stdatomic.h - missing?

[Yutanix]

I get to the "make" step after "./configure", but then get countless errors regarding a file called "stdatomic.h" that is supposed to be in /Include/mimalloc/
ive tried the new nogil source, and still have the same problem with that file missing.

[colesbury]

stdatomic.h is a C header file provided by the C standard library. What compiler are you using? What operating system?

[Yutanix]

the "make" cmd to compile everything, and im on a Cent OS 7.8 box.

[colesbury]

Thanks. On CentOS make is probably using GCC as the compiler (unless you've changed the default compiler.) What version of gcc do you have? Can you run gcc --version and let me know the output?

[Yutanix]

gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-44)

[colesbury]

I guess there's a build problem with GCC 4.8.5. I can fix that, but it'll probably be a few days before I get to it. In the meantime you can download a pre-built version or install and use a newer version of GCC.

There's a pre-built version for Linux at https://github.com/colesbury/nogil/releases. You can download and use it with the following commands:

curl -L https://github.com/colesbury/nogil/releases/download/v3.9.10-nogil-2023-04-01/python-3.9.10-nogil-linux.tar.gz -o python-3.9.10-nogil-linux.tar.gz
tar xf python-3.9.10-nogil-linux.tar.gz
cd python-3.9.10-nogil-linux/bin
export PATH=`pwd`:$PATH

(Or you can move the python-3.9.10-nogil-linux directory to wherever you want. Just make sure you add the python-3.9.10-nogil-linux/bin directory to your path.)

[colesbury]

Hi @Yutanix, sorry for the delay. After looking into it, the issues appears to be that mimalloc doesn't support GCC 4.8. At this point, I want to avoid diverging further from upstream mimalloc, so I don't plan to fix that.

To use nogil Python, you can either use the pre-built binary (linked above) or install a newer version of GCC (or Clang).