On X86-64, the following code demonstrates how passing a long double as a fixed
argument causes corruption of the following variable arguments.
#include <stdio.h>
#include <assert.h>
#include <stdarg.h>
void test(int a, int b, int c, int d, int e, int f, int g, long double h, ...)
{
int i;
va_list ap;
va_start(ap, h);
i = va_arg(ap, int);
printf("Got %d, expected %d\n", i, 123456789);
va_end(ap);
}
int main() {
test(0, 0, 0, 0, 0, 0, 0, (long double)0.0, (int)123456789);
return 0;
}
--
Summary: Bug in argument passing of long double
Product: gcc
Version: 4.4.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pdox at alum dot mit dot edu
GCC build triplet: x86_64-linux-gnu
GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44942
