[Development] clang and auto-setting of QT_NO_EXCEPTIONS

[Thiago Macieira]

On Thursday, 25 May 2017 13:32:54 PDT Thiago Macieira wrote:
> We're testing __EXCEPTIONS, like we should.
> 
> Please describe the environment in which:
>  a) -fno-exceptions is active
>  b) __EXCEPTIONS is defined
> 
> Provide the full command-line and the compiler version.
> 
> I still advise you to look into what's wrong with your testing, because I
> can't reproduce it.

Ok, I could reproduce this. It's Apple's bug and regression.

$ /Applications/Xcode.app/Contents/Developer/Toolchains/
XcodeDefault.xctoolchain/usr/bin/clang++ -fno-exceptions -std=c++11 -dM -E -
xobjective-c++ /dev/null | grep __EXCEPTIONS
#define __EXCEPTIONS 1

$ /Applications/Xcode6.4.app/Contents/Developer/Toolchains/
XcodeDefault.xctoolchain/usr/bin/clang++ -fno-exceptions -std=c++11 -dM -E -
xobjective-c++ /dev/null | grep __EXCEPTIONS
[nothing]

Please report to Apple. This problem does not exist upstream and did not exist 
in previous releases of their Clang.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center