查找库所在目录FIND_LIBRARY
语法：
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| find_library (
<VAR>
name | NAMES name1 [name2 ...] [NAMES_PER_DIR]
[HINTS path1 [path2 ... ENV var]]
[PATHS path1 [path2 ... ENV var]]
[PATH_SUFFIXES suffix1 [suffix2 ...]]
[DOC "cache documentation string"]
[NO_DEFAULT_PATH]
[NO_CMAKE_ENVIRONMENT_PATH]
[NO_CMAKE_PATH]
[NO_SYSTEM_ENVIRONMENT_PATH]
[NO_CMAKE_SYSTEM_PATH]
[CMAKE_FIND_ROOT_PATH_BOTH |
ONLY_CMAKE_FIND_ROOT_PATH |
NO_CMAKE_FIND_ROOT_PATH]
)
|
例子如下：
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| FIND_LIBRARY(RUNTIME_LIB mylib /usr/lib /usr/local/lib NO_DEFAULT_PATH)
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cmake会在目录中查找，如果所有目录中都没有，值RUNTIME_LIB就会被赋为NO_DEFAULT_PATH
