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Date: Tue, 3 Jan 2017 13:29:08 -0500
From: Rich Felker <>
Subject: Re: libstdc++ namespace pollution

On Tue, Jan 03, 2017 at 05:44:47PM +0000, Justin Cormack wrote:
> I have been trying to build a C++ program recently, and came across
> the issue that
> 1. libstdc++ always defines _GNU_SOURCE see
> 2. Musl defines pretty much everything once _GNU_SOURCE is defined

So does glibc. :)

> In this case the issue was that the program included <signal.h> and
> then the register names REG_RIP etc were #defined as numeric
> constants, while the program wanted to use them as names for an enum.
> Does anyone have any recommendations (wondering about trying clang
> libc++ perhaps)?

This is a known issue that the gcc people want to fix, I think. It
might be possible to patch it out already it you're prepared to track
down things that break and fix them.


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