[Bug 1949988] Re: undefined symbol: pthread_yield

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: glibc (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1949988

Title:
  undefined symbol: pthread_yield

Status in glibc package in Ubuntu:
  Confirmed

Bug description:
  Hello,

  while compiling our software in a Ubuntu jammy docker image I noticed
  a backward incompatibility issue in glibc 2.34-0ubuntu3. Our build
  fails with:

  ld.lld: error: undefined symbol: pthread_yield
  >>> referenced by tlibthrd.cxx:1546 (ptlib/unix/tlibthrd.cxx:1546)
  >>>               tlib.o:(PTimedMutex::~PTimedMutex()) in archive /builds/ExternalLibs/ptlib/2.10.9_1591084383/Applications_ubuntu2004_x64_cxx17_clang10/lib/libpt_d_s.a
  >>> did you mean: pthread_yield at GLIBC_2.2.5
  >>> defined in: /lib/x86_64-linux-gnu/libc.so.6

  The libpt_d_s.a library was statically built on Ubuntu 20.04 and
  depends on a lot of pthread symbols:

  $ nm /builds/ExternalLibs/ptlib/2.10.9_1591084383/Applications_ubuntu2004_x64_cxx17_clang10/lib/libpt_d_s.a|grep -i " U pthread"|sort -u
                   U pthread_attr_destroy
                   U pthread_attr_init
                   U pthread_attr_setschedparam
                   U pthread_attr_setschedpolicy
                   U pthread_attr_setstacksize
                   ...
                   U pthread_yield

  Recompiling libpt against the current glibc will redirect from
  pthread_yield to sched_yield, but nevertheless it would be nice if
  existing libraries could be used for the transition phase.

  The changes behavior is most likely due to
  https://sourceware.org/git/?p=glibc.git;a=commit;h=c2fd60a5861efef48252f5cc7efc70e1d8a0da9a

  Thanks,
  Gregor

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