In particular the compiler give this error three times at the same row’s code…

/Users/TresMac/Developing Project/C++/CalcolatriceSensibile-build-desktop-Desktop_Qt_4_7_4_for_GCC__Qt_SDK__Debug/../CalcolatriceSensibile/mainTest.cpp:16: error: explicit instantiation of ‘std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]’ but no definition available

I found that tis problem come out when i use the operator << with cout on a std:.string variable.

For exemple this code give mi problems:

I have the same operator << problem. Does Anyone know how to solve it?

Yes!!

I had the same problem with the “explicit instantiation of ‘std:basic_ostream<..’”

I tried out the flags that Qt used to compile a simple main routine. Seems it works if you say -mmacosx-version-min=10.7
instead of -mmacosx-version-min=10.5

There are no sdks for 10.5 or 10.6 on Mountain Lion and XCode 4.4!

Hope that helped.

btw, the entries with

can be found in

.

cheers again…

Great! I just found that conf. It works now. Thanks a lot. :)

Perfect!! Now it works!!
Thanks a lot!

Changing the mkspec file to -mmacosx-version-min=10.5 worked for me.

This one was real obscure. Does anyone have reason why this would break std iostream functions? At first I thought it was change in the gcc version with Mountain Lion.

Also, this appears to only effect gcc. Clang doesn’t seem to have a problem with min-version is seto to 10.5

Did you guys file a bug report [bugreports.qt-project.org] ? This needs fixing in Qt.

This is nice, but on my MacBookPro with ML (and a brand new XCode) I still get an error like

11:09:29: Configuration unchanged, skipping qmake step.
11:09:29: Could not start process “make” -w
Error while building project ImportMML (target: Desktop)
When executing build step ‘Make’

What do you recommend ? Thanks ? jm

JMLA, In the latest xcode the command line tools aren’t installed by default. Look in Xcode->preferences->downloads. Select “Command Line Tools”. Once you do this you may need to re-open QtCreator. But if this is the problem I would have expected Qt to complain earlier about not finding the tool chain.

Thanks gosuperninja! It probably helps. Nevertheless the error code is now as below
(I turned back to one of the QT basic drawing examples, that has always been working!)
I am afraid I might be forced, to continue my work, to go for a while through Parallels… (:-(
(I have added on Qt Creator/Preferences…/Build & Run/Manual GCC with correct paths)

17:52:58: Running build steps for project basicdrawing…
17:52:58: Starting: “/usr/bin/make” clean -w
make: Entering directory `/Users/JML/QtSDK/Examples/4.7/painting/basicdrawing’
rm -f moc_renderarea.cpp moc_window.cpp
rm -f qrc_basicdrawing.cpp
rm -f main.o renderarea.o window.o moc_renderarea.o moc_window.o qrc_basicdrawing.o
rm -f *~ core *.core
make: Leaving directory `/Users/JML/QtSDK/Examples/4.7/painting/basicdrawing’
17:52:58: The process “/usr/bin/make” exited normally.
17:52:58: Running build steps for project ImportMML…
17:52:58: Starting: “/usr/bin/make” clean -w
make: Entering directory `/Users/JML/Desktop/Import_MML/ImportMML’
rm -f moc_mainwindow.cpp
rm -f ui_mainwindow.h
rm -f main.o mainwindow.o qtmmlwidget.o moc_mainwindow.o
rm -f *~ core *.core
make: Leaving directory `/Users/JML/Desktop/Import_MML/ImportMML’
17:52:58: The process “/usr/bin/make” exited normally.
17:52:58: Running build steps for project basicdrawing…
17:52:58: Configuration unchanged, skipping qmake step.
17:52:58: Starting: “/usr/bin/make” -w
make: Entering directory `/Users/JML/QtSDK/Examples/4.7/painting/basicdrawing’
g++-4.2 -c -pipe -g -gdwarf-2 -arch x86_64 -Xarch_x86_64 -mmacosx-version-min=10.7 -Wall -W -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I../../../../Desktop/Qt/4.8.1/gcc/mkspecs/macx-g++42 -I. -I../../../../Desktop/Qt/4.8.1/gcc/lib/QtCore.framework/Versions/4/Headers -I../../../../Desktop/Qt/4.8.1/gcc/include/QtCore -I../../../../Desktop/Qt/4.8.1/gcc/lib/QtGui.framework/Versions/4/Headers -I../../../../Desktop/Qt/4.8.1/gcc/include/QtGui -I../../../../Desktop/Qt/4.8.1/gcc/include -I. -F/Users/JML/QtSDK/Desktop/Qt/4.8.1/gcc/lib -o main.o main.cpp
make: g++-4.2: No such file or directory
make: *** [main.o] Error 1
make: Leaving directory `/Users/JML/QtSDK/Examples/4.7/painting/basicdrawing’
17:52:58: The process “/usr/bin/make” exited with code 2.
Error while building project basicdrawing (target: Desktop)
When executing build step ‘Make’

JMLA, That issue isn’t related to Mountain Lion. I had that one a bit ago. It has to do with QtCreator, there was a bug submitted about it. I’m using Qt Creator 4.5, it appears to be fixed. Maybe you’re using 4.4? In any case it’s a problem with the mkspec file that QtCreator picks, macx-g++42. It should be macx-g++. In the project settings override the spec and it should get past that issue. Hopefully thats your last problem :)

FYI, I created a bug for the mmacosx-version-min=10.5 issue, https://bugreports.qt-project.org/browse/QTBUG-26734

If you still want to compile and target 10.5 you need to install the 10.5 SDK. Alas it is not included with Xcode 4.4. It’s a bit hacky, but the following works…

Grab the xcode_3.2.6_and_ios_sdk_4.3.dmg from the developer.apple.com downloads area, and then:

Make sure to select the appropriate install directory (i.e. /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer). You can substitute ‘open MacOSX10.5.pkg’ for 10.5 support.

After installing the old SDK you’ll need to add some symlinks:

This worked for me. A similar hack can be used to get the 10.6 SDK, although you may want to grab that out of a later version of xCode… Best of luck!

Thanks and Enjoy,
Erik