how to rewrite the Makefile into android.mk?

问题

In my new project, I need to base on a c written project. And I know that I can use the NDK to do it, but here is a question: how to rewrite the standard Makefile into the Android.mk? And further more, in Android, can I, neglecting the ndk, build the project directly using the jni to adapt the c project into the android project? And anymore idea to adapt the c project into the android project? thx. At last, here is the Makefile:

# Makefile.in generated by automake 1.10.1 from Makefile.am.
# Makefile.  Generated from Makefile.in by configure.

# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
# 2003, 2004, 2005, 2006, 2007, 2008  Free Software Foundation, Inc.
# This Makefile.in is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.




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OTOOL64 = 
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subdirs2 = include lib util example
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mostlyclean-generic:

clean-generic:

distclean-generic:
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maintainer-clean-generic:
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clean-am: clean-generic clean-libtool mostlyclean-am

distclean: distclean-recursive
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dvi: dvi-recursive

dvi-am:

html: html-recursive

info: info-recursive

info-am:

install-data-am: install-pkgconfigDATA

install-dvi: install-dvi-recursive

install-exec-am:

install-html: install-html-recursive

install-info: install-info-recursive

install-man:

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install-ps: install-ps-recursive

installcheck-am:

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maintainer-clean-am: distclean-am maintainer-clean-generic

mostlyclean: mostlyclean-recursive

mostlyclean-am: mostlyclean-generic mostlyclean-libtool

pdf: pdf-recursive

pdf-am:

ps: ps-recursive

ps-am:

uninstall-am: uninstall-pkgconfigDATA

.MAKE: $(RECURSIVE_CLEAN_TARGETS) $(RECURSIVE_TARGETS) install-am \
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.PHONY: $(RECURSIVE_CLEAN_TARGETS) $(RECURSIVE_TARGETS) CTAGS GTAGS \
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$(pkgconfig_DATA): config.status
# Tell versions [3.59,3.63) of GNU make to not export all variables.
# Otherwise a system limit (for SysV at least) may be exceeded.
.NOEXPORT:

回答1:

You're going about the incorrect way. The Android.mk file is equivalent to the Makefile.ac in the autotools world. So start with the conversion of the Makefile.ac, rather than the Makefile itself.

However, the one issue you'll face is that there isn't any equivalent for the configure script in the NDK. This means that there is no automated method to create the config.h usually found in projects using autotools.

A quick and hacky solution is to run ./configure with appropriate options to generate a config.h that is correct, port the Makefile.am into Android.mk and then build with the NDK.

The options I use are using ndk r7c(I build against API_8 which is 2.2):

./configure \
--host=arm-linux-androideabi \
CC=arm-linux-androideabi-gcc \
LD=arm-linux-androideabi-ld \
CPPFLAGS="-I/home/sdk/ndk/platforms/android-8/arch-arm/usr/include/" \
CFLAGS="-nostdlib" \
LDFLAGS="-Wl,-rpath-link=/home/sdk/ndk/platforms/android-8/arch-arm/usr/lib/ -L/home/sdk/ndk/platforms/android-8/arch-arm/usr/lib/" \
LIBS="-lc"

An example of what I did (file(1) and libmagic) can be downloaded from http://forum.xda-developers.com/showthread.php?t=1612760

回答2:

Maybe you do not need to convert the Makefile or Makefile.ac into Android.mk. You can also use Android NDK tool chains independently as detailed in Android NDK documentation (${NDK_INSTALL_DIR}/doc/STANDALONE-TOOLCHAIN.html). You would need to specify -sysroot option for cross compile gcc when running ./configure, something like this perhaps:

./configure --host=xxx CC="xxx-gcc" \
CFLAGS="-sysroot ${NDK_INSTALL_DIR}/platforms/android-<level>/arch-<arch>/" \
CPPFLAGS="-sysroot ..." ...

You could make it even easier by building dedicated tool chain removing the need to provide -sysroot option (this also detailed in the above NDK documentation file).