Help! opengles3 book sample code build failed, error LNK2019: unresolved external symbol

[JieX]

I have tried to build the sample code on Visual Studio 2008 with the guide in Chapter 16. I used PowerVR SDK 3.5 on windows 7. I have set EGL_LIBRARY & OPENGLE3_LIBRARY to right path: D:\Imagination\PowerVR_Graphics\PowerVR_SDK\SDK_3.5\Builds\Windows\x86_64\Lib\libEGL.lib & libGLESv2.lib. But when i built the Hello_Triangle sample code, i got the following errors. I have tried some ways to fix it but failed. Does anyone have the same problem? Please help me.

2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglDeleteShader@4 referenced in function _LoadShader 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglGetShaderInfoLog@16 referenced in function _LoadShader 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglGetShaderiv@12 referenced in function _LoadShader 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglCompileShader@4 referenced in function _LoadShader 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglShaderSource@16 referenced in function _LoadShader 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglCreateShader@4 referenced in function _LoadShader 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglClearColor@16 referenced in function _Init 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglDeleteProgram@4 referenced in function _Init 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglGetProgramInfoLog@16 referenced in function _Init 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglGetProgramiv@12 referenced in function _Init 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglLinkProgram@4 referenced in function _Init 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglAttachShader@8 referenced in function _Init 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglCreateProgram@0 referenced in function _Init 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglDrawArrays@12 referenced in function _Draw 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglEnableVertexAttribArray@4 referenced in function _Draw 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglVertexAttribPointer@24 referenced in function _Draw 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglUseProgram@4 referenced in function _Draw 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglClear@4 referenced in function _Draw 2>Hello_Triangle.obj : error LNK2019: unresolved external symbol impglViewport@16 referenced in function _Draw 2>Common.lib(esUtil.obj) : error LNK2019: unresolved external symbol impeglQueryString@8 referenced in function _GetContextRenderableType 2>Common.lib(esUtil.obj) : error LNK2019: unresolved external symbol impeglMakeCurrent@16 referenced in function _esCreateWindow 2>Common.lib(esUtil.obj) : error LNK2019: unresolved external symbol impeglCreateContext@16 referenced in function _esCreateWindow 2>Common.lib(esUtil.obj) : error LNK2019: unresolved external symbol impeglCreateWindowSurface@16 referenced in function _esCreateWindow 2>Common.lib(esUtil.obj) : error LNK2019: unresolved external symbol impeglChooseConfig@20 referenced in function _esCreateWindow 2>Common.lib(esUtil.obj) : error LNK2019: unresolved external symbol impeglInitialize@12 referenced in function _esCreateWindow 2>Common.lib(esUtil.obj) : error LNK2019: unresolved external symbol impeglGetDisplay@4 referenced in function _esCreateWindow 2>Common.lib(esUtil_win32.obj) : error LNK2019: unresolved external symbol impeglSwapBuffers@8 referenced in function _ESWindowProc@16

[danginsburg]

Is it possible you are doing a 32-bit build and not a 64-bit build? If that's the case, you would need to link against D:\Imagination\PowerVR_Graphics\PowerVR_SDK\SDK_3.5\Builds\Windows\x86_32\Lib\libEGL.lib & libGLESv2.lib. Either that, or make sure you pick the 32-bit generator in cmake rather than Win64.

I can't think of anything else offhand that would cause this. It works fine with VS 2013. I don't have VS 2008 installed at the moment, but I would have expected it to work.

[JieX]

Hi, Dan. Thank you for your advice. I have fix the link error on my 64bit windows 7 after i chose VS 64bit in cmake and set library to 64 bit path. But i got another error message "Unhandled exception at 0x00000000 in Hello_Triangle.exe: 0xC0000005: Access violation reading location 0x0000000000000000." The error message occured when call eglInitialize() in esCreateWindow(), does it mean the gl lib&dll have configured correctly as eglGetDisplay() didn't get a error beforce calling eglInitialize().

[JieX]

I think this is a PowerVR_SDK configuration issue, the 32bit project works well after i set Edit -> Preferences -> Context creation mode = Loose in PVRVFrameGUI.

[vikramdattu]

I am getting this runtime error on visual studio 2010. Please help.

[JieX]

You can try to put the missing dll into the same direction of the *.exe.