This package currently fails to build (at least on the amd64 architecture) with link time optimizations enabled. For a background for LTO please see https://wiki.debian.org/ToolChain/LTO The goal is to enable this optimization by default in an upcoming Debian release in dpkg-buildflags for 64bit architectures. The goal is to get this package to build with link time optimizations, or to explicitly disable link time optimizations for this package build. To reproduce the build failure, enable the lto optimization in testing/unstable by adding "optimize=+lto" to DEB_BUILD_MAINT_OPTIONS in the debian/rules file, or if this macro is unset, just set it: export DEB_BUILD_MAINT_OPTIONS = optimize=+lto Please try to fix the build with lto enabled, fixing the packaging or forwarding the issue upstream. If the issue cannot be fixed, explicitly disallow building the package with lto by adding to your rules file: export DEB_BUILD_MAINT_OPTIONS = optimize=-lto or adding that string to your existing setting of DEB_BUILD_MAINT_OPTIONS. The full build log can be found at: http://qa-logs.debian.net/2022/06/09/dpkglto/nng_1.5.2-2_unstable_dpkglto.log The last lines of the build log are at the end of this report. [...] 52: 96 assertions thus far 52: 52: --- PASS: MultiProtocol/Transport Stress (0.00s) 52: PASS 52: ok /<<PKGBUILDDIR>>/build-static/tests/multistress 30.073s 85/86 Test #52: nng.multistress ............................. Passed 30.08 sec 69: DOING reqrep0 (req 2 rep 1) address: ws://127.0.0.1:26500/nng_reqstress 69: DOING reqrep0 (req 4 rep 3) address: ws://127.0.0.1:26501/nng_reqstress 69: DOING reqrep0 (req 6 rep 5) address: ws://127.0.0.1:26502/nng_reqstress 69: DOING reqrep0 (req 8 rep 7) address: ws://127.0.0.1:26503/nng_reqstress 69: DOING reqrep0 (req 9 rep 7) address: inproc://nng_reqstress_26504 69: DOING reqrep0 (req 11 rep 10) address: tcp://127.0.0.1:26505 69: DOING reqrep0 (req 12 rep 10) address: tcp://127.0.0.1:26506 69: DOING reqrep0 (req 14 rep 13) address: ipc:///tmp/nng_reqstress_26507 69: DOING reqrep0 (req 16 rep 15) address: inproc://nng_reqstress_26508 69: DOING reqrep0 (req 18 rep 17) address: tcp://127.0.0.1:26509 69: DOING reqrep0 (req 19 rep 17) address: ws://127.0.0.1:26510/nng_reqstress 69: DOING reqrep0 (req 21 rep 20) address: ws://127.0.0.1:26511/nng_reqstress 69: DOING reqrep0 (req 23 rep 22) address: ws://127.0.0.1:26512/nng_reqstress 69: WAITING for 30 sec... 69: === RUN: Req/Rep Stress 69: 69: All tests worked RESULT socket 1 (rep) sent 3378 recd 3378 fail 0 69: ✔✔RESULT socket 2 (req) sent 3378 recd 3378 fail 0 69: ✔✔RESULT socket 3 (rep) sent 3239 recd 3239 fail 0 69: ✔✔RESULT socket 4 (req) sent 3239 recd 3239 fail 0 69: ✔✔RESULT socket 5 (rep) sent 3211 recd 3211 fail 0 69: ✔✔RESULT socket 6 (req) sent 3211 recd 3211 fail 0 69: ✔✔RESULT socket 7 (rep) sent 7598 recd 7598 fail 0 69: ✔✔RESULT socket 8 (req) sent 3153 recd 3153 fail 0 69: ✔✔RESULT socket 9 (req) sent 4445 recd 4445 fail 0 69: ✔✔RESULT socket 10 (rep) sent 7458 recd 7458 fail 0 69: ✔✔RESULT socket 11 (req) sent 3707 recd 3707 fail 0 69: ✔✔RESULT socket 12 (req) sent 3751 recd 3751 fail 0 69: ✔✔RESULT socket 13 (rep) sent 3800 recd 3800 fail 0 69: ✔✔RESULT socket 14 (req) sent 3800 recd 3800 fail 0 69: ✔✔RESULT socket 15 (rep) sent 4298 recd 4298 fail 0 69: ✔✔RESULT socket 16 (req) sent 4298 recd 4298 fail 0 69: ✔✔RESULT socket 17 (rep) sent 7198 recd 7198 fail 0 69: ✔✔RESULT socket 18 (req) sent 3776 recd 3776 fail 0 69: ✔✔RESULT socket 19 (req) sent 3422 recd 3422 fail 0 69: ✔✔RESULT socket 20 (rep) sent 3157 recd 3157 fail 0 69: ✔✔RESULT socket 21 (req) sent 3157 recd 3157 fail 0 69: ✔✔RESULT socket 22 (rep) sent 3183 recd 3183 fail 0 69: ✔✔RESULT socket 23 (req) sent 3183 recd 3183 fail 0 69: ✔✔ 69: 69: 69: 46 assertions thus far 69: 69: --- PASS: Req/Rep Stress (0.00s) 69: PASS 69: ok /<<PKGBUILDDIR>>/build-static/tests/reqstress 30.148s 86/86 Test #69: nng.reqstress ............................... Passed 30.15 sec 98% tests passed, 2 tests failed out of 86 Total Test time (real) = 37.34 sec The following tests FAILED: 51 - nng.ipcwinsec (Failed) 53 - nng.nonblock (Failed) Errors while running CTest make[2]: *** [Makefile:94: test] Error 8 make[2]: Leaving directory '/<<PKGBUILDDIR>>/build-static' dh_auto_test: error: cd build-static && make -j8 test ARGS\+=--verbose ARGS\+=-j8 returned exit code 2 make[1]: *** [debian/rules:23: override_dh_auto_test] Error 25 make[1]: Leaving directory '/<<PKGBUILDDIR>>' make: *** [debian/rules:31: build] Error 2 dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2