cc @tstellar

and cc @sharkcz

The 4 other Fedora Rawhide GCC 3.x seems fine.

The 3 other Fedora Rawhide Clang 3.x seems fine as well.

For now, it seems like only 2 buildbot workers are affected:

• PPC64LE Fedora Rawhide Clang 3.x: https://buildbot.python.org/all/#/builders/33/builds/2287 -- started to fail at "June 23, 2020 1:41 PM" (5 hours ago)
• PPC64LE Fedora Rawhide Clang Installed 3.x: https://buildbot.python.org/all/#/builders/312/builds/2208 -- started to fail at "June 23, 2020 1:42 PM" (5 hours ago)

Reproducer, bug.c:

#include <stdio.h>
int main() { return 0; }

Build with clang:

$ clang bla.c -o bla -O2 
In file included from bla.c:1:
In file included from /usr/include/stdio.h:899:
/usr/include/bits/stdio-ldbl.h:26:20: error: cannot apply asm label to function after its first use
__LDBL_REDIR_DECL (vfprintf)
~~~~~~~~~~~~~~~~~~~^~~~~~~~~
/usr/include/sys/cdefs.h:569:26: note: expanded from macro '__LDBL_REDIR_DECL'
  extern __typeof (name) name __asm (__ASMNAME ("__" #name "ieee128"));
                         ^           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

I believe this is a known issue between latest glibc and clang after we default to the ieee128 long double type.

On PPC64LE Fedora Rawhide Clang 3.x, /usr/include/bits/stdio-ldbl.h comes from the package: glibc-devel-2.35.9000-22.fc37.ppc64le.

cc @serge-sans-paille

cc @fweimer-rh

Sorry, the Python bug tracker is the wrong place to discuss glibc regression. Please discuss the issue in this Fedora glibc issue:
https://bugzilla.redhat.com/show_bug.cgi?id=2100546

Previous successful build: https://buildbot.python.org/all/#/builders/33/builds/2286

test.pythoninfo:

CC.version: clang version 14.0.0 (Fedora 14.0.0-1.fc37)
platform.libc_ver: glibc 2.35.9000
platform.platform: Linux-5.18.0-0.rc6.47.fc37.ppc64le-ppc64le-with-glibc2.35.9000

dnf.log:

2022-06-23T07:02:51-0400 DEBUG Upgraded: clang-14.0.0-4.fc37.ppc64le