CMake查找模块以区分共享库还是静态库

问题描述

我有一个使用libCrypto ++的cmake c ++项目。我在托管了FindCryptoPP.cmake模块。重要部分包括：

I have a cmake c++ project that uses libCrypto++. I have FindCryptoPP.cmake module hosted here. Important parts are:

find_library(CryptoPP_LIBRARY
  NAMES cryptopp
  DOC "CryptoPP library"
  NO_PACKAGE_ROOT_PATH
  PATHS "/usr/lib/x86_64-linux-gnu/"
)
...
add_library(CryptoPP::CryptoPP UNKNOWN IMPORTED)
set_target_properties(CryptoPP::CryptoPP PROPERTIES
    IMPORTED_LOCATION "${CryptoPP_LIBRARY}"
    INTERFACE_INCLUDE_DIRECTORIES "${CryptoPP_INCLUDE_DIR}")

这很好用，找到静态库文件（* .a）。现在，我想创建单独的目标CryptoPP :: CryptoPP-static和CryptoPP :: CryptoPP-shared。
已安装必需的文件（默认为ubuntu安装）：

And this works fine, finds static library file (*.a). Now I would like to create separate targets CryptoPP::CryptoPP-static and CryptoPP::CryptoPP-shared.Necessary files are installed (default ubuntu install):

• /usr/lib/x86_64-linux-gnu/libcryptopp.a


• /usr/lib/x86_64-linux-gnu/libcryptopp.so

我想要知道如何告诉find_library搜索静态版本或共享版本（最好以可移植的方式-我需要所有Linux，Windows，MacOS）并指定创建的目标类型。

I want to know how to tell find_library to search either static or shared version (preferably in portable way - I need all of Linux, Windows, MacOS) and specify the type created target.

推荐答案

实际上CMake的默认设置是先搜索共享库，然后搜索静态库。

Actually CMake's default is to search first for shared libraries and then for static libraries.

关键是值的顺序作为CMake的命令执行以下操作：

The key is the order of values in the CMAKE_FIND_LIBRARY_SUFFIXES global variable, which is e.g. set in CMakeGenericSystem.cmake as part of CMake's compiler/platform detection of the project() command to:

set(CMAKE_FIND_LIBRARY_SUFFIXES ".so" ".a")

对于解决方案，请看看现有的查找模块，例如：

For a solution take a look at an existing find module like FindBoost.cmake:

# Support preference of static libs by adjusting CMAKE_FIND_LIBRARY_SUFFIXES
if( Boost_USE_STATIC_LIBS )
  set( _boost_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES})
  if(WIN32)
    list(INSERT CMAKE_FIND_LIBRARY_SUFFIXES 0 .lib .a)
  else()
    set(CMAKE_FIND_LIBRARY_SUFFIXES .a)
  endif()
endif()

这里 CMAKE_FIND_LIBRARY_SUFFIXES 变量已临时更改为调用。

Here the CMAKE_FIND_LIBRARY_SUFFIXES variable is temporarily changed for the find_library() calls.

此处同样适用。只需注意 find_library（）确实会缓存其结果，如果您想进行两次相同的搜索。

Same should be applicable here. Just be aware the find_library() does cache its results if you want to do the same search twice.

的默认值

• Default values for CMAKE_FIND_LIBRARY_PREFIXES/CMAKE_FIND_LIBRARY_SUFFIXES
• CMake find_library matching behavior?
• 'find_library' returns the same value in the loop in CMake

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