Date: Fri, 7 Feb 2014 17:49:57 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: freebsd-stable@freebsd.org, freebsd-hackers@freebsd.org Subject: Why clang bundled with 10-RELEASE doesn't define __has_feature(cxx_nullptr)? Message-ID: <717736061.20140207174957@serebryakov.spb.ru>
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Hello, freebsd-stable.
Why __has_feature(cxx_nulptr) doesn't work on system compiler? nullptr
itself works!
Here is sample program:
============================= test.cxx
#include <memory>
#ifndef __has_feature
#warning "Doesn't support for __has_feature at all"
#define __has_feature(x) 0
#endif
#if __has_feature(cxx_nullptr)
#warning "Has nullptr"
#else
#warning "Doesn't have nullptr"
#endif
int main(int argn, char *argv[]) {
void *v = nullptr;
return 0;
}
======================================
> c++ --version
FreeBSD clang version 3.3 (tags/RELEASE_33/final 183502) 20130610
Target: x86_64-unknown-freebsd10.0
Thread model: posix
> c++ test.cxx
test.cxx:11:2: warning: "Doesn't have nullptr" [-W#warnings]
#warning "Doesn't have nullptr"
^
1 warning generated.
>
--
// Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
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