Mangle the rules file, trying to get WASM build

debian/rules

@@ -1,18 +1,27 @@
 #!/usr/bin/make -f
 
-export DEB_BUILD_MAINT_OPTIONS = hardening=+all
-DPKG_EXPORT_BUILDFLAGS = 1
-include /usr/share/dpkg/default.mk
-include /usr/share/rustc/architecture.mk
-export DEB_HOST_RUST_TYPE
-export PATH:=/usr/share/cargo/bin:$(PATH)
-export CARGO=/usr/share/cargo/bin/cargo
+DH_VERBOSE = 1
+
+# export DEB_BUILD_MAINT_OPTIONS = hardening=+all
+# DPKG_EXPORT_BUILDFLAGS = 1
+
+# Remove because they're for normal builds, not "cross" builds, or what ever
+# WASM is considered to be. Sort-of a cross-compile, but it isn't self hosting,
+# so I'm not sure what to call it.
+# include /usr/share/dpkg/default.mk
+# include /usr/share/rustc/architecture.mk
+
+# finds package info and puts it in vars like DEB_VERSION_UPSTREAM
+include /usr/share/dpkg/pkg-info.mk
+export DEB_HOST_RUST_TYPE DEB_HOST_GNU_TYPE
+CARGO=/usr/share/cargo/bin/cargo
 export CARGO_HOME=$(CURDIR)/debian/cargo_home
-export CARGO_REGISTRY=$(CURDIR)/debian/cargo_registry
+CARGO_REGISTRY=$(CURDIR)/debian/cargo_registry
 export DEB_CARGO_CRATE=$(DEB_SOURCE)_$(DEB_VERSION_UPSTREAM)
+export CFLAGS CXXFLAGS CPPFLAGS LDFLAGS
 
 %:
-	dh $@ --buildsystem=cargo
+	dh $@
 
 execute_after_dh_auto_clean:
 	$(CARGO) clean
@@ -20,8 +29,14 @@ execute_after_dh_auto_clean:
 	rm -rf $(CARGO_REGISTRY)
 	rm -f debian/cargo-checksum.json
 
-execute_before_dh_auto_configure:
+override_dh_auto_configure:
 	$(CARGO) prepare-debian $(CARGO_REGISTRY) --link-from-system
-	rm -f Cargo.lock
 	touch debian/cargo-checksum.json
+	# patch cargo_home config to use lld with wasm, otherwise the build fails
+	echo "\n[target.wasm32-unknown-unknown]" >> debian/cargo_home/config.toml
+	cat debian/cargo_home/config.toml | sed "s/linker=[^']\+/linker=rust-lld/" | grep "^rustflags = " >> debian/cargo_home/config.toml
+	dh_auto_configure
 
+override_dh_auto_test:
+# No tests. Can't execute a WASM binary
+	echo "Skipping tests, can't run WASM files"