
code.
$ cat error.c
#include <stdarg.h>
struct triple_s { short a; short b; short c; };
void func(struct triple_s s, ... );
int main(void)
{
struct triple_s s = { 1, 1, 1 };
int x = 1;
func(s, x);
return 0;
}
void func(struct triple_s s, ... )
{
int x;
va_list ap;
va_start(ap, s);
x = va_arg(ap, int);
va_end(ap);
if( x != 1 ) { __builtin_abort(); }
}
$ clang error.c
$ ./a.out
Aborted (core dumped)
The value of x was 65556 instead of 1.
There was no problem with an x86_64 target (but fails with -m32 option).
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