禁止链接器优化掉未引用的函数和数据
链接静态库时，对于没有引用的函数和数据会被删除掉，这种优化被称为transitive COMDAT elimination。
这可能引起未被引用的静态变量及其初始化代码没有执行的问题，可采用链接参数来避免这个问题。
gcc ld
--whole-archive Include all archive contents
--no-whole-archive Include only needed archive contents
llvm ld
-force_load path_to_archive
Loads all members of the specified static archive library.
Note: -all_load forces all members of all archives to be loaded.
This option allows you to target a specific archive.
msvc link
/OPT:{REF | NOREF}
/OPT:REF eliminates functions and data that are never referenced;
/OPT:NOREF keeps functions and data that are never referenced.
静态库依赖顺序
当动态库或可执行程序关联静态库时，一定要逆序传入静态库（被依赖的在后面）。
常见警告屏蔽
-Wno-unused-value
-Wno-unused-label
-Wno-unused-local-typedefs
-Wno-unused-variable
-Wno-reorder
-Wno-missing-braces
-Wno-shorten-64-to-32
-Wno-logical-op-parentheses
-Wno-sometimes-uninitialized
-Wno-incompatible-ms-struct