那些遇到过的问题

使用 GLEW 进行 CMake find_package

Sti*_*ius 6 c++ glew cmake

我正在尝试为使用 GLEW 的项目设置一个 CMakeLists.txt 文件。我一直这样做：

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})
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这种方法有效，但我想使用 find_package 方法，因为我认为它更好。

我在这个网站上找到了一些示例，例如：Adding GLEW to project (CMake)，建议执行如下操作：

find_package(GLEW REQUIRED)
target_link_libraries(${APP_NAME} GLEW::GLEW)
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但是当我尝试这样做时，它在配置阶段会产生错误：

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)
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所以看起来它正在 C:/libs/glew-2.1.0/build/cmake 中寻找 glew-targets.cmake，这是我在 CMake GUI 中设置的 GLEW_DIR，因为它具有 glew-config.cmake 文件。

但 glew-targets.cmake 文件实际上位于 C:\libs\glew-2.1.0\build\cmake\build\CMakeFiles\Export\lib\cmake\glew 中，当我在 GLEW 上运行 CMake 时，它​​是在其中创建的。

为什么它看起来在错误的地方？

我从http://glew.sourceforge.net/下载了 GLEW 作为 .ZIP 源。然后，我在其上运行 CMake，同时指定 C:/libs/glew-2.1.0/build/cmake 作为源目录，并指定 C:/libs/glew-2.1.0/build/cmake/build 作为构建目录。

那么我到底应该怎么做呢？

Gui*_*cot 1

这种方法有效，但我想使用 find_package 方法，因为我认为它更好。

这样做更好，因为您无法知道使用时需要满足的所有要求。该find_package命令具有检测受支持的库（或支持 CMake 的库）的要求所需的所有功能。

所以看起来它正在 C:/libs/glew-2.1.0/build/cmake 中寻找 glew-targets.cmake，这是我在 CMake GUI 中设置的 GLEW_DIR，因为它具有 glew-config.cmake 文件。

问题是 GLEW 不支持从它的构建树导入。

要使其正常工作，只需在使用 CMake 构建 GLEW 时设置安装前缀即可：

-DCMAKE_INSTALL_PREFIX=C:/libs/glew-2.1.0/build/cmake/install
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然后，安装库。它应该安装在指定的目录中。

然后，您应该将glew_DIR变量设置为该目录：

set(glew_DIR "C:/libs/glew-2.1.0/build/cmake/install/lib/cmake/glew")
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您也可以将前缀路径设置为安装目录：

list(APPEND CMAKE_PREFIX_PATH "C:/libs/glew-2.1.0/build/cmake/install")
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它找到了错误的文件，因为在其源目录中，glew 有一个名为的文件glew-config.cmake（IMO 它应该位于子文件夹中以避免出现这样的情况）。

构建目录还应该包含配置文件。

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