[英]CMake claims finding OpenGL but can't find EGL and OpenGL::GL
尝试在 Ubuntu 上查找 OpenGL 时,CMake 给了我令人困惑的结果。
上下文是我需要在没有 X 显示的服务器/docker 上进行无头渲染。 我已经通过apt-get install libgl1-mesa-dev
和apt-get install libegl1-mesa-dev
。
这是我的 CMakeLists.txt 中的相关部分:
cmake_minimum_required (VERSION 3.5.1)
project (sandbox LANGUAGES CXX)
# add OpenGL
find_package(OpenGL REQUIRED COMPONENTS OpenGL EGL GLX)
include_directories(${OPENGL_INCLUDE_DIRS})
if(OPENGL_FOUND)
message("Found OpenGL in the current environment!")
else()
message("Error: No OpenGL found.")
endif()
message("OpenGL include dirs" )
message("${OPENGL_INCLUDE_DIR}")
message("EGL include dirs" )
message("${OPENGL_EGL_INCLUDE_DIRS}")
if (OpenGL_EGL_FOUND)
message("EGL Found!")
else()
message("EGL Not Found!")
endif()
add_executable (sandbox "hello_egl.cpp" "shader.cpp")
target_link_libraries(sandbox PRIVATE OpenGL::OpenGL OpenGL::EGL OpenGL::GLX)
#target_include_directories(sandbox PRIVATE "/usr/include/EGL")
#target_link_libraries(sandbox "/usr/local/lib/x86_64-linux-gnu/libEGL.so")
#target_link_libraries(sandbox "/usr/local/lib/libEGL.so")
set_target_properties(sandbox PROPERTIES CXX_STANDARD 11)
这是我从运行cmake..
得到的错误:
Found OpenGL in the current environment!
OpenGL include dirs
/usr/local/include
EGL include dirs
EGL Not Found!
-- Configuring done
CMake Error at CMakeLists.txt:44 (add_executable):
Target "sandbox" links to target "OpenGL::OpenGL" but the target was not
found. Perhaps a find_package() call is missing for an IMPORTED target, or
an ALIAS target is missing?
CMake Error at CMakeLists.txt:44 (add_executable):
Target "sandbox" links to target "OpenGL::EGL" but the target was not
found. Perhaps a find_package() call is missing for an IMPORTED target, or
an ALIAS target is missing?
CMake Error at CMakeLists.txt:44 (add_executable):
Target "sandbox" links to target "OpenGL::GLX" but the target was not
found. Perhaps a find_package() call is missing for an IMPORTED target, or
an ALIAS target is missing?
令人困惑的是CMake
将OPENGL_FOUND
设置为true
,但无法链接到目标OpenGL::OpenGL
?
另外,我在/usr/local/lib/x86_64-linux-gnu/
中有EGL
,但为什么 CMake 找不到它?
root@6442439c7090:/app/sandbox/build# ls /usr/local/lib/x86_64-linux-gnu/
libEGL.so libGL.so.1 libGLESv1_CM.so.1.2.0 libGLX.so libGLdispatch.so.0 libOpenGL.so.0.0.0
libEGL.so.1 libGL.so.1.7.0 libGLESv2.so libGLX.so.0 libGLdispatch.so.0.0.0 pkgconfig
libEGL.so.1.1.0 libGLESv1_CM.so libGLESv2.so.2 libGLX.so.0.0.0 libOpenGL.so
libGL.so libGLESv1_CM.so.1 libGLESv2.so.2.1.0 libGLdispatch.so libOpenGL.so.0
我坚持使用find_package
的原因是以前我手动链接到libEGL.so
但应用程序在运行时无法显示。 所以我怀疑我链接到了错误的库。
terminate called after throwing an instance of 'std::runtime_error'
what(): EGL error 0x300c at eglGetDisplay
Aborted (core dumped)
根据@Tsyvarev 的有用评论,这个 output 是由于 CMake 的错误版本造成的。
我忘了链接它,但我查看的FindOpenGL
文档适用于 3.18.1 版本,而我要求最低 CMake 版本为 3.5.1。
在 3.5.1 中,没有COMPONENTS
部分。 OPENGL_FOUND
也不检查EGL
。
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