rustc: Add RUSTFLAGS environment variable option

Author: th0ma7

mk/spksrc.tc.mk

@@ -157,6 +157,7 @@ tc_vars: flag
 	echo TC_ENV += CARGO_BUILD_TARGET=\"$(RUST_TARGET)\" ; \
 	echo TC_ENV += CARGO_TARGET_$(shell echo $(RUST_TARGET) | tr - _ | tr a-z A-Z)_AR=\"$(WORK_DIR)/$(TC_TARGET)/bin/$(TC_PREFIX)ar\" ; \
 	echo TC_ENV += CARGO_TARGET_$(shell echo $(RUST_TARGET) | tr - _ | tr a-z A-Z)_LINKER=\"$(WORK_DIR)/$(TC_TARGET)/bin/$(TC_PREFIX)gcc\" ; \
+	echo TC_ENV += RUSTFLAGS=\"$(TC_RUSTFLAGS)\" ; \
 	echo TC_CONFIGURE_ARGS := --host=$(TC_TARGET) --build=i686-pc-linux ; \
 	echo TC_TYPE := $(TC_TYPE) ; \
 	echo TC_SYSROOT := $(WORK_DIR)/$(TC_TARGET)/$(TC_SYSROOT) ; \

toolchain/syno-qoriq-6.2.4/Makefile

@@ -9,5 +9,6 @@ TC_DIST_SITE_PATH = PowerPC%20QorIQ%20Linux%202.6.32
 TC_TARGET = powerpc-e500v2-linux-gnuspe
 TC_SYSROOT = $(TC_TARGET)/sysroot
 TC_EXTRA_CFLAGS = -mcpu=8548 -mhard-float -mfloat-gprs=double
+TC_RUSTFLAGS = -Ctarget-cpu=e500
 
 include ../../mk/spksrc.tc.mk