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在 Ubuntu 上安装 Facebook 的 C++ 库 Folly
source link: https://zhiqiang.org/coding/folly-install-on-ubuntu.html
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在 Ubuntu 上安装 Facebook 的 C++ 库 Folly
Folly 官方地址：https://github.com/facebook/folly。
folly 依赖格式化库fmt，需手工安装：
cd ~/3rd; git clone https://github.com/fmtlib/fmt.git && cd fmt mkdir _build && cd _build cmake .. -DCMAKE_INSTALL_PREFIX=/opt/ -DCMAKE_POSITION_INDEPENDENT_CODE=TRUE make -j$(nproc) sudo make install
下面脚本下载库文件到~/3rd，编译安装到/opt/include和/opt/lib。
cd ~/3rd; sudo apt-get install g++ cmake libevent-dev libdouble-conversion-dev libgoogle-glog-dev libgflags-dev libiberty-dev liblz4-dev liblzma-dev libsnappy-dev make zlib1g-dev binutils-dev libjemalloc-dev libssl-dev pkg-config libunwind-dev unzip -y wget https://github.com/facebook/folly/archive/master.zip -O folly.zip unzip folly.zip cd folly-master mkdir _build && cd _build cmake .. "-DCMAKE_INCLUDE_PATH=/opt/include" "-DCMAKE_LIBRARY_PATH=/opt/lib" -DCMAKE_INSTALL_PREFIX=/opt/ -DFOLLY_SUPPORT_SHARED_LIBRARY=ON -DCMAKE_POSITION_INDEPENDENT_CODE=ON make -j make install # /opt
folly编译后只有一个libfolly.a库文件，该文件不能用于构建SO文件，会报类似于下面的错误：
/usr/bin/ld: /opt/lib/libfolly.a(F14Table.cpp.o): relocation R_X86_64_TPOFF32 against `_ZZN5folly3f146detail21tlsPendingSafeInsertsElE5value' can not be used when making a shared object; recompile with -fPIC /usr/bin/ld: /opt/lib/libfolly.a(dynamic.cpp.o): relocation R_X86_64_PC32 against symbol `_ZN5folly7dynamic8typeNameENS0_4TypeE' can not be used when making a shared object; recompile with -fPIC
下面方法可支持构建SO文件：
cmake .. -DBUILD_SHARED_LIBS=ON -DCMAKE_POSITION_INDEPENDENT_CODE=ON
其它还可能碰到的错误为：
/usr/bin/ld: warning: libaio.so.1, needed by /opt/lib/libfolly.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libunwind.so.1, needed by /opt/lib/libfolly.so, not found (try using -rpath or -rpath-link) /opt/lib/libfolly.so: undefined reference to `io_getevents@LIBAIO_0.4' /opt/lib/libfolly.so: undefined reference to `io_queue_init@LIBAIO_0.1' /opt/lib/libfolly.so: undefined reference to `io_submit@LIBAIO_0.1' /opt/lib/libfolly.so: undefined reference to `io_queue_release@LIBAIO_0.1'
本质原因是libfolly.so找不到libaio.so和libunwind.so库文件。这可以用命令ldd /your_path/libfolly.so看出来。可以从其它机器将这两个文件复制过来，位置位于：
/lib/x86_64-linux-gnu/libaio.so.1.0.1/lib/x86_64-linux-gnu/libaio.so.1（只是上面文件的软链接）/usr/local/lib/libunwind.so.1
注意: ubuntu 20.04 unwind 版本为 libunwind.so.8
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