v8: add arm cross build support (from pancake).

srcpkgs/v8/template

@@ -20,17 +20,49 @@ long_desc="
  
  This package contains v8 the utilities mksnapshot and the d8 shell."
 
-makedepends="which subversion python readline-devel"
+hostmakedepends="which subversion python"
+makedepends="readline-devel"
 
 do_build() {
+	# TODO: add support to crosscompile for other targets.
+	if [ "$CROSS_BUILD" ]; then
+		case "${XBPS_TARGET_MACHINE}" in
+		arm*)
+			# NOTE: hardfp can be problematic if not hf is supported on target cpu
+			sed -e "s/m32flag':.*/m32flag':'',/" -i build/common.gypi
+			LINK="${CXX}" make V=1 ${makejobs} arm.release \
+				hardfp=on library=shared console=readline \
+				disassembler=on snapshot=off \
+				CXX.host=${CXX} CXX.link=${CXX} LINK.target="${CXX}"
+			;;
+		*)	msg_error "$pkgver: cannot cross compile for ${XBPS_TARGET_MACHINE}.\n"
+			;;
+		esac
+	else
+		# native build
 		make ${makejobs} native library=shared console=readline \
 			disassembler=on liveobjectlist=on
+	fi
 }
 
 do_install() {
+	if [ "$CROSS_BUILD" ]; then
+		case "$XBPS_TARGET_MACHINE" in
+		arm*)
+			vinstall out/arm.release/d8 755 usr/bin
+			vinstall out/arm.release/lib.target/lib${pkgname}.so 755 usr/lib
+			;;
+		esac
+	else
+		# native build
 		vinstall out/native/d8 755 usr/bin
-	vinstall out/native/mksnapshot 755 usr/bin
 		vinstall out/native/lib.target/lib${pkgname}.so 755 usr/lib
+	fi
+	if [ -z "$CROSS_BUILD" ]; then
+		# mksnapshot only built in native builds.
+		vinstall out/native/mksnapshot 755 usr/bin
+	fi
+
    	vinstall include/${pkgname}-debug.h 644 usr/include
 	vinstall include/${pkgname}-preparser.h 644 usr/include
 	vinstall include/${pkgname}-profiler.h 644 usr/include