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From: Jan Beich <jbeich@vfemail.net>
To: Don Lewis <truckman@FreeBSD.org>
Subject: Re: testing the value of ${CXX} in ports Makefile
References: <201501300345.t0U3jHwb008745@gw.catspoiler.org>
Date: Sat, 31 Jan 2015 06:00:35 +0100
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Don Lewis <truckman@FreeBSD.org> writes:

> PORTNAME=	junk
> PORTVERSION=	0.0.0
> CATEGORIES=	devel
> DISTFILES=
>
> MAINTAINER=	truckman@FreeBSD.org
> COMMENT=	junk
>
> USE_GCC=	4.9+
>
> .include <bsd.port.pre.mk>
>
> post-patch:
> 	echo CXX=${CXX}
> .if ${CXX} == g++49

This idiom may lead to crashes. According to the wiki[1] mixing
libstdc++ and libc++ is only supported when both are linked against
libcxxrt. lang/gcc by default use libsupc++, so you'd have to add

  USES=   compiler:gcc-c++11-lib

to force the port use devel/libc++. Also, the following wouldn't work

  .if ${CHOSEN_COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} == 49

because COMPILER_VERSION or COMPILER_FEATURES are evaluated against
COMPILER_TYPE, not CHOSEN_COMPILER_TYPE.

[1] https://wiki.freebsd.org/NewC++Stack#Mixing_Libraries_using_Libc.2B-.2B-_and_Libstdc.2B-.2B-

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