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

I think this (libc++1) applies to source package 'llvm-defaults'.

** Package changed: linux (Ubuntu) => llvm-defaults (Ubuntu)

** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New

** Changed in: ubuntu-z-systems
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)

** Changed in: llvm-defaults (Ubuntu)
Assignee: Skipper Bug Screeners (skipper-screen-team) => (unassigned)

** Also affects: llvm-defaults (Ubuntu Noble)
Importance: Undecided
Status: New

** Also affects: llvm-defaults (Ubuntu Oracular)
Importance: Undecided
Status: New

** Also affects: llvm-defaults (Ubuntu Plucky)
Importance: Undecided
Status: New

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https://bugs.launchpad.net/bugs/2086782

Title:
[UBUNTU 24.04] Exception handling support is disabled in
libc++/libc++abi

Status in Ubuntu on IBM z Systems:
New
Status in llvm-defaults package in Ubuntu:
New
Status in llvm-defaults source package in Noble:
New
Status in llvm-defaults source package in Oracular:
New
Status in llvm-defaults source package in Plucky:
New

Bug description:
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

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