http://llvm.org/bugs/show_bug.cgi?id=20356
Bug ID: 20356
Summary: -pedantic turns on -Wformat-non-iso even though
positional arguments are part of POSIX.1 2008
Product: clang
Version: 3.2
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Compile the following example program with -std=c99 -pedantic:
#define _POSIX_C_SOURCE 200809L
#include <stdio.h>
extern int
main(void)
{
printf("%2$*1$d\n", 10, 4223);
return (0);
}
clang will warn that positional arguments are not in ISO C. Although
technically correct, this warning is not useful as positional arguments are
part of POSIX.1 2008, compliancy with which I explicitly request using a
feature test macro. This renders the -pedantic flag much less useful to develop
(POSIX) portable applications as it generates warnings about features that are
available on conforming platforms.
It might make sense to define an extra warning flag -pedantic=posix which is
pedantic about stuff that is neither in ISO C nor POSIX.
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