Adjust cross-toolchain environment to the changes in the clang build

fabric.  Since we now also build and use LLVM's lld we can copy lld to
the proper directory akin to what we do with clang.  Build compiler-rt
early as it is needed for building libc.

"go for it" mpi@

Makefile.cross

@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile.cross,v 1.93 2017/03/21 10:41:33 patrick Exp $
+# $OpenBSD: Makefile.cross,v 1.94 2017/05/23 14:57:30 patrick Exp $
 
 cross-tools:	cross-includes cross-binutils cross-gcc cross-lib
 cross-distrib:	cross-tools cross-bin cross-share cross-sys cross-etc-root-var
@@ -82,6 +82,7 @@ CROSSGCC=	${CROSSDIR}/.gcc_done
 .for _arch in ${TARGET_ARCH}
 .if !empty(CLANG_ARCH:M${_arch})
 COMPILER_VERSION=clang
+BUILD_CLANG=yes
 .elif !empty(GCC3_ARCH:M${_arch})
 COMPILER_VERSION=gcc3
 .else
@@ -231,6 +232,7 @@ ${CROSSGCC}:		${CROSSBINUTILS}
 	    MACHINE_ARCH=${TARGET_ARCH} \
 	    ${MAKE} depend)
 	(cd ${.CURDIR}/gnu/usr.bin/clang; \
+	    CC=clang CXX=clang++ \
 	    MAKEOBJDIR=obj.${MACHINE}.${TARGET} \
 	    MACHINE_ARCH=${TARGET_ARCH} \
 	    ${MAKE} all)
@@ -241,9 +243,12 @@ ${CROSSGCC}:		${CROSSBINUTILS}
 	    ${MAKE} install)
 	mv ${CROSSDIR}/usr/bin/clang ${CROSSDIR}/usr/bin/${TARGET_CANON}-clang
 	mv ${CROSSDIR}/usr/bin/clang++ ${CROSSDIR}/usr/bin/${TARGET_CANON}-clang++
+	mv ${CROSSDIR}/usr/bin/ld ${CROSSDIR}/usr/bin/${TARGET_CANON}-ld
 	cp -f ${CROSSDIR}/usr/bin/${TARGET_CANON}-clang ${CROSSDIR}/usr/${TARGET_CANON}/bin/${TARGET_CANON}-clang
+	cp -f ${CROSSDIR}/usr/bin/${TARGET_CANON}-ld ${CROSSDIR}/usr/${TARGET_CANON}/bin/${TARGET_CANON}-ld
 	ln -sf ${TARGET_CANON}-cc ${CROSSDIR}/usr/${TARGET_CANON}/bin/cc
 	ln -sf ${TARGET_CANON}-c++ ${CROSSDIR}/usr/${TARGET_CANON}/bin/c++
+	ln -sf ${TARGET_CANON}-ld ${CROSSDIR}/usr/${TARGET_CANON}/bin/ld
 	echo "#!/bin/sh\n${CROSSDIR}/usr/${TARGET_CANON}/bin/${TARGET_CANON}-clang --sysroot ${CROSSDIR} \"$$""@\"" > ${CROSSDIR}/usr/${TARGET_CANON}/bin/${TARGET_CANON}-cc; \
 	chmod +x ${CROSSDIR}/usr/${TARGET_CANON}/bin/${TARGET_CANON}-cc;
 	echo "#!/bin/sh\n${CROSSDIR}/usr/${TARGET_CANON}/bin/${TARGET_CANON}-clang --driver-mode=g++ --sysroot ${CROSSDIR} \"$$""@\"" > ${CROSSDIR}/usr/${TARGET_CANON}/bin/${TARGET_CANON}-c++; \
@@ -325,7 +330,7 @@ cross-lib:	${CROSSGCC}
 	    BSDOBJDIR=${CROSSDIR}/usr/obj; \
 	export MACHINE MACHINE_ARCH MACHINE_CPU BSDOBJDIR; \
 	(cd ${.CURDIR}/lib; \
-	    for lib in csu libc; do \
+	    for lib in csu libcompiler_rt libc; do \
 	    (cd $$lib; \
 	        eval ${CROSSENV} MAKEOBJDIR=obj.${MACHINE}.${TARGET} \
 		    ${MAKE} depend all ;\