https://bugs.kde.org/show_bug.cgi?id=466767
Bug ID: 466767
Summary: kwayland 5.103.0 fails to compile with LTO enabled due
to ODR violations and lto type mismatch
Classification: Frameworks and Libraries
Product: frameworks-kwayland
Version: 5.103.0
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: mgraess...@kde.org
Reporter: koce...@tutanota.com
CC: kwin-bugs-n...@kde.org
Target Milestone: ---
Created attachment 156958
--> https://bugs.kde.org/attachment.cgi?id=156958&action=edit
full build log
SUMMARY
kwayland 5.103.0 fails to compile when building with -flto -Werror=odr and
-Werror=lto-type-mismatch on Gentoo using gcc 12.2.1
/var/tmp/portage/kde-frameworks/kwayland-5.103.0/work/kwayland-5.103.0/src/client/buffer_p.h:17:29:
error: type ‘struct Private’ violates the C++ One Definition Rule [-Werror=odr]
17 | class Q_DECL_HIDDEN Buffer::Private
| ^
/var/tmp/portage/kde-frameworks/kwayland-5.103.0/work/kwayland-5.103.0/src/client/buffer_p.h:17:29:
note: a different type is defined in another translation unit
17 | class Q_DECL_HIDDEN Buffer::Private
| ^
/var/tmp/portage/kde-frameworks/kwayland-5.103.0/work/kwayland-5.103.0/src/client/buffer_p.h:25:50:
note: the first difference of corresponding definitions is field ‘nativeBuffer’
25 | WaylandPointer<wl_buffer, wl_buffer_destroy> nativeBuffer;
| ^
/var/tmp/portage/kde-frameworks/kwayland-5.103.0/work/kwayland-5.103.0/src/client/buffer_p.h:25:50:
note: a field of same name but different type is defined in another translation
unit
25 | WaylandPointer<wl_buffer, wl_buffer_destroy> nativeBuffer;
| ^
/var/tmp/portage/kde-frameworks/kwayland-5.103.0/work/kwayland-5.103.0/src/client/wayland_pointer_p.h:16:7:
note: type ‘struct WaylandPointer’ defined in anonymous namespace cannot match
across the translation unit boundary
16 | class WaylandPointer
| ^
/var/tmp/portage/kde-frameworks/kwayland-5.103.0/work/kwayland-5.103.0/src/client/surface_p.h:18:30:
error: type ‘struct Private’ violates the C++ One Definition Rule [-Werror=odr]
18 | class Q_DECL_HIDDEN Surface::Private
| ^
/var/tmp/portage/kde-frameworks/kwayland-5.103.0/work/kwayland-5.103.0/src/client/surface_p.h:18:30:
note: a different type is defined in another translation unit
18 | class Q_DECL_HIDDEN Surface::Private
| ^
/var/tmp/portage/kde-frameworks/kwayland-5.103.0/work/kwayland-5.103.0/src/client/surface_p.h:24:52:
note: the first difference of corresponding definitions is field ‘surface’
24 | WaylandPointer<wl_surface, wl_surface_destroy> surface;
| ^
/var/tmp/portage/kde-frameworks/kwayland-5.103.0/work/kwayland-5.103.0/src/client/surface_p.h:24:52:
note: a field of same name but different type is defined in another translation
unit
24 | WaylandPointer<wl_surface, wl_surface_destroy> surface;
| ^
/var/tmp/portage/kde-frameworks/kwayland-5.103.0/work/kwayland-5.103.0/src/client/wayland_pointer_p.h:16:7:
note: type ‘struct WaylandPointer’ defined in anonymous namespace cannot match
across the translation unit boundary
16 | class WaylandPointer
| ^
/var/tmp/portage/kde-frameworks/kwayland-5.103.0/work/kwayland-5.103.0/src/client/buffer_p.h:22:10:
error: type of ‘destroy’ does not match original declaration
[-Werror=lto-type-mismatch]
22 | void destroy();
| ^
/var/tmp/portage/kde-frameworks/kwayland-5.103.0/work/kwayland-5.103.0/src/client/buffer.cpp:41:6:
note: ‘destroy’ was previously declared here
41 | void Buffer::Private::destroy()
| ^
/var/tmp/portage/kde-frameworks/kwayland-5.103.0/work/kwayland-5.103.0/src/client/buffer.cpp:41:6:
note: code may be misoptimized unless ‘-fno-strict-aliasing’ is used
lto1: some warnings being treated as errors
lto-wrapper: fatal error: /usr/sbin/x86_64-pc-linux-gnu-g++ returned 1 exit
status
compilation terminated.
STEPS TO REPRODUCE
1. add -flto -Werror=odr -Werror=lto-type-mismatch to CFLAGS and CXXFLAGS
2. Try to build
3. Build failure
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