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Date: Thu, 18 Jan 2018 13:26:55 +0100 (CET)
From: Gerald Pfeifer <gerald@pfeifer.com>
To: Jan Beich <jbeich@FreeBSD.org>
cc: Alexey Dokuchaev <danfe@FreeBSD.org>, ports-committers@freebsd.org, 
 svn-ports-all@freebsd.org, svn-ports-head@freebsd.org
Subject: Re: svn commit: r457632 - in head/lang/guile2: . files
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On Sun, 31 Dec 2017, Jan Beich wrote:
>> How about this:
>>
>>     #if defined(__clang__) || (__GNUC__ * 10 + __GNUC_MINOR__ >= 46)
>>     ... ?
> Looks OK. None of lang/gcc* ports have __GNUC_MINOR__ >= 10.

GCC itself consistently uses

  __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__

so this is what I'd go for (or omitting __GNUC_PATCH_LEVEL__, but
using a factor of 100, not 10).

This is also what the GCC documentation uses when describing these
macros in cpp.info.

Gerald