感谢先行

Libevent github地址
机型架构参考
感谢分享1
感谢分享2

步骤

• 找一个文件夹，进入到该文件夹
• touch build_libevent.sh
• 把感谢分享1中的README.md的内容复制到build_libevent.sh中，记得点个star，都用了别人的劳动成果了。
• 在新的bash里xcodebuild -showsdks 如下图
  
  截屏2022-01-20 上午11.17.06.png

然后修改 下述代码块中的前两行

###########################################################################
# Choose your libevent version and your currently-installed iOS SDK version:
#
VERSION="2.1.12-stable"     #Choose your libevent version
USERSDKVERSION="14.4"   #your currently-installed iOS SDK version in last shortcut
MINIOSVERSION="9.0"
VERIFYGPG=false

因为我的libevent是用在真机上的，模拟器不能用，所以我直接删除了模拟器相关的东西，这个的话，可以根据自己的需要进行裁剪

• 执行脚本 ./build_libevent.sh 正常如下

checking whether to build static libraries... yes
checking for library containing inet_ntoa... none required
checking for library containing socket... none required
checking for library containing inet_aton... none required
checking for library containing sendfile... none required
checking for WIN32... no
checking for MIDIPIX... no
checking for CYGWIN... no
checking zlib.h usability... yes
checking zlib.h presence... yes
checking for zlib.h... yes
checking for library containing inflateEnd... -lz
checking for special C compiler options needed for large files... no
checking for _FILE_OFFSET_BITS value needed for large files... no
checking for arm-apple-darwin-pkg-config... no
checking for pkg-config... no
checking for library containing SSL_new... no
checking for library containing SSL_new... no
checking openssl/ssl.h usability... no
checking openssl/ssl.h presence... no
checking for openssl/ssl.h... no
configure: error: openssl is a must but can not be found. You should add the directory containing `openssl.pc' to the `PKG_CONFIG_PATH' environment variable, or set `CFLAGS' and `LDFLAGS' directly for openssl, or use `--disable-openssl' to disable support for openssl encryption

使用

记得把dependencies目录下的include 文件夹加入你的工程，并在Build Settings -> Search Paths 加入这个引用。否则会报#include <event2/util.h> not found

截屏2022-01-21 下午2.18.38.png

如果遇到如下的命令行报错，就说明你的sdk版本不对，仔细检查xcodebuild -showsdks和你的脚本写的

➜  build-ios git:(master) ✗ ./build_libevent.sh
Using libevent-2.1.12-stable.tar.gz
Building without ccache
🔥
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for arm-apple-darwin-strip... no
checking for strip... strip
checking for a thread-safe mkdir -p... build-aux/install-sh -c -d
checking for gawk... no
checking for mawk... no
checking for nawk... no
checking for awk... awk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether make supports nested variables... (cached) yes
checking whether make supports the include directive... yes (GNU style)
checking for arm-apple-darwin-gcc... /usr/bin/gcc -arch armv7 -miphoneos-version-min=9.0
checking whether the C compiler works... no
configure: error: in `/Users/draven/Desktop/speedup/third-party/libevent/build-ios/build/src/libevent-2.1.12-stable':
configure: error: C compiler cannot create executables
See `config.log' for more details

至此，configure执行了，但是少了依赖项。

configure: error: openssl is a must but can not be found. You should add the directory containing `openssl.pc' to the `PKG_CONFIG_PATH' environment variable, or set `CFLAGS' and `LDFLAGS' directly for openssl, or use `--disable-openssl' to disable support for openssl encryption

最后贴上大佬的脚本

###########################################################################
# Choose your libevent version and your currently-installed iOS SDK version:
#
VERSION="2.1.8-stable"
USERSDKVERSION="10.3"
MINIOSVERSION="8.0"
VERIFYGPG=false

###########################################################################
#
# Don't change anything under this line!
#
###########################################################################

# No need to change this since xcode build will only compile in the
# necessary bits from the libraries we create
ARCHS="i386 x86_64 armv7 armv7s arm64"

DEVELOPER=`xcode-select -print-path`
#DEVELOPER="/Applications/Xcode.app/Contents/Developer"

# for continuous integration
# https://travis-ci.org/mtigas/iOS-OnionBrowser
if [ "$1" == "--noverify" ]; then
    VERIFYGPG=false
fi
if [ "$2" == "--travis" ]; then
    ARCHS="i386 x86_64"
fi

if [[ ! -z "$TRAVIS" && $TRAVIS ]]; then
    # Travis CI highest available version
    echo "==================== TRAVIS CI ===================="
    SDKVERSION="${USERSDKVERSION}"
else
    SDKVERSION="${USERSDKVERSION}"
fi

cd "`dirname \"$0\"`"
REPOROOT=$(pwd)

# Where we'll end up storing things in the end
OUTPUTDIR="${REPOROOT}/dependencies"
mkdir -p ${OUTPUTDIR}/include
mkdir -p ${OUTPUTDIR}/lib


BUILDDIR="${REPOROOT}/build"

# where we will keep our sources and build from.
SRCDIR="${BUILDDIR}/src"
mkdir -p $SRCDIR
# where we will store intermediary builds
INTERDIR="${BUILDDIR}/built"
mkdir -p $INTERDIR

########################################

cd $SRCDIR

# Exit the script if an error happens
set -e

if [ ! -e "${SRCDIR}/libevent-${VERSION}.tar.gz" ]; then
    echo "Downloading libevent-${VERSION}.tar.gz"
    curl -LO https://github.com/libevent/libevent/releases/download/release-${VERSION}/libevent-${VERSION}.tar.gz
fi
echo "Using libevent-${VERSION}.tar.gz"

# up to you to set up `gpg` and add keys to your keychain
# may have to import from link on http://www.wangafu.net/~nickm/ or http://www.citi.umich.edu/u/provos/
if $VERIFYGPG; then
    if [ ! -e "${SRCDIR}/libevent-${VERSION}.tar.gz.asc" ]; then
        curl -LO https://github.com/libevent/libevent/releases/download/release-${VERSION}/libevent-${VERSION}.tar.gz.asc
    fi
    echo "Using libevent-${VERSION}.tar.gz.asc"
    if out=$(gpg --status-fd 1 --verify "libevent-${VERSION}.tar.gz.asc" "libevent-${VERSION}.tar.gz" 2>/dev/null) &&
    echo "$out" | grep -qs "^\[GNUPG:\] VALIDSIG"; then
        echo "$out" | egrep "GOODSIG|VALIDSIG"
        echo "Verified GPG signature for source..."
    else
        echo "$out" >&2
        echo "COULD NOT VERIFY PACKAGE SIGNATURE..."
        exit 1
    fi
fi

tar zxf libevent-${VERSION}.tar.gz -C $SRCDIR
cd "${SRCDIR}/libevent-${VERSION}"

set +e # don't bail out of bash script if ccache doesn't exist
CCACHE=`which ccache`
if [ $? == "0" ]; then
    echo "Building with ccache: $CCACHE"
    CCACHE="${CCACHE} "
else
    echo "Building without ccache"
    CCACHE=""
fi
set -e # back to regular "bail out on error" mode

export ORIGINALPATH=$PATH

for ARCH in ${ARCHS}
do
    if [ "${ARCH}" == "i386" ] || [ "${ARCH}" == "x86_64" ];
    then
        PLATFORM="iPhoneSimulator"
        EXTRA_CONFIG="--host=${ARCH}-apple-darwin"
    else
        PLATFORM="iPhoneOS"
        EXTRA_CONFIG="--host=arm-apple-darwin"
    fi

    mkdir -p "${INTERDIR}/${PLATFORM}${SDKVERSION}-${ARCH}.sdk"

    export PATH="${DEVELOPER}/Toolchains/XcodeDefault.xctoolchain/usr/bin/:${DEVELOPER}/Platforms/${PLATFORM}.platform/Developer/usr/bin/:${DEVELOPER}/Toolchains/XcodeDefault.xctoolchain/usr/bin:${DEVELOPER}/usr/bin:${ORIGINALPATH}"
    export CC="${CCACHE}`which gcc` -arch ${ARCH} -miphoneos-version-min=${MINIOSVERSION}"

    ./configure --disable-shared --enable-static --disable-debug-mode ${EXTRA_CONFIG} --disable-clock-gettime \
    --prefix="${INTERDIR}/${PLATFORM}${SDKVERSION}-${ARCH}.sdk" \
    LDFLAGS="$LDFLAGS -L${OUTPUTDIR}/lib" \
    CFLAGS="$CFLAGS -Os -I${OUTPUTDIR}/include -isysroot ${DEVELOPER}/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDKVERSION}.sdk" \
    CPPFLAGS="$CPPFLAGS -I${OUTPUTDIR}/include -isysroot ${DEVELOPER}/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDKVERSION}.sdk"

    # Build the application and install it to the fake SDK intermediary dir
    # we have set up. Make sure to clean up afterward because we will re-use
    # this source tree to cross-compile other targets.
    make -j$(sysctl hw.ncpu | awk '{print $2}')
    make install
    make clean
done

########################################

echo "Build library..."

# These are the libs that comprise libevent. `libevent_openssl` and `libevent_pthreads`
# may not be compiled if those dependencies aren't available.
OUTPUT_LIBS="libevent.a libevent_core.a libevent_extra.a libevent_openssl.a libevent_pthreads.a"
for OUTPUT_LIB in ${OUTPUT_LIBS}; do
    INPUT_LIBS=""
    for ARCH in ${ARCHS}; do
        if [ "${ARCH}" == "i386" ] || [ "${ARCH}" == "x86_64" ];
        then
            PLATFORM="iPhoneSimulator"
        else
            PLATFORM="iPhoneOS"
        fi
        INPUT_ARCH_LIB="${INTERDIR}/${PLATFORM}${SDKVERSION}-${ARCH}.sdk/lib/${OUTPUT_LIB}"
        if [ -e $INPUT_ARCH_LIB ]; then
            INPUT_LIBS="${INPUT_LIBS} ${INPUT_ARCH_LIB}"
        fi
    done
    # Combine the three architectures into a universal library.
    if [ -n "$INPUT_LIBS"  ]; then
        lipo -create $INPUT_LIBS \
        -output "${OUTPUTDIR}/lib/${OUTPUT_LIB}"
    else
        echo "$OUTPUT_LIB does not exist, skipping (are the dependencies installed?)"
    fi
done

for ARCH in ${ARCHS}; do
    if [ "${ARCH}" == "i386" ] || [ "${ARCH}" == "x86_64" ];
    then
        PLATFORM="iPhoneSimulator"
    else
        PLATFORM="iPhoneOS"
    fi
    cp -R ${INTERDIR}/${PLATFORM}${SDKVERSION}-${ARCH}.sdk/include/* ${OUTPUTDIR}/include/
    if [ $? == "0" ]; then
        # We only need to copy the headers over once. (So break out of forloop
        # once we get first success.)
        break
    fi
done


####################

echo "Building done."
echo "Cleaning up..."
rm -fr ${INTERDIR}
rm -fr "${SRCDIR}/libevent-${VERSION}"
echo "Done."