Build Imgui with CMake get `unresolved external symbol` error | Together C & C++ | Page 1

pallid isle Oct 30, 2022, 3:31 AM

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when I build the project by cmake and vscode, it said __imp_glClearmain, __imp_glClearColormain, __imp_glViewportmain are unresolved external symbol
stackoverflow said it because it cant find opengl32.lib, but I did link the lib"""

this is my structure:

MesOpengl
├── include
│   └── glad
│       ├── glad.c
│       └── glad.h 
│   └── GLFW
│       ├── glfw3.h
│       └── glfw3native.h
│   └── KHR
│       └── glfw3native.h
│   └── imgui
│       ├── imgui.h
│       ├── imconfig.h
│       ├── imgui_impl_glfw.h
│       ├── imgui_impl_opengl3_loader.h
│       ├── imgui_impl_opengl3.h
│       ├── imgui_internal.h
│       ├── imstb_rectpack.h
│       ├── imstb_textedit.h
│       ├── imstb_truetype.h
│       ├── imgui_demo.cpp
│       ├── imgui_draw.cpp
│       ├── imgui_tables.cpp
│       ├── imgui_widgets.cpp
│       ├── imgui.cpp
│       ├── imgui_impl_opengl3.cpp
│       └── imgui_impl_glfw.cpp
├── lib
│   ├── glfw3.lib
│   ├── opengl32.lib
│   └── opengl32.dll
├── src
│   └── main.cpp
└── CMakeLists.txt

and this is my CMakeLists:

cmake_minimum_required(VERSION 3.8)
 
project(MesOpengl VERSION 0.1.0)
 
set(CMAKE_CXX_STANDARD 11)
 
set(THIRD_PARTY_H ${PROJECT_SOURCE_DIR}/include)
include_directories(${THIRD_PARTY_H})

set(LIB_PATH ${PROJECT_SOURCE_DIR}/lib)
file(GLOB_RECURSE LIB_FILES
    "${LIB_PATH}/*.lib"
)
link_directories(${LIB_PATH})

set(IMGUI_DIR ${THIRD_PARTY_H}/imgui)
add_library(IMGUI STATIC)

target_sources( IMGUI
                PUBLIC
                ${IMGUI_DIR}/imgui.h
                ${IMGUI_DIR}/imconfig.h
                ${IMGUI_DIR}/imgui_impl_glfw.h
                ${IMGUI_DIR}/imgui_impl_opengl3_loader.h
                ${IMGUI_DIR}/imgui_impl_opengl3.h
                ${IMGUI_DIR}/imgui_internal.h
                ${IMGUI_DIR}/imstb_rectpack.h
                ${IMGUI_DIR}/imstb_textedit.h
                ${IMGUI_DIR}/imstb_truetype.h

                PUBLIC
                ${IMGUI_DIR}/imgui_demo.cpp
                ${IMGUI_DIR}/imgui_draw.cpp
                ${IMGUI_DIR}/imgui_tables.cpp
                ${IMGUI_DIR}/imgui_widgets.cpp
                ${IMGUI_DIR}/imgui.cpp
                ${IMGUI_DIR}/imgui_impl_opengl3.cpp
                ${IMGUI_DIR}/imgui_impl_glfw.cpp
                )

target_include_directories( IMGUI
                            PUBLIC ${IMGUI_DIR}
                            PUBLIC ${THIRD_PARTY_H}
                            )

                            
target_link_libraries(IMGUI PUBLIC ${LIB_FILES})
target_link_libraries(IMGUI PUBLIC ${CMAKE_DL_LIBS})
target_link_libraries(IMGUI PUBLIC ${OPENGL_gl_LIBRARY})

aux_source_directory(./src DIR_SRCS)
add_executable(${CMAKE_PROJECT_NAME} ${DIR_SRCS})
target_link_libraries(${CMAKE_PROJECT_NAME} ${LIB_FILES})
target_link_libraries(${CMAKE_PROJECT_NAME} IMGUI)

simple lavaBOT Oct 30, 2022, 3:32 AM

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When your question is answered use !solved to mark the question as resolved.

Remember to ask specific questions, provide necessary details, and reduce your question to its simplest form. For tips on how to ask a good question run !howto ask.

simple lavaBOT Oct 30, 2022, 3:46 PM

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This question thread is being automatically closed. If your question is not answered feel free to bump the post or re-ask. Take a look at !howto ask for tips on improving your question.

boreal prism Oct 30, 2022, 4:14 PM

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Show the compile commands used in the build?

pallid isle Oct 30, 2022, 4:24 PM

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I use this command in vscode command line

mkdir build
cd build
cmake --build . -j4

pallid isle Oct 30, 2022, 4:26 PM

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boreal prism Show the compile commands used in the build?

or should I follow some process to make this?

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when I save the CMakeLists, vscode will do the configuration for me

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this is my screenshot of file structure

boreal prism Oct 30, 2022, 4:56 PM

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pallid isle or should I follow some process to make this?

That's fine, also pass -v in the build step to produce verbose output

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Then look at the libraries listed as -lfoo in the link stage.

pallid isle Oct 30, 2022, 5:00 PM

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did u mean this?

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I use cmake --build . -j4 -v

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the error said "unresolved external symbol"

boreal prism Oct 30, 2022, 5:21 PM

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Are you building glad.c as part of the project?

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If not, you'll have to.

pallid isle Oct 31, 2022, 6:53 AM

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I think yes, I set the include directories, and glad.c is included in the folder:

set(THIRD_PARTY_H ${PROJECT_SOURCE_DIR}/include)
include_directories(${THIRD_PARTY_H})

tawny aspen Oct 31, 2022, 7:40 PM

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get more verbose log from linker
https://learn.microsoft.com/en-us/cpp/build/reference/verbose-print-progress-messages?view=msvc-170

/VERBOSE (Print progress messages)

Learn more about: /VERBOSE (Print progress messages)

pallid isle Oct 31, 2022, 9:56 PM

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I solved it, the problem is my opengl32.lib is copy from x86 folder but I build it as x64, Im sorry

#

!solved

#Build Imgui with CMake get `unresolved external symbol` error