travis: Define a Windows build test using MinGW

.travis.yml

@@ -37,3 +37,5 @@ matrix:
   include:
     - compiler: gcc
       env: TEST=dist
+    - compiler: gcc
+      env: TEST=win MONOLITHIC=yes

scripts/test.sh

@@ -50,6 +50,22 @@ all)
 		  libnm-glib-dev libnm-glib-vpn-dev libpcsclite-dev libpam0g-dev
 		  binutils-dev libunwind7-dev libjson0-dev"
 	;;
+win)
+	CONFIG="--host=x86_64-w64-mingw32 --disable-defaults --enable-svc --enable-ikev2
+			--enable-ikev1 --enable-static --enable-test-vectors --enable-nonce
+			--enable-constraints --enable-revocation --enable-pem --enable-pkcs1
+			--enable-pkcs8 --enable-x509 --enable-pubkey --enable-acert
+			--enable-eap-tnc --enable-eap-ttls --enable-eap-identity
+			--enable-tnccs-20 --enable-imc-attestation --enable-imv-attestation
+			--enable-imc-os --enable-imv-os --enable-tnc-imv --enable-tnc-imc
+			--enable-pki --enable-swanctl"
+	# no make check for Windows binaries
+	TARGET=
+	CFLAGS="$CFLAGS -mno-ms-bitfields"
+	DEPS="gcc-mingw-w64-x86-64 binutils-mingw-w64-x86-64 gcc-mingw-w64-base
+		  mingw-w64-dev"
+	CC="x86_64-w64-mingw32-gcc"
+	;;
 dist)
 	TARGET=distcheck
 	;;
@@ -70,5 +86,5 @@ CONFIG="$CONFIG
 	--enable-monolithic=${MONOLITHIC-no}
 	--enable-leak-detective=${LEAK_DETECTIVE-no}"
 
-echo "$ ./configure $CONFIG && make $TARGET"
-CFLAGS="$CFLAGS" ./configure $CONFIG && make -j4 $TARGET
+echo "$ CC="$CC" CFLAGS="$CFLAGS" ./configure $CONFIG && make $TARGET"
+CC="$CC" CFLAGS="$CFLAGS" ./configure $CONFIG && make -j4 $TARGET