problems debugging CEGUI

[YaronCT]

Hi,

I'm sorry if this question isn't specific to CEGUI, but for some reason I'm unable to debug CEGUI code with gdb, and this is something I've not encountered before. For example, I put a breakpoint in CEGUI::OpenGL3ShaderManager::loadShader. When I hit that breakpoint, I get:

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Breakpoint 1, 0x00007ffff7bac3e0 in CEGUI::OpenGL3ShaderManager::loadShader(unsigned int, std::string, std::string)@plt ()
   from /usr/local/cegui-0.8.4/lib/libCEGUIOpenGLRenderer-0.so.2

However, there's no indication of the source file name, and I can't see the code itself. I've built CEGUI 0.8.4 with:

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cmake -DCMAKE_BUILD_TYPE="Debug" -DCMAKE_INSTALL_PREFIX="/usr/local/cegui-0.8.4" ../../src/cegui-0.8.4
make -j4
sudo make install

And I built my sample program that uses CEGUI with:

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export PKG_CONFIG_PATH=${PKG_CONFIG_PATH}${PKG_CONFIG_PATH+":"}/usr/local/cegui-0.8.4/lib/pkgconfig
c++ main.cpp -g -I/usr/include/GLFW `pkg-config --cflags --libs CEGUI-0-OPENGL3` -Wl,-rpath,/usr/local/cegui-0.8.4/lib -lglfw -lGLEW -lGL

I'm using Debian Linux 8.1 with GCC 4.9.2, GDB 7.7.1 and CMake 3.0.2.

[YaronCT]

I've done the same with Clang and its debugger (LLDB), and debugging works fine. Could it be a GDB bug?

[Ident]

It could be, I am not sure. I only use Visual Studio and I have encountered not a single issue at all, ever. Of course this does not mean much, there could still be something "wrong" and Visual Studio may just be being nice about it. Does your problem only occur inside the the OpenGL Renderers?

[YaronCT]

I don't know in general, but from a single attempt I've now made to debug a function not in the renderer, it works. What's weird though is that when I get a crash in the OpenGL 3 renderer while in GDB, I can see its code. That also seems to suggests it's a GDB bug. I might ask in the GDB mailing list and see what they have to say. In the meantime I switched to LLVM's Clang/LLDB.

I find the combination of words "bug in GDB" somewhat funny and terrifying. It's like when the judge is a murderer himself...

[Ident]

Indeed, this is odd. If you figure out what causes this or if we did anything wrong, please report back.