Explicitly use native gcc to compile tools

Author: danielinux

tools/ed25519/Makefile

@@ -1,16 +1,24 @@
 # Settings
 #
+CC=gcc
+LD=gcc
+CROSS_COMPILE=
 WOLFBOOT_ROOT=../../
 BOOTUTIL_ROOT=$(WOLFBOOT_ROOT)/lib/bootutil
-CFLAGS:=-lwolfssl -DHAVE_ED25519 -DHAVE_ASN -DWOLFCRYPT_ONLY -DTFM_TIMING_RESISTANT -DNO_RSA -DECC_TIMING_RESISTANT -DWOLFSSL_DER_TO_PEM -I$(BOOTUTIL_ROOT)/include -I$(WOLFBOOT_ROOT)/include
+CFLAGS:=-lwolfssl -DHAVE_ED25519 -DHAVE_ASN -DWOLFCRYPT_ONLY -DTFM_TIMING_RESISTANT -DNO_RSA -DECC_TIMING_RESISTANT -DWOLFSSL_DER_TO_PEM -I$(WOLFBOOT_ROOT)/include
+LDFLAGS:=-lwolfssl
+LDFLAGS_EXTRA=
+EXTRA_LDFLAGS=
 
 all: ed25519_keygen ed25519_sign
 
 
 
-ed25519_keygen: ed25519_keygen.c
+ed25519_keygen: ed25519_keygen.o
+	gcc -o $@ $^ $(LDFLAGS)
 
-ed25519_sign: ed25519_sign.c
+ed25519_sign: ed25519_sign.o
+	gcc -o $@ $^ $(LDFLAGS)
 
 clean:
 	@rm -f ed25519_keygen ed25519_sign