[Pkg-kde-extras] Bug#1015606: qcoro: ftbfs with LTO (link time optimization) enabled

[Matthias Klose]

Package: src:qcoro
Version: 0.5.1-1
Severity: minor
Tags: sid bookworm
User: debian-gcc at lists.debian.org
Usertags: ftbfs-lto

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/qcoro_0.5.1-1_unstable_dpkglto.log
The last lines of the build log are at the end of this report.

[...]
- _ZN5QCoro6detail16WaitSignalHelperD0Ev at Base 0.5.0
- _ZN5QCoro6detail16WaitSignalHelperD1Ev at Base 0.5.0
- _ZN5QCoro6detail16WaitSignalHelperD2Ev at Base 0.5.0
+#MISSING: 0.5.1-1# _ZN5QCoro6detail16WaitSignalHelper7cleanupEv at Base 0.5.0
+#MISSING: 0.5.1-1# _ZN5QCoro6detail16WaitSignalHelperD0Ev at Base 0.5.0
+#MISSING: 0.5.1-1# _ZN5QCoro6detail16WaitSignalHelperD1Ev at Base 0.5.0
+#MISSING: 0.5.1-1# _ZN5QCoro6detail16WaitSignalHelperD2Ev at Base 0.5.0
  (subst)_ZN5QCoro6detail17QCoroNetworkReply15waitForFinishedENSt6chrono8durationI{int64_t}St5ratioIL{int64_t}1EL{int64_t}1000EEEE at Base 0.5.0
  (subst)_ZN5QCoro6detail17QCoroNetworkReply20waitForReadyReadImplENSt6chrono8durationI{int64_t}St5ratioIL{int64_t}1EL{int64_t}1000EEEE at Base 0.5.0
  (subst)_ZN5QCoro6detail17QCoroNetworkReply23waitForBytesWrittenImplENSt6chrono8durationI{int64_t}St5ratioIL{int64_t}1EL{int64_t}1000EEEE at Base 0.5.0
@@ -79,21 +79,21 @@
  _ZNK5QCoro6detail14QCoroTcpServer29WaitForNewConnectionOperation11await_readyEv at Base 0.4.0
  _ZNK5QCoro6detail17QCoroNetworkReply24WaitForFinishedOperation11await_readyEv at Base 0.4.0
  _ZNK5QCoro6detail17QCoroNetworkReply24WaitForFinishedOperation12await_resumeEv at Base 0.4.0
- _ZNKSt18bad_variant_access4whatEv at Base 0.5.0
- (optional=templinst)_ZNSt10unique_ptrI6QTimerSt14default_deleteIS0_EED1Ev at Base 0.4.0
- (optional=templinst)_ZNSt10unique_ptrI6QTimerSt14default_deleteIS0_EED2Ev at Base 0.4.0
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- (optional=templinst)_ZNSt8__detail9__variant16_Variant_storageILb0EJSt9monostatebNSt15__exception_ptr13exception_ptrEEE8_M_resetEv at Base 0.5.0
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  (optional=templinst|subst)_ZNSt8__detail9__variant17__gen_vtable_implINS0_12_Multi_arrayIPFvOZNS0_16_Variant_storageILb0EJSt9monostateP10QTcpSocketNSt15__exception_ptr13exception_ptrEEE8_M_resetEvEUlOT_E_RSt7variantIJS4_S6_S8_EEEJEEESt16integer_sequenceI{size_t}JL{size_t}0EEEE14__visit_invokeESD_SG_ at Base 0.5.0
  (optional=templinst|subst)_ZNSt8__detail9__variant17__gen_vtable_implINS0_12_Multi_arrayIPFvOZNS0_16_Variant_storageILb0EJSt9monostateP10QTcpSocketNSt15__exception_ptr13exception_ptrEEE8_M_resetEvEUlOT_E_RSt7variantIJS4_S6_S8_EEEJEEESt16integer_sequenceI{size_t}JL{size_t}1EEEE14__visit_invokeESD_SG_ at Base 0.5.0
  (optional=templinst|subst)_ZNSt8__detail9__variant17__gen_vtable_implINS0_12_Multi_arrayIPFvOZNS0_16_Variant_storageILb0EJSt9monostateP10QTcpSocketNSt15__exception_ptr13exception_ptrEEE8_M_resetEvEUlOT_E_RSt7variantIJS4_S6_S8_EEEJEEESt16integer_sequenceI{size_t}JL{size_t}2EEEE14__visit_invokeESD_SG_ at Base 0.5.0
@@ -109,8 +109,8 @@
  (optional=templinst|subst)_ZNSt8__detail9__variant17__gen_vtable_implINS0_12_Multi_arrayIPFvOZNS0_16_Variant_storageILb0EJSt9monostatebNSt15__exception_ptr13exception_ptrEEE8_M_resetEvEUlOT_E_RSt7variantIJS4_bS6_EEEJEEESt16integer_sequenceI{size_t}JL{size_t}0EEEE14__visit_invokeESB_SE_ at Base 0.5.0
  (optional=templinst|subst)_ZNSt8__detail9__variant17__gen_vtable_implINS0_12_Multi_arrayIPFvOZNS0_16_Variant_storageILb0EJSt9monostatebNSt15__exception_ptr13exception_ptrEEE8_M_resetEvEUlOT_E_RSt7variantIJS4_bS6_EEEJEEESt16integer_sequenceI{size_t}JL{size_t}1EEEE14__visit_invokeESB_SE_ at Base 0.5.0
  (optional=templinst|subst)_ZNSt8__detail9__variant17__gen_vtable_implINS0_12_Multi_arrayIPFvOZNS0_16_Variant_storageILb0EJSt9monostatebNSt15__exception_ptr13exception_ptrEEE8_M_resetEvEUlOT_E_RSt7variantIJS4_bS6_EEEJEEESt16integer_sequenceI{size_t}JL{size_t}2EEEE14__visit_invokeESB_SE_ at Base 0.5.0
- _ZSt26__throw_bad_variant_accessPKc at Base 0.5.0
- _ZSt26__throw_bad_variant_accessb at Base 0.5.0
+#MISSING: 0.5.1-1# _ZSt26__throw_bad_variant_accessPKc at Base 0.5.0
+#MISSING: 0.5.1-1# _ZSt26__throw_bad_variant_accessb at Base 0.5.0
  _ZTIN5QCoro6detail16QCoroLocalSocketE at Base 0.5.0
  _ZTIN5QCoro6detail17QCoroNetworkReplyE at Base 0.5.0
  _ZTIN5QCoro6detail19QCoroAbstractSocketE at Base 0.5.0
@@ -122,7 +122,7 @@
  _ZTVN5QCoro6detail16QCoroLocalSocketE at Base 0.5.0
  _ZTVN5QCoro6detail17QCoroNetworkReplyE at Base 0.5.0
  _ZTVN5QCoro6detail19QCoroAbstractSocketE at Base 0.5.0
- _ZTVSt18bad_variant_access at Base 0.5.0
+#MISSING: 0.5.1-1# _ZTVSt18bad_variant_access at Base 0.5.0
  (optional=templinst)_ZZN9QtPrivate15ConnectionTypesINS_4ListIJbEEELb1EE5typesEvE1t at Base 0.5.0
  (optional=templinst)_ZZN9QtPrivate15ConnectionTypesINS_4ListIJxEEELb1EE5typesEvE1t at Base 0.5.0
  (optional=templinst)_ZZN9QtPrivate16QMetaTypeForTypeIbE10getCopyCtrEvENUlPKNS_18QMetaTypeInterfaceEPvPKvE_4_FUNES4_S5_S7_ at Base 0.5.0
dh_makeshlibs: error: failing due to earlier errors
make: *** [debian/rules:9: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2