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Re: [Bug-gnubg] Gnubg on MacOS High Sierra

From: Marcell Fulop
Subject: Re: [Bug-gnubg] Gnubg on MacOS High Sierra
Date: Mon, 11 Dec 2017 21:19:15 +1100

I can confirm that with --enable-simd=no and --without-board3d gnubg
is back to normal. That is very good, thanks for the advice!

As I mentioned, I could also build it --with-board3d (which is
probably the default when GLU is detected) but it's broken.
Ironically, the 3D board, dice, animations are perfect and I can even
play! All other parts of the GUI are black no matter what (resizing,
restarting) but buttons and menus actually work if you can navigate
them blindly.

On Mon, Dec 11, 2017 at 9:59 AM, Marcell Fulop <address@hidden> wrote:
> Hi Philippe,
> To clarify, I have no background in C and Make and the likes other
> than being a software engineer and advanced Linux user I built several
> C programs and resolved many conflicts but these are mostly trial and
> error based experiments.
>> You wrote earlier that you built it with gcc 7. A few months ago, I
>> tried to build gnubg on FreeBSD with its gcc 7 port (that was tagged as
>> a development version at the time) and the evaluations were broken when
>> using SIMD instructions (SSE or AVX).
> That's right, I did use gcc-7 but I tried different compilers during a
> number of attempts. (System compiler and gcc, g++ from the homebrew
> gcc7 package.) I didn't make it quite clear which compiler was used
> for the build I was referring to so I will clarify that.
>> Other cases (gcc 7 when not using SIMD instructions, clang or earlier
>> gcc versions, gcc 7 with SIMD instructions on Linux) worked fine. I
>> didn't pursue the matter (the compiler was a development version...) and
>> gave up on gcc 7 on FreeBSD.
>> I think gcc creates the include files it uses from the system files.
>> Since MacOS and FreeBSD both use clang as system compiler, could it be
>> possible that its SIMD intrinsics include files are somehow broken when
>> generated from clang's ones ? Or that we use them in a subtly wrong way
>> and don't get away with it any more in this configuration ?
>> You could try to build gnubg configured with --enable-simd=no with gcc 7
>> (it will be 2-3 times slower), or in the default configuration with
>> another compiler and see if it makes a difference.
> Definitely will give a try building it w/o SIMD and also different
> compilers and compare any successful builds.
> As a note, I built 1.04.000 with board3d, OpenGL and GLU successfully
> for the first time yesterday. I'll start another thread about that.

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