https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86505
Bug ID: 86505
Summary: __builtin_va_arg_pack_len() computes the number of
arguments wrongly
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: rpirrera at aitek dot it
Target Milestone: ---
I have found another issue with __builtin_va_arg_pack_len() that happens when
the functions that uses __builtin_va_arg_pack() calls another function that
uses __builtin_va_arg_pack_len(), the argument len is miscalculated as you can
see in the attached example.
This was working in GCC version 4.4.7.
#include <stdio.h>
/*************** TESTBUILTIN BEGIN ****************/
static inline __attribute__(( __always_inline__)) int
funA(unsigned int param, ...)
{
return __builtin_va_arg_pack_len();
}
static inline __attribute__(( __always_inline__)) int
funB(unsigned int param, ...)
{
return funA(param, 2, 4, __builtin_va_arg_pack());
}
int
testBuiltin(void)
{
int rc = funB(0,1,2);
if (rc != 4) {
return 1;
}
return 0;
}
int
main(void)
{
int rc;
rc = testBuiltin();
if (rc == 1) {
printf("Test Failed!\n");
return rc;
}
printf("Test Succeeded!\n");
return rc;
}
Thank you!
