Bug 1541613

Failed koji builds:
https://koji.fedoraproject.org/koji/taskinfo?taskID=24590275
https://koji.fedoraproject.org/koji/taskinfo?taskID=24590264

This bug appears to have been reported against 'rawhide' during the Fedora 28 development cycle.
Changing version to '28'.

This message is a reminder that Fedora 28 is nearing its end of life.
On 2019-May-28 Fedora will stop maintaining and issuing updates for
Fedora 28. It is Fedora's policy to close all bug reports from releases
that are no longer maintained. At that time this bug will be closed as
EOL if it remains open with a Fedora 'version' of '28'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version' 
to a later Fedora version.

Thank you for reporting this issue and we are sorry that we were not 
able to fix it before Fedora 28 is end of life. If you would still like 
to see this bug fixed and are able to reproduce it against a later version 
of Fedora, you are encouraged  change the 'version' to a later Fedora 
version prior this bug is closed as described in the policy above.

Although we aim to fix as many bugs as possible during every release's 
lifetime, sometimes those efforts are overtaken by events. Often a 
more recent Fedora release includes newer upstream software that fixes 
bugs or makes them obsolete.

This bug appears to have been reported against 'rawhide' during the Fedora 31 development cycle.
Changing version to '31'.

This bug appears to have been reported against 'rawhide' during the Fedora 31 development cycle.
Changing version to 31.

It does not look like the new double format is going to make it into F31. Changing back to rawhide.

This bug appears to have been reported against 'rawhide' during the Fedora 32 development cycle.
Changing version to 32.

This message is a reminder that Fedora 32 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora 32 on 2021-05-25.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
Fedora 'version' of '32'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version' 
to a later Fedora version.

Thank you for reporting this issue and we are sorry that we were not 
able to fix it before Fedora 32 is end of life. If you would still like 
to see this bug fixed and are able to reproduce it against a later version 
of Fedora, you are encouraged  change the 'version' to a later Fedora 
version prior this bug is closed as described in the policy above.

Although we aim to fix as many bugs as possible during every release's 
lifetime, sometimes those efforts are overtaken by events. Often a 
more recent Fedora release includes newer upstream software that fixes 
bugs or makes them obsolete.

This bug appears to have been reported against 'rawhide' during the Fedora 35 development cycle.
Changing version to 35.

With long double changes enabled in rawhide, I am getting a different error:
https://kojipkgs.fedoraproject.org//work/tasks/19/82140019/build.log

*** WARNING *** there are active plugins, do not report this as a bug unless you can reproduce it without enabling any plugins.
Event                            | Plugins
PLUGIN_FINISH_UNIT               | annobin: Generate final annotations
PLUGIN_START_UNIT                | annobin: Generate global annotations
PLUGIN_ALL_PASSES_START          | annobin: Generate per-function annotations
PLUGIN_ALL_PASSES_END            | annobin: Register per-function end symbols
In file included from ../../../../../src/emu/video/rgbutil.h:24,
                 from ../../../../../src/mame/drivers/rollext.cpp:123:
../../../../../src/emu/video/rgbvmx.h: In member function 'void rgbaint_t::set(u32)':
../../../../../src/emu/video/rgbvmx.h:49:62: internal compiler error: Segmentation fault
   49 |                 m_value = VECS32(vec_mergeh(VECS16(vec_mergeh(temp, VECS8(zero))), VECS16(zero)));
      |                                                              ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugzilla.redhat.com/bugzilla> for instructions.
make[2]: *** [gaelco.make:586: ../../../../linux_gcc/obj/x64/Release/src/mame/drivers/rollext.o] Error 1
make[2]: *** Waiting for unfinished jobs....

I can reproduce the issue with annobin disabled too:

In file included from ../../../../../src/emu/video/rgbutil.h:24,
                 from ../../../../../src/emu/rendersw.hxx:14,
                 from ../../../../../src/emu/video.cpp:16:
../../../../../src/emu/video/rgbvmx.h: In member function 'void rgbaint_t::set(u32)':
../../../../../src/emu/video/rgbvmx.h:49:62: internal compiler error: in fold_convert_loc, at fold-const.cc:2450
   49 |                 m_value = VECS32(vec_mergeh(VECS16(vec_mergeh(temp, VECS8(zero))), VECS16(zero)));
      |                                                              ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugzilla.redhat.com/bugzilla> for instructions.

Seems to be PCH related, looks like rs6000_builtin_info[?].fntype contains random garbage.
When PCH is disabled, compiles just fine.
Will try to reproduce tomorrow on a simpler testcase.