build gpgv v1.4.18 from source, statically to get around PIE vs non-PIE

If an executable is built fully statically, with no dynamic linking at all,
then the same binary will work on both PIE systems (android-21 and above),
and systems where PIE does not work (older than android-16).

closes #2 #2

.gitignore

@@ -10,6 +10,7 @@ proguard-project.txt
 #
 assets/busybox
 assets/cdebootstrap.tar
+assets/gpgv
 external/cdebootstrap/cdebootstrap-static-0.*/
 external/cdebootstrap/cdebootstrap.tar
 external/debian-archive-keyring/debian-archive-keyring-201*/

external/Makefile

@@ -70,12 +70,13 @@ export TZ=UTC
 
 .PHONY: all assets clean distclean
 
-all: $(EXTERNAL_ROOT)/busybox/busybox
+all: $(EXTERNAL_ROOT)/busybox/busybox $(EXTERNAL_ROOT)/gnupg/g10/gpgv
 	make -C $(EXTERNAL_ROOT)/cdebootstrap
 
 assets: all
 	install $(EXTERNAL_ROOT)/busybox/busybox \
 		$(EXTERNAL_ROOT)/cdebootstrap/cdebootstrap.tar \
+		$(EXTERNAL_ROOT)/gnupg/g10/gpgv \
 		$(ASSETS)/
 
 
@@ -94,20 +95,54 @@ $(EXTERNAL_ROOT)/busybox/busybox: $(EXTERNAL_ROOT)/busybox/.config
 	echo "TIMESTAMP: $(TIMESTAMP)"
 	faketime -f $(TIMESTAMP) make -C $(EXTERNAL_ROOT)/busybox/
 
+
+$(EXTERNAL_ROOT)/gnupg/configure: $(EXTERNAL_ROOT)/gnupg/configure.ac
+	cd $(EXTERNAL_ROOT)/gnupg && \
+		./autogen.sh --force
+
+$(EXTERNAL_ROOT)/gnupg/Makefile: $(EXTERNAL_ROOT)/gnupg/configure
+	cd $(EXTERNAL_ROOT)/gnupg && \
+		SYSROOT=$(NDK_SYSROOT) \
+		AR="$(AR)" \
+		CC="$(CC)" \
+		LD="$(LD)" \
+		CFLAGS="$(ALL_CFLAGS)" \
+		LDFLAGS="$(ALL_LDFLAGS) -static" \
+			./configure \
+				--host=$(HOST) \
+				--disable-agent-support \
+				--disable-bzip2 \
+				--disable-card-support \
+				--disable-exec \
+				--disable-keyserver-helpers \
+				--disable-hkp \
+				--disable-ldap \
+				--disable-nls \
+				--disable-photo-viewers
+
+$(EXTERNAL_ROOT)/gnupg/g10/gpgv: $(EXTERNAL_ROOT)/gnupg/Makefile
+	make -C $(EXTERNAL_ROOT)/gnupg/cipher
+	make -C $(EXTERNAL_ROOT)/gnupg/mpi
+	make -C $(EXTERNAL_ROOT)/gnupg/util
+	make -C $(EXTERNAL_ROOT)/gnupg/zlib
+	make -C $(EXTERNAL_ROOT)/gnupg/g10
+	$(STRIP) $(EXTERNAL_ROOT)/gnupg/g10/gpgv
+
 # to re-download and verify that the .debs included in git match the official
 # Debian ones
 verify-debian-packages: clean
 	make -C $(EXTERNAL_ROOT)/debian-archive-keyring
 	-rm $(EXTERNAL_ROOT)/cdebootstrap/cdebootstrap-static*.deb
 	make -C $(EXTERNAL_ROOT)/cdebootstrap
 
-clean: 
+clean:
 	rm -f -- $(EXTERNAL_ROOT)/busybox/.config
 	rm -f -- $(EXTERNAL_ROOT)/busybox/busybox
 	-cd $(EXTERNAL_ROOT)/busybox/ && \
 		patch -N -R -p1 --reject-file=- < ../003-mount-umount-fsck-df.patch
 	make -C $(EXTERNAL_ROOT)/busybox/ clean
 	make -C $(EXTERNAL_ROOT)/cdebootstrap/ clean
+	make -C $(EXTERNAL_ROOT)/gnupg/ clean
 	make -C $(EXTERNAL_ROOT)/debian-archive-keyring/ clean
 
 distclean: clean