On 10/3/20 7:20 PM, Mr wrote:
> "Mr" <mauriceraybaud [at] hotmail dot fr>> wrote:
...
> (using CLANG-cl compiler in MSVS2019 from its internal installer, and ISO C++ 17
> language version
> 

The code to which you are pointing is not familiar to me.

Have you tried compiling with the compiler flag '-std=c++11' ?

For windows compiles, the libraries necessary are in the libraries 
directory. In the official POV-Ray code base these have not been updated 
in a long time. Further, the POV-Ray base code is only ensured to work 
with c++11.

In what state you might find the libraries directory in hgpovray38 I do 
not know. Jerome was a Ubuntu user last I knew.

On unix/linux based systems the libraries are install-able based upon a 
release of whatever version of unix/linux/osx one runs. Therefore these 
libraries will work (are supposed to work) with the default c/c++ 
compiler version shipped. Compiles in the unix/linux/osx environments do 
not use the libraries directory.

The g++ default for Ubuntu 18.04.1 and 20.04.1 to which I just upgraded 
is c++14. I also set -std=c++11 occasionally to test I have not 
introduced something code wise which will not compile at that standard. 
In doing that for povr, I'm pretty sure POV-Ray itself still OK at c++11.

I've also played with compiles using -std=c++17, but these don't compile 
on 18.04 systems because the Ubuntu 18.04 'libraries' are not compatible 
with c++17(1). A hint the even older libraries directory versions likely 
are not.

(1) I've not yet tried a -stdc++17 compile on Ubuntu 20.04.1 - in part 
because I've been busy these past few days cleaning up new warnings in 
the povr code base I now see in the Ubuntu 20.04.1 environment!

My upfront guess is the windows libraries directory is out of date for 
the environment in which you are compiling. Give -std=c++11 a try. If 
you're lucky, let us know.

Bill P.

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