can now build Android targeted binary

Various things that don't work on Android are just ifdefed out.

* the webapp (needs template haskell for arm)
* --include and --exclude globbing (needs libpcre, which is not ported;
  probably I'll make it use the pure haskell glob library instead)
* annex.diskreserve checking (missing sys/statvfs.h)
* timestamp preservation support (yawn)
* S3
* WebDAV
* XMPP

The resulting 17mb binary has been tested on Android, and it is able to,
at least, print its usage message.

1 files changed, 23 insertions, 2 deletions

diff --git a/Makefile b/Makefile
index 83fa33d47..841f52150 100644
--- a/Makefile
+++ b/Makefile
@@ -14,6 +14,12 @@ sources=Build/SysConfig.hs Utility/Touch.hs Utility/Mounts.hs
 all=$(bins) $(mans) docs
 
 OS:=$(shell uname | sed 's/[-_].*//')
+ifeq ($(ANDROID),1)
+OPTFLAGS?=-DWITH_INOTIFY -DWITH_ANDROID
+clibs=Utility/libdiskfree.o Utility/libmounts.o
+CFLAGS:=-Wall -DWITH_ANDROID
+THREADFLAGS=-threaded
+else
 ifeq ($(OS),Linux)
 OPTFLAGS?=-DWITH_INOTIFY -DWITH_DBUS
 clibs=Utility/libdiskfree.o Utility/libmounts.o
@@ -41,6 +47,7 @@ clibs=Utility/libdiskfree.o Utility/libmounts.o Utility/libkqueue.o
 endif
 endif
 endif
+endif
 
 ALLFLAGS = $(BASEFLAGS) $(FEATURES) $(OPTFLAGS) $(THREADFLAGS)
 
@@ -51,7 +58,8 @@ ifdef PROFILE
 GHCFLAGS=-prof -auto-all -rtsopts -caf-all -fforce-recomp $(ALLFLAGS)
 endif
 
-GHCMAKE=ghc $(GHCFLAGS) --make
+GHC?=ghc
+GHCMAKE=$(GHC) $(GHCFLAGS) --make
 
 # Am I typing :make in vim? Do a fast build.
 ifdef VIM
@@ -113,7 +121,7 @@ test: $(sources) $(clibs)
 
 testcoverage:
 	rm -f test.tix test
-	ghc $(GHCFLAGS) -outputdir $(GIT_ANNEX_TMP_BUILD_DIR)/testcoverage --make -fhpc test
+	$(GHC) $(GHCFLAGS) -outputdir $(GIT_ANNEX_TMP_BUILD_DIR)/testcoverage --make -fhpc test
 	./test
 	@echo ""
 	@hpc report test --exclude=Main --exclude=QC
@@ -216,6 +224,19 @@ osxapp:
 	rm -f tmp/git-annex.dmg.bz2
 	bzip2 --fast tmp/git-annex.dmg
 
+# Cross compile for Android binary.
+# Uses https://github.com/neurocyte/ghc-android
+#
+# configure is run, probing the local system.
+# So the Android should have all the same stuff that configure probes for,
+# including the same version of git.
+android:
+	$(MAKE) Build/SysConfig.hs
+	GHC=$$HOME/.ghc-android-14-arm-linux-androideabi-4.7/bin/arm-unknown-linux-androideabi-ghc \
+	CC=$$HOME/.ghc-android-14-arm-linux-androideabi-4.7/bin/arm-linux-androideabi-gcc \
+	FEATURES="-DWITH_ANDROID -DWITH_ASSISTANT -DWITH_DNS" \
+	ANDROID=1 $(MAKE) fast
+
 # used by ./ghci
 getflags:
 	@echo $(ALLFLAGS) $(clibs)