fix: configure target and setup important compilation flags for rust

app/Makefile

@@ -33,6 +33,11 @@ include $(CURDIR)/../deps/ledger-zxlib/makefiles/Makefile.app_testing
 # #{TODO} --> Need for an special mode?
 # DEFINES += REVIEW_SCREEN_ENABLED APP_BLIND_MODE_ENABLED
 
+ifeq ($(APP_TESTING),1)
+DEFINES += APP_TESTING
+DEFINES += ZEMU_LOGGING
+endif
+
 ifndef COIN
 COIN=TODO
 endif
@@ -71,19 +76,45 @@ $(error ICONNAME is not set)
 endif
 
 include $(CURDIR)/../deps/ledger-zxlib/makefiles/Makefile.platform
+include $(CURDIR)/../deps/ledger-zxlib/makefiles/Makefile.devices
+
+$(info TARGET_NAME  = [$(TARGET_NAME)])
+$(info ICONNAME  = [$(ICONNAME)])
+
+ifndef ICONNAME
+$(error ICONNAME is not set)
+endif
+
+ifeq ($(TARGET_NAME),TARGET_NANOS)
+RUST_TARGET:=thumbv6m-none-eabi
+endif
+
+ifeq ($(TARGET_NAME),TARGET_NANOX)
+RUST_TARGET:=thumbv6m-none-eabi
+endif
+
+ifeq ($(TARGET_NAME),TARGET_NANOS2)
+#RUST_TARGET:=thumbv8m.main-none-eabi
+RUST_TARGET:=thumbv6m-none-eabi
+endif
+
+ifeq ($(TARGET_NAME),TARGET_STAX)
+RUST_TARGET:=thumbv6m-none-eabi
+endif
+
+$(info ************ RUST_TARGET  = [$(RUST_TARGET)])
+
 CFLAGS += -Wvla
-# #{TODO} --> Need Rust?
-# LDFLAGS += -z muldefs
-# LDLIBS += -Lrust/target/thumbv6m-none-eabi/release -lrslib
-# APP_SOURCE_PATH += $(CURDIR)/rust/include
+LDFLAGS += -z muldefs
+LDLIBS   += -lm -lgcc -lc
+LDLIBS += -L$(MY_DIR)rust/target/$(RUST_TARGET)/release -lrslib
 
 APP_CUSTOM_LINK_DEPENDENCIES = rust
-LDLIBS += -Lrust/target/thumbv6m-none-eabi/release -lrslib
 APP_SOURCE_PATH += $(CURDIR)/rust/include
 
 .PHONY: rust
 rust:
-	cd rust && CARGO_HOME="$(CURDIR)/rust/.cargo" cargo build --target thumbv6m-none-eabi --release
+	cd rust && RUSTC_BOOTSTRAP=1 CARGO_HOME="$(CURDIR)/rust/.cargo" cargo build --target $(RUST_TARGET) --release
 
 # Before linking, we need to be sure rust lib is there
 bin/app.elf: rust