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The new condvar implementation is not supported by the GDB pretty-printers. I will have to disable them (at least for condvars) because this blocks updating Fedora rawhide.
To be clear, this is an issue which manifests at build time, so it is a hard blocker for glibc development.
Torvald, Could you please have a look at this? commit 23b5cae1af04f2d912910fdaf73cb482265798c1 Author: Martin Galvan <martin.galvan> Date: Thu Dec 8 18:59:02 2016 +0530 Add pretty printers for the NPTL lock types We now have pretty printers for the NPTL lock types, and we need subsequent changes to them to match the new condvar implemenation. Effectively it's a new requirement on any implementation changes. There are now also tests for these e.g. nptl/test-*-printers* which use gdb and python (expect framework) to drive gdb and a coupled test.
So I suppose we need new patches for condvar and rwlock, which we'll then use instead of the old ones for Rawhide. I'll put it on my list.
I have a workaround with which I can build glibc in rawhide. I'll use that for the time being. It means that we currently do not have the pretty-printers installed.
This is fixed upstream: commit ed19993b5b0d05d62cc883571519a67dae481a14 Author: Torvald Riegel <triegel> Date: Wed May 25 23:43:36 2016 +0200 New condvar implementation that provides stronger ordering guarantees. Which has pretty printer support rolled in.
This bug appears to have been reported against 'rawhide' during the Fedora 26 development cycle. Changing version to '26'.
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The commit in comment 5 went into glibc 2.25, so this is actually fixed in Fedora 26.