Improved the Android build instructions

# shown. Now, from the external/curl/ directory, run curl's normal configure

# command with flags that match what Android itself uses. This will mean

# putting the compiler directory into the PATH, putting the -I, -isystem and

# -D options into CPPFLAGS, putting the -m, -f, -O and -nostdlib options into

# CFLAGS, and putting the -Wl, -L and -l options into LIBS, along with the path

# to the files libgcc.a, crtbegin_dynamic.o, and ccrtend_android.o. Remember

# that the paths must be absolute since you will not be running configure from

# the same directory as the Android make.  The normal cross-compiler options

# must also be set.

# -D options into CPPFLAGS, putting the -W, -m, -f, -O and -nostdlib options

# into CFLAGS, and putting the -Wl, -L and -l options into LIBS, along with the

# path to the files libgcc.a, crtbegin_dynamic.o, and ccrtend_android.o.

# Remember that the paths must be absolute since you will not be running

# configure from the same directory as the Android make.  The normal

# cross-compiler options must also be set. Note that the -c, -o, -MD and

# similar flags must not be set.

#

# To see all the LIBS options, you'll need to do the "showcommands" trick on an

# executable that's already buildable and watch what flags Android uses to link

# it (dhcpcd is a good choice to watch). You'll also want to add -L options to

# LIBS that point to the out/.../obj/lib/ and out/.../obj/system/lib/

# directories so that additional libraries can be found and used by curl.

#

# The end result will be a configure command that looks something like this

# (the environment variable A is set to the Android root path):

# (the environment variable A is set to the Android root path which makes the

# command shorter):

#

#  A=`realpath ../..` && \

#  PATH="$A/prebuilt/linux-x86/toolchain/arm-eabi-X/bin:$PATH" \

# into the right place (see the note about this below).

#

# Dan Fandrich

# May 2010

# July 2010

LOCAL_PATH:= $(call my-dir)

LOCAL_C_INCLUDES += $(LOCAL_PATH)/include $(LOCAL_PATH)/lib

# This will also need to include $(CURLX_ONES) in order to correctly link

# against a dynamic library

# if libcurl is changed to be a dynamic library

LOCAL_CFLAGS += $(common_CFLAGS)

include $(BUILD_EXECUTABLE)

   To clean the build results type 'make -f ./Makefile.vxworks clean'.

Android

=======

   See the build notes in the Android.mk file.

CROSS COMPILE

=============

   (This section was graciously brought to us by Jim Duey, with additions by

        - Alpha OpenVMS V7.1-1H2

        - Alpha Tru64 v5.0 5.1

        - AVR32 Linux

        - ARM Android 1.5

        - ARM Android 1.5, 2.1

        - ARM INTEGRITY

        - ARM iPhone OS

        - Cell Linux