Re: 4 errors generated when compiling Quad_MX,hh

[Paul Rockwell]

Peter/Jürgen

Success with adding the -std=gnu++11 flag to the compiler on High Sierra.

TL;DR

I was able to test this on a VM with macOS High Sierra, and I’m seeing the same thing as Peter did.

I ran the script that checks for the C++ standard being used, and it returns 199711L - indicating that the Apple compiler defaults to a C++ standard earlier than C++ 11. I was able to confirm that the Xcode command line tools for that version of macOS does support the C++11 standard by including -std=gnu++11 to the compiler arguments and re-running the test.

To test my theory out on High Sierra, I ran:

./configure CXXFLAGS=“-g -O2 -std=gnu++11”

make

The build succeeded. Rather than make the configure specific for macOS platforms, I’d suggest using the configure command above. Quick, dirty, and achieves the desired goal.

As an aside, It also appears that there is a test in the configure process for seeing if C++ 11 features are available without additional flags. Without the -std=gnu++11, the test fails (I looked at config.log for the gory details). But configure returns:

checking for g++ option to enable C++11 features... none needed

so you’d never know that the test actually failed without scouring the logs.

I’m not that aware of all the changes made in the various C++ standards iterations, but I wonder if what was added for Quad_MX.hh is C++11 and later code. I also have a question about what C++ standard GNU APL is written for. Does it require or assume that the compiler supports  C++11 or later?

- paul

On Dec 1, 2024, at 11:56 PM, Paul Rockwell <paulrockwell@mac.com> wrote:

Peter (and Jűrgen) 

I think I've got a High Sierra VM hanging around that I might be able to install the XCode command line tools on so I can test to see if gnu++11 is a supported standards option. If that's the case, I'll download the latest GNU APL

SVN and see if it compiles successfully.

 I'll do that tomorrow for you.

- paul