build qemu-palcode using alpha cross-compiler (#913103)

debian/control-in

@@ -108,6 +108,9 @@ Build-Depends: debhelper (>= 11),
 ##--enable-xen-pci-passthrough todo
 Build-Depends-Indep:
  gcc-s390x-linux-gnu,
+# libc6.1-dev-alpha-cross isn't really needed but the code,
+# for whatever reason, #include's string.h which needs libc6.1-dev
+ gcc-alpha-linux-gnu, libc6.1-dev-alpha-cross,
 Build-Conflicts: oss4-dev
 Standards-Version: 3.9.8
 Homepage: http://www.qemu.org/

debian/qemu-system-data.install

@@ -5,3 +5,5 @@ pc-bios/qemu_logo_no_text.svg usr/share/qemu
 b/fw/*.bin usr/share/qemu
 # s390x firmware
 b/fw/s390*.img usr/share/qemu
+# alpha firmware
+b/qemu-palcode/palcode-clipper usr/share/qemu

debian/qemu-system-data.lintian-overrides

 qemu-system-data: arch-independent-package-contains-binary-or-object usr/share/qemu/s390-ccw.img
 qemu-system-data: arch-dependent-file-in-usr-share usr/share/qemu/s390-ccw.img
 qemu-system-data: shared-lib-without-dependency-information usr/share/qemu/s390-ccw.img
+qemu-system-data: arch-independent-package-contains-binary-or-object usr/share/qemu/palcode-clipper
+qemu-system-data: arch-dependent-file-in-usr-share usr/share/qemu/palcode-clipper
+qemu-system-data: statically-linked-binary usr/share/qemu/palcode-clipper
+

debian/rules

@@ -32,6 +32,7 @@ enable_linux_user = $(if $(filter qemu-user,${BUILD_PACKAGES}),enable,disable)
 FIRMWAREPATH = /usr/share/qemu:/usr/share/seabios:/usr/lib/ipxe/qemu
 
 S390X_CROSSPFX = s390x-linux-gnu-
+ALPHAEV67_CROSSPFX = alpha-linux-gnu-
 
 # we add another set of configure options from debian/control
 common_configure_opts = \
@@ -302,6 +303,11 @@ build-indep:
 # x86 optionrom
 	${MAKE} -f ${CURDIR}/debian/optionrom.mak -C ${CURDIR}/b/fw SRC_PATH=${CURDIR}
 
+# alpha firmware in roms/palcode-clipper
+	cp -al roms/qemu-palcode b/
+	${MAKE} -C ${CURDIR}/b/qemu-palcode CROSS=${ALPHAEV67_CROSSPFX}
+	${ALPHAEV67_CROSSPFX}strip b/qemu-palcode/palcode-clipper
+
 # s390x firmware in pc-bios/s390-ccw
 	${S390X_CROSSPFX}gcc -Wl,-pie -fPIE -nostdlib -o b/fw/s390-ccw.img \
 	  -ffreestanding -fno-delete-null-pointer-checks -msoft-float \