Compiling problems from XCode using the xcodeproj file as generated by qmake

Hi guys,

I need help from you. I used gmake -macx filename.pro command to generate the .xcodeproj file. After opening this file in Xcode and compiling the C++ sources files, I've got thousands of errors related to C/C++ standard code and Qt included headers.
I have the impression that the code is considered by xcode as C code not C++ since the errors are related to the string.h interpretation, the public class statement is not known, "using namespace" statements not known , etc.
If generating the Makefile and compiling the source code with make command from command line, everything works fine.
Could you please tell me what should I add to the pro file (preferably) or in XCode to get rid of those errors related to C/C++ standard code?
Please note that if creating a new project in XCode, there I have the possibility to specify the project type (i.e C++ standard application) and the code added there is compiled well.
I have the above mentioned problem only with the xcodeproj files generated with qmake.

Thanks in advance for your help!

I finally managed to fix the issue. It was caused by the PRECOMPILED_HEADER statement in the .pro file.
Have a good day!

I've never experienced this issue before. By the way, within the .pro file you can manually specify the C++ compiler you want to be used by Xcode by default, using the parameter QMAKE_CXX. Here a standard .pro file I use for most of my projects developed on Mac OS:

Code:

---

TEMPLATE = app
TARGET =
DEPENDPATH += .
 
# Compiler to be used
QMAKE_CXX = g++-4.2
 
# Application configuration
CONFIG += qt warn_off release x86_64 x86
 
# Application icon
ICON = icon.icns
 
# OpenGL and XML Qt Frameworks
QT += opengl
QT += xml
 
# MacOS/Linux
macx {
 
	# Libraries
	INCLUDEPATH += /usr/local/include/
	LIBS += /usr/local/lib/libnnfw.a
	#LIBS += -lIrrlicht
	LIBS += /usr/local/lib/libIrrlicht.a
 
	# Frameworks
	LIBS += -framework Carbon
	LIBS += -framework Cocoa
 
}
 
# Windows
win32 {
 
	# Libraries
	INCLUDEPATH += "C:\nnfw-1.1.5-src\include"
	INCLUDEPATH += "C:\irrlicht-1.7.1\include"
	LIBS += "C:\nnfw-1.1.5-src\lib\Release\nnfw.lib"
	LIBS += "C:\irrlicht-1.7.1\lib\Win32-visualstudio\Irrlicht.lib"
 
}
 
# Input files
SOURCES +=  main.cpp \
			simulatorEngine.cpp \
			team.cpp \
			mav.cpp \
			nn.cpp \
			target.cpp \
			irrlichtGUI.cpp \
			eventReceiver.cpp
 
HEADERS +=  simulatorEngine.h \
			team.h \
			mav.h \
			nn.h \
			target.h \
			simulationParameters.h \
			irrlichtGUI.h \
			eventReceiver.h

---

Thanks for your answer.
BTW, have you ever mixed cpp files with m files in the same .pro file?
I have such a case, and the xcodeproj file give an error about the "Qt Preprocessors" script (something related to "No rule to make target '../folder/myfile.h' ").

The error in xcodeproj looks like this:
c -D_DEBUG -DUNICODE ... -I/usr/llocal/Qt4.6/....

Make: c: No such file or directory

Does this mean something for you?

Thanks.

I found meanwhile that is a bug logged already on this issue at the Qt Team:
http://bugreports.qt.nokia.com/browse/QTBUG-7953

Have a good day!