Put noisy info into dedicated 'make info' target, with version and flag

info as well.

Makefile

@@ -11,11 +11,9 @@ LOCAL_TOOLPREFIX := $(GCC_PATH)/riscv-none-elf
 # TODO: Some wildcard condition to detect prefix
 TOOLPREFIX := $(LOCAL_TOOLPREFIX)
 # TOOLPREFIX := $(SYS_TOOLPREFIX)
-$(info Using toolchain: $(TOOLPREFIX))
 
 QEMU_PATH := toolchain/qemu/bin
 QEMU = $(QEMU_PATH)/qemu-system-riscv64
-$(info Using qemu: $(QEMU))
 
 CC = $(TOOLPREFIX)-gcc
 AS = $(TOOLPREFIX)-as
@@ -121,6 +119,18 @@ get_toolchain: $(TOOLCHAIN_DIR) $(GCC_TARPATH) $(QEMU_TARPATH)
 distclean: clean
 	rm -rf $(TOOLCHAIN_DIR)
 
+info:
+	@echo "Using qemu v$(QEMU_VER): $(QEMU)"
+	@echo "Using toolchain gcc v$(GCC_VER): $(TOOLPREFIX)"
+	@echo "CFLAGS:"
+	@for flag in $(CFLAGS); do \
+	    printf "  %s\n" "$$flag"; \
+	done
+	@echo "LDFLAGS:"
+	@for flag in $(LDFLAGS); do \
+	    printf "  %s\n" "$$flag"; \
+	done
+
 -include *.d
 
-.PHONY: all qemu
+.PHONY: all qemu info