[C++][cmakelists]C++编译报错fmt未定义的引用解决方法

这个报错一般都是fmt的cmakelists没写好。首先要把fmt安装好：

git clone https://github.com/fmtlib/fmt.git
cd fmt
mkdir build
cd build
cmake ..
make -j8
sudo make install

然后再cmakelists补上fmt的include和lib

find_package(FMT REQUIRED)
target_link_libraries(xxx  fmt::fmt)