Compile zlib, OpenSSL & cUrl for Android

Compile zlib, OpenSSL and cUrl for Android

Prerequisites

Make sure you have Android NDK installed.

You may also need to install autoconf and libtool toolchains as well as build essentials.

Download

If you do not want to compile them yourself, you can download pre-compiled static libraries from releases.

Checkout newer versions in git submodules to compile newer versions of the libraries. For example, to build:

• zlib v1.2.12

cd zlib
git fetch
git checkout tags/v1.2.12
cd ..

• OpenSSL 1_1_1q

cd openssl
git fetch
git checkout OpenSSL_1_1_1q
cd ..

• cUrl 7_85_0

cd curl
git fetch
git checkout curl-7_85_0
cd ..

Usage

git clone https://github.com/F3FFO/compile_zlib_openssl_curl_android.git
cd compile_zlib_openssl_curl_android
git submodule update --init --recursive

export NDK=<your_android_ndk_root_here> # e.g. $HOME/Library/Android/sdk/ndk/25.1.8937393
export HOST_TAG=<your_host_tag> # e.g. linux-x86_64, see https://developer.android.com/ndk/guides/other_build_systems#overview
export MIN_SDK_VERSION=23 # or any version you want, see https://apilevels.com/

chmod +x ./build.sh
./build.sh

All compiled libs are located in build/ directory.

Use NDK to link those libs, part of Android.mk example:

LOCAL_PATH := $(call my-dir)/..

CURL_COMMON_CFLAGS := \
	-Wpointer-arith -Wwrite-strings -Wunused -Winline \
	-Wnested-externs -Wmissing-declarations -Wmissing-prototypes -Wno-long-long \
	-Wfloat-equal -Wno-multichar -Wsign-compare -Wno-format-nonliteral \
	-Wendif-labels -Wstrict-prototypes -Wdeclaration-after-statement -Wno-system-headers \
	-DHAVE_CONFIG_H

include $(CLEAR_VARS)
LOCAL_MODULE := curl
LOCAL_MODULE_TAGS := optional
LOCAL_EXPORT_C_INCLUDES += $(LOCAL_PATH)/build/curl/$(TARGET_ARCH_ABI)/include/curl/
LOCAL_SRC_FILES := $(LOCAL_PATH)/build/curl/$(TARGET_ARCH_ABI)/lib/libcurl.a
LOCAL_CFLAGS += $(CURL_COMMON_CFLAGS)
include $(PREBUILT_STATIC_LIBRARY)

If you do not want to compile the binaries on your own, you can refer to this repository: https://github.com/Zackptg5/Cross-Compiled-Binaries-Android