Modified ed25519 makefile to make it possible to cross-compile for windows

Author: danielinux

tools/ed25519/Makefile

@@ -1,24 +1,37 @@
 # Settings
 #
-CC=gcc
-LD=gcc
 CROSS_COMPILE=
 WOLFBOOT_ROOT=../../
-BOOTUTIL_ROOT=$(WOLFBOOT_ROOT)/lib/bootutil
-CFLAGS:=-lwolfssl -DHAVE_ED25519 -DHAVE_ASN -DWOLFCRYPT_ONLY -DTFM_TIMING_RESISTANT -DNO_RSA -DECC_TIMING_RESISTANT -DWOLFSSL_DER_TO_PEM -I$(WOLFBOOT_ROOT)/include
+CFLAGS:=-lwolfssl -DHAVE_ED25519 -DHAVE_ASN -DWOLFCRYPT_ONLY -DTFM_TIMING_RESISTANT -DNO_RSA -DECC_TIMING_RESISTANT -DWOLFSSL_DER_TO_PEM -I$(WOLFBOOT_ROOT)/include -I$(WOLFBOOT_ROOT)/lib/wolfssl
 LDFLAGS:=-lwolfssl
 LDFLAGS_EXTRA=
 EXTRA_LDFLAGS=
+CC=$(CROSS_COMPILE)gcc
+LD=$(CROSS_COMPILE)gcc
 
-all: ed25519_keygen ed25519_sign
+EXT=
 
 
+all: binaries
+
+windows: binaries
+	mv ed25519_keygen ed25519_keygen.exe
+	mv ed25519_sign   ed25519_sign.exe
+
+windows:CROSS_COMPILE=x86_64-w64-mingw32-
+windows:EXT:=.exe
+windows:WIN_OBJS+=/usr/x86_64-w64-mingw32/lib/libwolfssl-17.dll
+windows:LDFLAGS=-Wl,-Bstatic,--whole-archive $(WIN_OBJS) -lgcc -Wl,--no-whole-archive
+windows: all
+
+
+binaries: ed25519_keygen$(EXT) ed25519_sign$(EXT)
 
 ed25519_keygen: ed25519_keygen.o
-	gcc -o $@ $^ $(LDFLAGS)
+	$(CC) -o $@ $^ $(LDFLAGS)
 
 ed25519_sign: ed25519_sign.o
-	gcc -o $@ $^ $(LDFLAGS)
+	$(CC) -o $@ $^ $(LDFLAGS)
 
 clean:
-	@rm -f ed25519_keygen ed25519_sign
+	@rm -f ed25519_keygen ed25519_sign *.o *.exe