Mac上执行./eosio_build.sh，由于网络或Mac本身系统的问题，经常会出现两个问题
问题1： LLVM NOTFOUND
CMake Error at libraries/wasm-jit/Source/Runtime/CMakeLists.txt:26 (find_package):
Could not find a package configuration file provided by "LLVM" (requested
version 4.0) with any of the following names:
LLVMConfig.cmake
llvm-config.cmake
Add the installation prefix of "LLVM" to CMAKE_PREFIX_PATH or set
"LLVM_DIR" to a directory containing one of the above files. If "LLVM"
provides a separate development package or SDK, be sure it has been
installed.
这是
解决方法：查找路径，移除，重装
find /usr -name LLVMConfig.cmake -print 2>/dev/null
然后
brew remove --force llvm
rm -rf build/
git submodule update --init --recursive
export LLVM_DIR=/usr/local/Cellar/llvm\@4/4.0.1/lib/cmake
./eosio_build.sh
/dev/null ： 在类Unix系统中，/dev/null，是一个特殊的设备文件，它丢弃一切写入其中的数据（但报告写入操作成功），读取它则会立即得到一个End Of File。
- 开发过程中，经常会有把一部分个公共库分离出来，是整个项目具有复用性和模块化，这就是git submodule的由来
git submodule update --init --recursive的动作是确保submodule被更新下载，并把路径注册在本地(register path)出来
在eos中submodule有以下一些
位于contracts下：
contracts/libc++/upstream
contracts/musl/upstream位于externals下：
externals/binaryen
externals/magic_get位于libaries下：
libraries/appbase
libraries/chainbase
libraries/fc
libraries/softfloat
EOShenzhen在未来的文章会讲解这些库的原理
问题 2: Boost_INCLUDE_DIR not found
Make Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
/Users/mac/Desktop/mainnet/eos/libraries/appbase/Boost_INCLUDE_DIR
used as include directory in directory /Users/mac/Desktop/mainnet/eos/libraries/appbase
/Users/mac/Desktop/mainnet/eos/libraries/chainbase/Boost_INCLUDE_DIR
used as include directory in directory /Users/mac/Desktop/mainnet/eos/libraries/chainbase
/Users/mac/Desktop/mainnet/eos/libraries/fc/Boost_INCLUDE_DIR
used as include directory in directory /Users/mac/Desktop/mainnet/eos/libraries/fc
/Users/mac/Desktop/mainnet/eos/tools/Boost_INCLUDE_DIR
used as include directory in directory /Users/mac/Desktop/mainnet/eos/tools
Boost_INCLUDE_DIR (ADVANCED)
used as include directory in directory /Users/mac/Desktop/mainnet/eos/contracts/proxy
解决方法
解决思路和LLVM类似，即寻找到boost存储的路径，移除，并重装
find / -name boost
如果./eosio_build.sh在一次安装过程中由于网络或者系统的问题出现问题，可能会导致一系列的问题
history | grep boost
可以执行
brew remove --force boost
rm -rf /usr/local/Cellar/boost
rm -rf /usr/local/include/boost
将保存在Cellar和 include中的boost文件夹删除掉
成功信号
参考链接：
https://github.com/EOSIO/eos/issues/3786
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