Date: Thu, 29 Jan 2015 19:43:38 -0800 (PST)
From: Don Lewis <truckman@FreeBSD.org>
To: ports@FreeBSD.org
Subject: testing the value of ${CXX} in ports Makefile
Message-ID: <201501300345.t0U3jHwb008745@gw.catspoiler.org>
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I need to test the value of ${CXX} in the Makefile for a port and am
getting unexpected results. Here is a simplified version of the
Makefile:
PORTNAME= junk
PORTVERSION= 0.0.0
CATEGORIES= devel
DISTFILES=
MAINTAINER= truckman@FreeBSD.org
COMMENT= junk
USE_GCC= 4.9+
.include <bsd.port.pre.mk>
post-patch:
echo CXX=${CXX}
.if ${CXX} == g++49
echo detected g++49
.else
echo did not detect g++49
.endif
.include <bsd.port.post.mk>
If I run "make patch", this is what I get:
# make patch
===> junk-0.0.0 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by junk-0.0.0 for building
===> Extracting for junk-0.0.0
===> Patching for junk-0.0.0
echo CXX=g++49
CXX=g++49
echo did not detect g++49
did not detect g++49
If I run "make -dA patch" and look at the debug output, I observe
bsd.gcc.mk getting processed after the .if is evaluated. When the .if
is processed, the value of ${CXX} is still c++. It sort of looks like
bsd.gcc.mk isn't getting included until bsd.port.post.mk and we are
relying on lazy expansion to get the correct value of ${CXX} for the
actions.
It sort of looks like I'll have to do something like:
post-patch:
[ ${CXX} = g++49 ] && echo detected g++49
but that just seems goofy.
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