defaulting to clang on FreeBSD 10.x

[rodent%NetBSD.org@localhost]

Hi,

This is pretty easy to reproduce. However you've bootstrapped pkgsrc on
FreeBSD 10.x, whether with a mk-fragment or not, you can comment the
PKGSRC_COMPILER, CC, CXX, CPP, and CLANGBASE variables in mk.conf and pkgsrc
will want to build gcc-3 on that system to build any other packages.

Attached is a patch which fixes this behaviour for FreeBSD >= 10. OK to commit
during the freeze?

Best regards,

rodent@

--- FreeBSD.mk.orig	2013-04-28 08:53:56.000000000 -0400
+++ FreeBSD.mk	2015-03-22 09:15:42.097219618 -0400
@@ -12,6 +12,14 @@
 SU?=		/usr/bin/su
 TYPE?=		type				# Shell builtin
 
+.if ${OS_VERSION} >= 10
+PKGSRC_COMPILER?=	clang
+CC?=			clang
+CXX?=			clang++
+CPP?=			${CC} -E
+CLANGBASE?=		/usr
+.endif
+
 CPP_PRECOMP_FLAGS?=	# unset
 DEF_UMASK?=		0022
 .if ${OBJECT_FMT} == "ELF"