I'm going crazy because of Mac OSX and Qt!

[mrdebug]

Xcode 9.2, 9C40b
Latest Command line tools.

After having update Xcode and the command line tools at the latest version, after having uninstall and reinstall Qt framwerork, I have the same problem.
Lazarus / Freepascal is working without any problem.

Please have a look at the attached image.

[SGaist]

What does the compile output show ?

[mrdebug]

Please have a look at the above screenshot.

[kenchan]

I think @SGaist means the output shown in the "4 Compiler Output" window, is that right @SGaist ?
BTW, why are those paths "/Users/denis/Qt5.9.2/..." etc. different from the others? different install or just the way it being displayed? might not be related to the problem though.

[Diracsbracket]

@mrdebug

I'm going crazy because of Mac OSX and Qt!

Me too!

[kenchan]

@Diracsbracket you too?

[mrdebug]

Has someone got any idea to solve?

[Diracsbracket]

@mrdebug
Hi,
I've just had a look into the header file qcompilerdetection.h (see this link) as it is the one raising the error in your screenshot. I searched for your error and found only 1 occurence for it in the file:

559	#ifdef __cplusplus
560	#  if __cplusplus < 201103L && !defined(Q_CC_MSVC)
561	#    error Qt requires a C++11 compiler and yours does not seem to be that.
562	#  endif
563	#endif

So, I tried to check the value of __cplusplus in my case, by putting the following in e.g. main.cpp:

#define DISPLAY_VALUE2(x) #x
#define DISPLAY_VALUE(x) DISPLAY_VALUE2(x)
#pragma message(DISPLAY_VALUE(__cplusplus))

It shows that on my system, the value is 201103L, thus OK.

What does it show when you use it?

[Diracsbracket]

@mrdebug
In addition, the Makefile of my test program has the following line:

CXXFLAGS      = -pipe -stdlib=libc++ -g -std=gnu++11 $(EXPORT_ARCH_ARGS) -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -mmacosx-version-min=10.10 -Wall -W -fPIC $(DEFINES)

The interesting part here is -std=gnu++11.
Would adding QMAKE_CXXFLAGS += -std=gnu++11 in your .pro file make any difference?

[mrdebug]

After may hours spent on searching the solution I have moved the project in another directory. Now the project (without any editing) was been compiled.
After that I have moved the project in its own default directory. After a clean the project was been compiled without any problem.

[SGaist]

What were the paths ?

[mrdebug]

Before
/Users/denis/IOManager/IOManager
After
/Users/denis/Cpp/IOManager/IOManager

[SGaist]

And just moving it fixed the issue ?

[mrdebug]

Yes I do.
It sounds to be very strange but I don't remember to have did something else.
I have tried to clean the output directory, by deleting the non visible files without to resolve.

Really I am very confused.

[SGaist]

Strange indeed. Oh well, the essential is that you have it working now.