https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108560
Bug ID: 108560
Summary: builtin_va_arg_pack_len is documented to return
size_t, but actually returns int
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jens.seifert at de dot ibm.com
Target Milestone: ---
#include <stdio.h>
bool test(const char *fmt, size_t numTokens, ...)
{
return __builtin_va_arg_pack_len() != numTokens;
}
Compiled with -Wsign-compare results in:
<source>: In function 'bool test(const char*, size_t, ...)':
<source>:5:40: warning: comparison of integer expressions of different
signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
5 | return __builtin_va_arg_pack_len() != numTokens;
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
<source>:5:37: error: invalid use of '__builtin_va_arg_pack_len ()'
5 | return __builtin_va_arg_pack_len() != numTokens;
| ~~~~~~~~~~~~~~~~~~~~~~~~~^~
Compiler returned: 1
Documentation:
https://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html
indicates a size_t return type
Built-in Function: size_t __builtin_va_arg_pack_len ()
