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C++ External Libraries Cheatsheet

Folly

Setup

Download

git clone https://github.com/facebook/folly.git

Install dependencies

On MacOS it uses homebrew, no need to use sudo (as the README suggests):

cd folly
./build/fbcode_builder/getdeps.py install-system-deps --recursive

Build

Create a directory inside your home, folly/. Run:

python3 ./build/fbcode_builder/getdeps.py --allow-system-packages build --install-dir /home/me/folly/ --scratch-path /tmp/folly

Setting paths

On MacOS, add to .bash_profile:

export CPLUS_INCLUDE_PATH=/home/me/folly/include:$CPLUS_INCLUDE_PATH
export LIBRARY_PATH=/home/me/folly/lib:$LIBRARY_PATH

Linking

During compilation:

g++ -std=c++17 main.cpp -lfolly

CMakeLists.txt:

set(HOME "/home/kunigami")

add_executable(binary main.cpp)
target_include_directories(binary PRIVATE ${HOME}/folly/include)

target_link_libraries(
        binary PRIVATE
        ${HOME}/folly/lib/libfolly.a
        ${HOME}/github/glog/glog-0.5.0/build/libglog.so
        /lib/x86_64-linux-gnu/libgflags.so
        /usr/lib/x86_64-linux-gnu/libdouble-conversion.so
        ${HOME}/github/fmt/build/libfmt.a
        /usr/lib/x86_64-linux-gnu/libboost_context.so
        /usr/lib/x86_64-linux-gnu/libevent.so
        /usr/lib/x86_64-linux-gnu/libunwind.so.8
)

Notes (as of 2025/04/27):

Ubuntu’s latest fmt is version 9, so I had to install from source (see Fmt)
Ubuntu’s latest glog is version 0.6, which wasn’t incompatible with Folly’s usage, which uses 0.5. To install:

# First, go to the desired directory (e.g. ~/github)

$ wget https://github.com/google/glog/archive/v0.5.0.tar.gz
$ tar -xzf v0.5.0.tar.gz
$ cd glog-0.5.0/
$ mkdir build
$ cmake ..
$ make
# Available in ~/github/glog-0.5.0/build/libglog.so

Fmt

# First, go to the desired directory, (e.g. ~/github).

$ git clone //https://github.com/fmtlib/fmt.git
$ mkdir build
$ cd build
$ cmake ..
$ make
# Available in ~/github/fmt/build/libfmt.so