CMake find_package 與 GLEW

Question

我正在嘗試為使用 GLEW 的項目設置 CMakeLists.txt 文件。 我一直這樣做：

find_path(GLEW_INCLUDE_DIR GL/glew.h)  

find_library(GLEW_LIBRARY_RELEASE glew32)
find_library(GLEW_LIBRARY_DEBUG glew32d)

target_include_directories(${APP_NAME} PUBLIC ${GLEW_INCLUDE_DIR}) 

target_link_libraries(${APP_NAME} optimized ${GLEW_LIBRARY_RELEASE}
                                  debug ${GLEW_LIBRARY_DEBUG})

這種方法有效，但我想使用 find_package 方法，因為我認為它更好。

我在這個網站上找到了一些這樣的例子： 將 GLEW 添加到項目 (CMake)這建議做這樣的事情：

find_package(GLEW REQUIRED)
target_link_libraries(${APP_NAME} GLEW::GLEW)

但是當我嘗試這樣做時，它會在配置階段產生錯誤：

CMake Error at C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:16 (include):
include could not find load file:

C:/libs/glew-2.1.0/build/cmake/glew-targets.cmake
Call Stack (most recent call first):
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:64 (get_property):
get_property could not find TARGET GLEW::glew.  Perhaps it has not yet been
created.
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)


CMake Error at C:/libs/glew-2.1.0/build/cmake/CopyImportedTargetProperties.cmake:73 (get_target_property):
get_target_property() called with non-existent target "GLEW::glew".
Call Stack (most recent call first):
C:/libs/glew-2.1.0/build/cmake/glew-config.cmake:56 (copy_imported_target_properties)
C:/Program Files/CMake/share/cmake-3.15/Modules/FindGLEW.cmake:62 (find_package)
CMakeLists.txt:14 (find_package)

所以它看起來像是在 C:/libs/glew-2.1.0/build/cmake 中尋找 glew-targets.cmake 這是我在 CMake GUI 中設置的 GLEW_DIR 因為它有 glew-config.cmake 文件。

但是 glew-targets.cmake 文件實際上在 C:\\libs\\glew-2.1.0\\build\\cmake\\build\\CMakeFiles\\Export\\lib\\cmake\\glew 中，當我在 GLEW 上運行 CMake 時，它​​是在那里創建的。

為什么它找錯了地方？

我從http://glew.sourceforge.net/下載了 GLEW 作為 .ZIP 源。 然后我在它上面運行 CMake，同時指定 C:/libs/glew-2.1.0/build/cmake 作為源目錄和 C:/libs/glew-2.1.0/build/cmake/build 作為構建目錄。

那么我到底應該怎么做呢？

Answer 1

這種方法有效，但我想使用 find_package 方法，因為我認為它更好。

更好，因為您無法了解所有的需求才能使用。 find_package命令具有從受支持的庫（或支持 CMake 的庫）檢測需求的所有必要條件。

所以它看起來像是在 C:/libs/glew-2.1.0/build/cmake 中尋找 glew-targets.cmake 這是我在 CMake GUI 中設置的 GLEW_DIR 因為它有 glew-config.cmake 文件。

問題是 GLEW 不支持從它的構建樹導入。

要使其工作，只需在使用 CMake 構建 GLEW 時設置安裝前綴：

-DCMAKE_INSTALL_PREFIX=C:/libs/glew-2.1.0/build/cmake/install

然后，安裝庫。 它應該安裝在指定的目錄中。

然后，您應該將glew_DIR變量設置為該目錄：

set(glew_DIR "C:/libs/glew-2.1.0/build/cmake/install/lib/cmake/glew")

您也可以將前綴路徑設置為安裝目錄：

list(APPEND CMAKE_PREFIX_PATH "C:/libs/glew-2.1.0/build/cmake/install")

它找到了錯誤的文件，因為在它們的源目錄中，glew 有一個名為glew-config.cmake的文件（ IMO 應該在一個子文件夾中以避免出現這種情況）。

構建目錄還應包含配置文件。