musl - Re: [PATCH] Define NULL as __null in C++ mode when using GCC or Clang.

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Message-ID: <871ryycs9n.fsf@oldenburg2.str.redhat.com>
Date: Wed, 10 Jul 2019 08:34:12 +0200
From: Florian Weimer <fweimer@...hat.com>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] Define NULL as __null in C++ mode when using GCC or Clang.

* Szabolcs Nagy:

> it is clear that 0L is a conforming definition for all
> conforming c++ compilers.
>
> it is less clear if __null is so in all compilers that
> define __GNUC__.

Why wouldn't something like this be valid for current C++ versions?

static inline constexpr decltype(nullptr) __null{};
#define NULL __null

I don't see a requirement that NULL must be an expression that can be
evaluated by the preprocessor.

Thanks,
Florian

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