https://bugs.kde.org/show_bug.cgi?id=527117
Bug ID: 527117
Summary: Build fails with LTO due to ODR violations and lto
type mismatch
Classification: Frameworks and Libraries
Product: frameworks-kauth
Version First 6.29.0
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 197124
--> https://bugs.kde.org/attachment.cgi?id=197124&action=edit
/var/log/portage/build/kde-frameworks/kauth-6.29.0:20261015-141648.log
I tried to build with the following *FLAGS to optimize the build: `-flto=4
-Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing`
Link-Time Optimization is a massively global compiler optimization pass which
is pretty handy for producing faster executables. It also has the interesting
property that because the compiler does whole-program analysis using bytecode,
it can save type information and perform error checks that it normally doesn’t
have enough insight for. In particular, checking for ODR issues and checking
function type signature mismatches.
Note that *all* the -Werror=* flags are used to help detect cases where the
compiler tries to optimize by assuming Undefined Behavior (UB) cannot exist in
the source code -- if it does exist, ordinarily the code would be miscompiled,
and this says to make the miscompilation a fatal error.
I got this error:
```
FAILED: [code=1] bin/FdHelper
: && /usr/lib/ccache/bin/x86_64-pc-linux-gnu-g++ -pipe -march=native
-fstack-protector-all -O3 -fdiagnostics-color=always -frecord-gcc-switches
-freport-bug -flto=4 -Werror=odr -Werror=lto-type-mismatch
-Werror=strict-aliasing -Wformat -Werror=format-security -fno-operator-names
-fno-exceptions -Wall -Wextra -Wcast-align -Wchar-subscripts -Wformat-security
-Wno-long-long -Wpointer-arith -Wundef -Wnon-virtual-dtor -Woverloaded-virtual
-Werror=return-type -Werror=init-self -Werror=undef -Wvla -Wdate-time
-Wsuggest-override -Wlogical-op -pedantic -Wzero-as-null-pointer-constant
-Wmissing-include-dirs -fdiagnostics-color=always -Wl,--enable-new-dtags
-Wl,-O1 -Wl,--as-needed -Wl,-z,pack-relative-relocs -flto=4 -Werror=odr
-Werror=lto-type-mismatch -Werror=strict-aliasing -fdiagnostics-color=always
-Wl,--defsym=__gentoo_check_ldflags__=0
autotests/CMakeFiles/FdHelper.dir/FdHelper_autogen/mocs_compilation.cpp.o
autotests/CMakeFiles/FdHelper.dir/FdHelper.cpp.o -o bin/FdHelper
lib/libkauth_tests_static.a /usr/lib64/libQt6Gui.so.6.11.2
/usr/lib64/libGLX.so /usr/lib64/libOpenGL.so
/usr/lib64/libKF6CoreAddons.so.6.29.0 /usr/lib64/libQt6DBus.so.6.11.2
/usr/lib64/libQt6Core.so.6.11.2 && :
/var/tmp/portage/kde-frameworks/kauth-6.29.0/work/kauth-6.29.0/src/BackendsManager.h:17:24:
error: type ‘struct BackendsManager’ violates the C++ One Definition Rule
[-Werror=odr]
17 | class KAUTHCORE_EXPORT BackendsManager
| ^
/var/tmp/portage/kde-frameworks/kauth-6.29.0/work/kauth-6.29.0/autotests/BackendsManager.h:15:7:
note: a different type is defined in another translation unit
15 | class BackendsManager
| ^
/var/tmp/portage/kde-frameworks/kauth-6.29.0/work/kauth-6.29.0/src/BackendsManager.h:31:18:
note: the first difference of corresponding definitions is field ‘helper’
31 | HelperProxy *helper = nullptr;
| ^
/var/tmp/portage/kde-frameworks/kauth-6.29.0/work/kauth-6.29.0/autotests/BackendsManager.h:29:37:
note: a field with different name is defined in another translation unit
29 | QHash<QThread *, HelperProxy *> proxiesForThreads;
| ^
/var/tmp/portage/kde-frameworks/kauth-6.29.0/work/kauth-6.29.0/src/BackendsManager.h:24:18:
error: type of ‘authBackend’ does not match original declaration
[-Werror=lto-type-mismatch]
24 | AuthBackend *authBackend();
| ^
/var/tmp/portage/kde-frameworks/kauth-6.29.0/work/kauth-6.29.0/autotests/BackendsManager.cpp:48:14:
note: ‘authBackend’ was previously declared here
48 | AuthBackend *BackendsManager::authBackend()
| ^
/var/tmp/portage/kde-frameworks/kauth-6.29.0/work/kauth-6.29.0/autotests/BackendsManager.cpp:48:14:
note: code may be misoptimized unless ‘-fno-strict-aliasing’ is used
/var/tmp/portage/kde-frameworks/kauth-6.29.0/work/kauth-6.29.0/src/BackendsManager.h:25:18:
error: type of ‘helperProxy’ does not match original declaration
[-Werror=lto-type-mismatch]
25 | HelperProxy *helperProxy();
| ^
/var/tmp/portage/kde-frameworks/kauth-6.29.0/work/kauth-6.29.0/autotests/BackendsManager.cpp:57:14:
note: ‘helperProxy’ was previously declared here
57 | HelperProxy *BackendsManager::helperProxy()
| ^
/var/tmp/portage/kde-frameworks/kauth-6.29.0/work/kauth-6.29.0/autotests/BackendsManager.cpp:57:14:
note: code may be misoptimized unless ‘-fno-strict-aliasing’ is used
lto1: some warnings being treated as errors
lto-wrapper: fatal error: /usr/bin/x86_64-pc-linux-gnu-g++ returned 1 exit
status
compilation terminated.
/usr/x86_64-pc-linux-gnu/binutils-bin/2.46.1/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
```
SOFTWARE/OS VERSIONS
Operating System: Gentoo Linux 2.18
KDE Plasma Version: 6.7.5
KDE Frameworks Version: 6.29.0
Qt Version: 6.11.2
ADDITIONAL INFORMATION
Originally reported downstream: https://bugs.gentoo.org/973328
Full build log attached.
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