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Bug#1015377: crossguid: ftbfs with LTO (link time optimization) enabled



Package: src:crossguid
Version: 0.0+git200150803-5
Severity: minor
Tags: sid bookworm
User: debian-gcc@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/crossguid_0.0+git200150803-5_unstable_dpkglto.log
The last lines of the build log are at the end of this report.

[...]

Command: dpkg-buildpackage --sanitize-env -us -uc -b -rfakeroot
dpkg-buildpackage: info: source package crossguid
dpkg-buildpackage: info: source version 0.0+git200150803-5
dpkg-buildpackage: info: source distribution unstable
dpkg-buildpackage: info: source changed by Balint Reczey <balint@balintreczey.hu>
 dpkg-source --before-build .
dpkg-buildpackage: info: host architecture amd64
 fakeroot debian/rules clean
dh clean
   debian/rules override_dh_clean
make[1]: Entering directory '/<<PKGBUILDDIR>>'
dh_clean libcrossguid.* *.o
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
 debian/rules build
dh build
   dh_update_autotools_config
   dh_autoreconf
   debian/rules override_dh_auto_build
make[1]: Entering directory '/<<PKGBUILDDIR>>'
x86_64-linux-gnu-g++ -shared -fPIC -Wall -std=c++11 -Wl,-soname,libcrossguid.so.0 -DGUID_LIBUUID \
-I/usr/include/uuid  guid.cpp -o libcrossguid.so.0.0.1 -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security -luuid \
-flto=auto -ffat-lto-objects -Wl,-z,relro
ar x /usr/lib/x86_64-linux-gnu/libuuid.a
ar cr libcrossguid.a *.o
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
   create-stamp debian/debhelper-build-stamp
 fakeroot debian/rules binary
dh binary
   dh_testroot
   dh_prep
   debian/rules override_dh_auto_install
make[1]: Entering directory '/<<PKGBUILDDIR>>'
mkdir -p debian/tmp/usr/include
mkdir -p debian/tmp/usr/lib/x86_64-linux-gnu
cp guid.h debian/tmp/usr/include/
cp libcrossguid.* debian/tmp/usr/lib/x86_64-linux-gnu/
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
   dh_install
   dh_installdocs
   dh_installchangelogs
   dh_perl
   debian/rules override_dh_link
make[1]: Entering directory '/<<PKGBUILDDIR>>'
dh_link -plibcrossguid-dev usr/lib/x86_64-linux-gnu/libcrossguid.so.0.0.1 usr/lib/x86_64-linux-gnu/libcrossguid.so
dh_link -plibcrossguid0 usr/lib/x86_64-linux-gnu/libcrossguid.so.0.0.1 usr/lib/x86_64-linux-gnu/libcrossguid.so.0
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
   dh_strip_nondeterminism
   dh_compress
   dh_fixperms
   dh_missing
   dh_dwz -a
   dh_strip -a
   dh_makeshlibs -a
dpkg-gensymbols: error: some symbols or patterns disappeared in the symbols file: see diff output below
dpkg-gensymbols: warning: debian/libcrossguid0/DEBIAN/symbols doesn't match completely debian/libcrossguid0.symbols
--- debian/libcrossguid0.symbols (libcrossguid0_0.0+git200150803-5_amd64)
+++ dpkg-gensymbolsTEmDOc	2022-06-10 09:08:38.377891114 +0000
@@ -15,6 +15,6 @@
  _ZN4GuidaSERKS_@Base 0.0+git200150803
  _ZNK4GuideqERKS_@Base 0.0+git200150803
  _ZNK4GuidneERKS_@Base 0.0+git200150803
- _ZNKSt5ctypeIcE8do_widenEc@Base 0.0+git200150803
- (optional)_ZNSt6vectorIhSaIhEEaSERKS1_@Base 0.0+git200150803
+#MISSING: 0.0+git200150803-5# _ZNKSt5ctypeIcE8do_widenEc@Base 0.0+git200150803
+#MISSING: 0.0+git200150803-5# (optional)_ZNSt6vectorIhSaIhEEaSERKS1_@Base 0.0+git200150803
  _ZlsRSoRK4Guid@Base 0.0+git200150803
dh_makeshlibs: error: failing due to earlier errors
make: *** [debian/rules:11: binary] Error 25
dpkg-buildpackage: error: fakeroot debian/rules binary subprocess returned exit status 2


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