#error <atomic> is not implemented

ROOT
1

Hi,

I’ve seen a thread with a similar error to this ([ROOT 6 atomic error Any time I try to compile code against ROOT 6.03.04, I get errors from the include RTypes.h at line 37 (#include ) like:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/…/include/c++/v1/atomic:539:2: fatal error: is not implemented
#error is not implemented

I’m running this on OSX 10.10.3, with XCode 6.3.

I’m not sure where to start in resolving this, anyone have any ideas?

Thanks,
Matt

2

Hi Matt,

we can start with a simple reproducer.
Could you show the problem in a simple source file to compile and link against ROOT6?

Cheers,
Danilo

3

Hi all,

I’m having the same problem. Just updated to the v6-02-00-patches branch and compiled this new ROOT version successfully with RooFit enabled, but then when I try to install RooUnfold against it, the installation crashes with this error message. Any ideas?

Thanks,
Chris

4

Hi,

The code in atomic reads#if !__has_feature(cxx_atomic) #error <atomic> is not implemented #else … which would trigger the problem if the code is compiled without enabling C++11

Most likely the issue is with the Unfold makefile which is forgetting to enable C++11 … which is quite likely since the tar file (at least from where you are pointing at) have not been updated for several years.

Cheers,
Philippe.