Hi, I also ended up NMUing libunwind. Here is my diff:
>From 5dff90a8af00aeeb8db2215d3bf05453b81719a2 Mon Sep 17 00:00:00 2001 From: Helmut Grohne <[email protected]> Date: Mon, 16 Mar 2026 07:07:21 +0100 Subject: [PATCH] NMU libunwind/1.8.1-0.3 disabling C++ exception support Disable C++ exception support for all architectures. * hppa maintainer John Dave Anglin reported it (and other things) as broken via #1107618 and requested it to be disabled. * python-memray autopkgtests segfault (#1122076) when libunwind is lazy-loaded, because its semantics do not match gcc's, whose symbols it overrides. * There is another x86 segfault reported upstream (#1130107) where disabling C++ exception support makes the problem go away. * It was originally enabled in Debian to support clang/llvm (#923962), but that ends up using its own libunwind. * Fedora disables C++ exception support. * libunwind upstream recommends disabling it. https://github.com/libunwind/libunwind/issues/405#issuecomment-1209587993 * I ran autopkgtests for all rdeps with C++ exception support disabled and none of the failures is to be attributed to this change. --- debian/changelog | 8 ++++++++ debian/rules | 6 +----- 2 files changed, 9 insertions(+), 5 deletions(-) diff --git a/debian/changelog b/debian/changelog index 8b88ab6..18198a4 100644 --- a/debian/changelog +++ b/debian/changelog @@ -1,3 +1,11 @@ +libunwind (1.8.1-0.3) unstable; urgency=medium + + * Non-maintainer upload. + * Disable C++ exception support everywhere. + (Closes: #1122076, #1130107) (Addresses: #1107618) + + -- Helmut Grohne <[email protected]> Mon, 16 Mar 2026 07:03:10 +0100 + libunwind (1.8.1-0.2) unstable; urgency=medium * Non-maintainer upload diff --git a/debian/rules b/debian/rules index 76f11d9..a76f9ca 100755 --- a/debian/rules +++ b/debian/rules @@ -6,10 +6,6 @@ export DEB_BUILD_MAINT_OPTIONS = hardening=-all,+format -ifneq (,$(filter $(DEB_HOST_ARCH), amd64 i386)) - CXX_EXCEPTIONS=--enable-cxx-exceptions -endif - %: dh $@ @@ -24,7 +20,7 @@ debian/libunwind-setjmp0.%: debian/libunwind-setjmp0.%.in sed 's/@DEB_HOST_MULTIARCH@/$(DEB_HOST_MULTIARCH)/g' $< > $@ override_dh_auto_configure: - dh_auto_configure -- $(CXX_EXCEPTIONS) --disable-zlibdebuginfo --includedir=\$${prefix}/include/$(DEB_HOST_MULTIARCH) + dh_auto_configure -- --disable-cxx-exceptions --disable-zlibdebuginfo --includedir=\$${prefix}/include/$(DEB_HOST_MULTIARCH) override_dh_install: dh_install -- 2.50.1 Helmut
