Details
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Bug
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Resolution: Cannot Reproduce
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Not Evaluated
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None
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5.1.1
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None
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Arch Linux version 3.11.5-1-ARCH x86_64. Nvidia 325.15-10 proprietary drivers.
Qt 5.1.1-2 (x86 64bit) OpenGL Desktop build. gcc 4.8.1 (x86 64bit).
Description
Issue:
Including glx.h and qopengl.h in a project results in conflicting declarations. It also leads to a declaration conflict between glxext.h and qopengles2ext.h.
Compile errors:
Compile Output
g++ -c -pipe -g -Wall -W -D_REENTRANT -fPIE -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_OPENGL_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I/usr/lib/qt/mkspecs/linux-g++ -I../glxerror -I/usr/include/qt -I/usr/include/qt/QtOpenGL -I/usr/include/qt/QtWidgets -I/usr/include/qt/QtGui -I/usr/include/qt/QtCore -I. -I. -o main.o ../glxerror/main.cpp
In file included from /usr/include/GL/glx.h:32:0,
from ../glxerror/main.cpp:5:
/usr/include/GL/gl.h:162:17: error: conflicting declaration 'typedef double GLdouble'
typedef double GLdouble; /* double precision float */
^
In file included from ../glxerror/main.cpp:4:0:
/usr/include/qt/QtGui/qopengl.h:97:17: error: 'GLdouble' has a previous declaration as 'typedef GLfloat GLdouble'
typedef GLfloat GLdouble;
^
In file included from /usr/include/GL/gl.h:2085:0,
from /usr/include/GL/glx.h:32,
from ../glxerror/main.cpp:5:
/usr/include/GL/glext.h:2169:149: error: conflicting declaration 'typedef void (* GLDEBUGPROC)(GLenum, GLenum, GLuint, GLenum, GLsizei, const GLchar*, const void*)'
typedef void (APIENTRY *GLDEBUGPROC)(GLenum source,GLenum type,GLuint id,GLenum severity,GLsizei length,const GLchar *message,const void *userParam);
^
In file included from /usr/include/qt/QtGui/qopengl.h:92:0,
from ../glxerror/main.cpp:4:
/usr/include/qt/QtGui/qopengles2ext.h:192:28: error: 'GLDEBUGPROC' has a previous declaration as 'typedef void (* GLDEBUGPROC)(GLenum, GLenum, GLuint, GLenum, GLsizei, const GLchar*, GLvoid*)'
typedef void (GL_APIENTRYP GLDEBUGPROC)(GLenum source,GLenum type,GLuint id,GLenum severity,GLsizei length,const GLchar *message,GLvoid *userParam);
^
make: *** [main.o] Error 1
13:00:05: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project glxerror (kit: Qt 5)
When executing step 'Make'
Reproducing the error:
Depending on your system, the following code might reproduce the issue.
main.cpp
#include <QApplication> #include <qt/QtGui/qopengl.h> #include <GL/glx.h> int main(int argc, char *argv[]) { QApplication a(argc, argv); return a.exec(); }
Motivation:
glx.h is needed in order to create an OpenCL context with OpenGL interopability. Typically, this would look like:
clgl_interop.cpp
#ifdef Q_OS_LINUX
cl_context_properties properties[] = {
CL_GL_CONTEXT_KHR, (cl_context_properties) glXGetCurrentContext(),
CL_GLX_DISPLAY_KHR, (cl_context_properties) glXGetCurrentDisplay(),
CL_CONTEXT_PLATFORM, (cl_context_properties) main_device->getPlatformId(),
0};
#endif
If there are alternate calls for glXGetCurrentContext() and glXGetCurrentDisplay() within Qt, please let me know.