[Bug 2086782] [NEW] [UBUNTU 24.04] Exception handling support is disabled in libc++/libc++abi

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Currently the C++ exception handling support is disabled for s390x when
building libc++/libc++abi packages:

ifneq (,$(filter $(DEB_HOST_ARCH),s390x))
STAGE_ALL_CMAKE_EXTRA += -DLLVM_HOST_TRIPLE=s390x-linux-gnu
LIBCXX_EXCEPTIONS := OFF

However, this is supposed to work on s390x and has already been enabled
in other distros. Please, remove the s390x special handling here.

Be aware that we used to lack proper libunwind support for Z, what might
have triggered this. But this has been solved some time ago.

---
Ubuntu package:
libc++abi1-18 1:18.1.3-1ubuntu1


---------------------------------------------------
libunwind could be enabled for s390x as well:

# Enable libunwind (or not)
LIBUNWIND_ENABLE=yes
ifneq (,$(filter $(DEB_HOST_ARCH), s390x armel m68k mipsel mips64el hurd-i386 powerpc sparc sparc64 x32))
LIBUNWIND_ENABLE=no

** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New


** Tags: architecture-s39064 bugnameltc-208925 severity-high targetmilestone-inin---
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[UBUNTU 24.04] Exception handling support is disabled in libc++/libc++abi
https://bugs.launchpad.net/bugs/2086782
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