The first option is the simplest but it's not desirable to have many copies of the libraryfloating around across the projects -- even under version control.
第一个选项是最简单的，但是不希望在项目周围出现许多库的副本——即使在版本控制下。
3
fdlibm: A C math library for machines that support IEEE 754 floating-point, is available from the Netlib mathematical software repository.
fdlibm ：一个适用于支持 IEEE 754 浮点数的机器的 C math 库，可在 Netlib 数学软件库中找到。