在github上面发现的一个很棒的脚本，非常值得学习的。我用的是最新的curl-7.48.0源码编译的，curl-7.48.0.tar

libcurl for iOS

Build libcurl for iOS development. This script will generate static library for armv7 armv7s arm64 i386 and x86_64. Bitcode support. OpenSSL and Darwin native ssl support.
Script only, please download libcurl from here: http://curl.haxx.se/download.htmlTested Xcode 7.2.1(7C1002) on OSX 10.11.3 Tested curl 7.44.0 and 7.47.1

Usage

curl -O http://curl.haxx.se/download/curl-7.47.1.tar.gz
tar xf curl-7.47.1.tar.gz
cd curl-7.47.1
curl https://raw.githubusercontent.com/sinofool/build-libcurl-ios/master/build_libcurl_dist.sh |bash

......
build_libcurl_dist.sh的内容如下：

#!/bin/bash
export DEVROOT=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
DFT_DIST_DIR=${HOME}/Desktop/libcurl-ios-dist
DIST_DIR=${DIST_DIR:-$DFT_DIST_DIR}
function check_curl_ver() {
echo "#include \"include/curl/curlver.h\"
#if LIBCURL_VERSION_MAJOR < 7 || LIBCURL_VERSION_MINOR < 40
#error Required curl 7.40.0+; See http://curl.haxx.se/docs/adv_20150108A.html
#endif"|gcc -c -o /dev/null -xc -||exit 9
}
function build_for_arch() {
  ARCH=$1
  HOST=$2
  SYSROOT=$3
  PREFIX=$4
  IPHONEOS_DEPLOYMENT_TARGET="6.0"
  export PATH="${DEVROOT}/usr/bin/:${PATH}"
  export CFLAGS="-arch ${ARCH} -pipe -Os -gdwarf-2 -isysroot ${SYSROOT} -miphoneos-version-min=${IPHONEOS_DEPLOYMENT_TARGET} -fembed-bitcode"
  export LDFLAGS="-arch ${ARCH} -isysroot ${SYSROOT}"
  ./configure --disable-shared --enable-static ${SSL_FLAG} --host="${HOST}" --prefix=${PREFIX} && make -j8 && make install
}
if [ "$1" == "openssl" ]
then
  if [ ! -d ${HOME}/Desktop/openssl-ios-dist ]
  then
    echo "Please use https://github.com/sinofool/build-openssl-ios/ to build OpenSSL for iOS first"
    exit 8
  fi
  export SSL_FLAG=--with-ssl=${HOME}/Desktop/openssl-ios-dist
else
  check_curl_ver
  export SSL_FLAG=--with-darwinssl
fi
TMP_DIR=/tmp/build_libcurl_$$
build_for_arch i386 i386-apple-darwin /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk ${TMP_DIR}/i386 || exit 1
build_for_arch x86_64 x86_64-apple-darwin /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk ${TMP_DIR}/x86_64 || exit 2
build_for_arch arm64 arm-apple-darwin /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk ${TMP_DIR}/arm64 || exit 3
build_for_arch armv7s armv7s-apple-darwin /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk ${TMP_DIR}/armv7s || exit 4
build_for_arch armv7 armv7-apple-darwin /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk ${TMP_DIR}/armv7 || exit 5
mkdir -p ${TMP_DIR}/lib/
${DEVROOT}/usr/bin/lipo \
	-arch i386 ${TMP_DIR}/i386/lib/libcurl.a \
	-arch x86_64 ${TMP_DIR}/x86_64/lib/libcurl.a \
	-arch armv7 ${TMP_DIR}/armv7/lib/libcurl.a \
	-arch armv7s ${TMP_DIR}/armv7s/lib/libcurl.a \
	-arch arm64 ${TMP_DIR}/arm64/lib/libcurl.a \
	-output ${TMP_DIR}/lib/libcurl.a -create
cp -r ${TMP_DIR}/armv7s/include ${TMP_DIR}/
curl -O https://raw.githubusercontent.com/sinofool/build-libcurl-ios/master/patch-include.patch
patch ${TMP_DIR}/include/curl/curlbuild.h < patch-include.patch
mkdir -p ${DIST_DIR}
cp -r ${TMP_DIR}/include ${TMP_DIR}/lib ${DIST_DIR}

build_libcurl_dist.sh下载地址:build_libcurl_dist.sh (该文件备用，防止上面curl失败)
桌面会生成一个目录libcurl-ios-dist，里面包含了我们需要头文件和.a静态库(该库是几个平台合并在一起的)
补充：创建OC工程使用libcurl.a的时候切记一点，必须要添加zlib库，不然会提示未定义的符号之类的错误。libz.dylib。 补充二：后续用在Swift工程中，报这个错误：ld: library not found for -lcurl，后来在Libary Search Paths添加桌面目录下面的lib目录即可。如我的：/Users/leehom/Desktop/libcurl-ios-dist/lib

测试代码:

void test_post(char* url,char* data) {
    CURL *curl;
    CURLcode res;
    curl = curl_easy_init();
    if (curl) {
        //www.baidu.com/#wd=java
        curl_easy_setopt(curl, CURLOPT_URL, url);
        curl_easy_setopt(curl, CURLOPT_POST, 1L);
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
        res = curl_easy_perform(curl);
        curl_easy_cleanup(curl);
    }
}
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    test_post("http://www.baidu.com", "wd=java");
}

 
详情请移步:xcode7.2引用libcurl库出现”_inflate”, referenced from:错误解决方法

OpenSSL

The script link with native ssl by default (--with-darwinssl). To use OpenSSL, use https://github.com/sinofool/build-openssl-ios/ to build OpenSSL for iOS first, in curl source directory run: curl https://raw.githubusercontent.com/sinofool/build-libcurl-ios/master/build_libcurl_dist.sh openssl |bash

Binary

You can find a prebuild binary (with OpenSSL) here: https://sinofool.net/dl/libcurl-ios-dist.tar.bz2
Double check the binary file before use: SHA1: 993c9bb75d798a886749e7801d5f54c494dbf6fb libcurl-ios-dist.tar.bz2
GnuPG: (My Key ID: 9BE18853) https://sinofool.net/dl/libcurl-ios-dist.tar.bz2.sig
附件:build-libcurl-ios-master
 
昨天升级iOS程序，顺便升级了依赖到的两个库，OpenSSL和cURL。 升级了版本，增加了新的iPhone5s的64位CPU的支持。
I have updated the dependency libraries of my iPhone app, OpenSSL and cURL. Added support of iPhone5s new 64bit arm64 CPU. Upgraded to latest version.

Approach

交叉编译这两个库的关键是两个参数：-isysroot和-miphoneos-version-min cURL是拼上不同的参数实现的，OpenSSL已经内建有iphoneos-cross支持，修改一些参数来支持arm64和模拟器。
The key of cross compiling are two parameters: -isysroot and -miphoneos-version-min cURL is configured using parameters. While OpenSSL has a build-in target called iphoneos-cross, I added 64 bit support based on it.

Code

这两个项目的代码提交在了GitHub,目前用iOS SDK7.1在MacOSX 10.8验证通过. Here are two projects on GitHub, tested on iOS SDK 7.1 and MacOSX 10.8 .https://github.com/sinofool/build-openssl-ioshttps://github.com/sinofool/build-libcurl-ios

Usage

这两个脚本不需要git clone再使用，下载好OpenSSL和cURL的源代码并解压缩，直接运行github上的脚本，就会编译好放在桌面上。 It is not necessary clone the code locally, download the sources from OpenSSL and cURL official website. Run following scripts, results will be on the desktop. 

curl -O http://www.openssl.org/source/openssl-1.0.1f.tar.gz 

tar xf openssl-1.0.1f.tar.gz 

cd openssl-1.0.1f 

curl https://raw.githubusercontent.com/sinofool/build-openssl-ios/master/build_openssl_dist.sh |bash
cURL也是一样：

curl -O http://curl.haxx.se/download/curl-7.35.0.tar.gz tar xf curl-7.35.0.tar.gz cd curl-7.35.0 

curl https://raw.githubusercontent.com/sinofool/build-libcurl-ios/master/build_libcurl_dist.sh

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