Allows building debian packages for ARM.

tools/linux_dist_support/debian/rules

Index: tools/linux_dist_support/debian/rules
===================================================================
--- tools/linux_dist_support/debian/rules	(revision 39257)
+++ tools/linux_dist_support/debian/rules	(working copy)
@@ -9,16 +9,26 @@
 PARALLEL_JOBS := 1
 endif
 
-DEB_HOST_ARCH_CPU := $(shell dpkg-architecture -qDEB_HOST_ARCH_CPU)
 ifeq (amd64,$(DEB_HOST_ARCH_CPU))
 BUILD_TYPE += ReleaseX64
+ARCH += x64
 else
 ifeq (i386,$(DEB_HOST_ARCH_CPU))
 BUILD_TYPE += ReleaseIA32
+ARCH += ia32
 else
-$(warning unsupported target arch $(DEB_HOST_ARCH_CPU) - continuing anyway)
+ifeq (arm,$(DEB_HOST_ARCH_CPU))
+ifeq ($(DEB_BUILD_ARCH_CPU),$(DEB_HOST_ARCH_CPU))
+BUILD_TYPE += ReleaseARM
+else
+BUILD_TYPE += ReleaseXARM
 endif
+ARCH += arm
+else
+$(error unsupported target arch '$(DEB_HOST_ARCH_CPU)')
 endif
+endif
+endif
 
 # Verbose?
 ifeq (1,$(DH_VERBOSE))
@@ -40,12 +50,18 @@
 	GYP_GENERATORS=make python dart/tools/gyp_dart.py all
 
 override_dh_auto_build:
-	make -C dart -j$(PARALLEL_JOBS) \
-		BUILDTYPE=$(BUILD_TYPE) $(BUILD_ARGS) create_sdk
+	cd dart; \
+	python tools/build.py -v -m release -a $(ARCH) $(TOOLCHAIN) create_sdk; \
+	cd ..
 
 # Building the Dart SDK will already strip all binaries.
 override_dh_strip:
 
+# This override allows us to ignore spurious missing library errors when
+# cross-compiling.
+override_dh_shlibdeps:
+	dh_shlibdeps --dpkg-shlibdeps-params=--ignore-missing-info
+
 override_dh_auto_install:
 	mkdir -p debian/tmp/out
 	cp -R dart/out/$(BUILD_TYPE)/dart-sdk debian/tmp/out