Bug#957951: wmsysmon: ftbfs with GCC-10

[Matthias Klose]

Package: src:wmsysmon
Version: 0.7.7+git20150808-1
Severity: normal
Tags: sid bullseye
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-10

Please keep this issue open in the bug tracker for the package it
was filed for.  If a fix in another package is required, please
file a bug for the other package (or clone), and add a block in this
package. Please keep the issue open until the package can be built in
a follow-up test rebuild.

The package fails to build in a test rebuild on at least amd64 with
gcc-10/g++-10, but succeeds to build with gcc-9/g++-9. The
severity of this report will be raised before the bullseye release,
so nothing has to be done for the buster release.

The full build log can be found at:
http://people.debian.org/~doko/logs/gcc10-20200225/wmsysmon_0.7.7+git20150808-1_unstable_gcc10.log
The last lines of the build log are at the end of this report.

To build with GCC 10, either set CC=gcc-10 CXX=g++-10 explicitly,
or install the gcc, g++, gfortran, ... packages from experimental.

  apt-get -t=experimental install g++ 

Common build failures are new warnings resulting in build failures with
-Werror turned on, or new/dropped symbols in Debian symbols files.
For other C/C++ related build failures see the porting guide at
http://gcc.gnu.org/gcc-10/porting_to.html

[...]
gpgv: Can't check signature: No public key
dpkg-source: warning: failed to verify signature on ./wmsysmon_0.7.7+git20150808-1.dsc
dpkg-source: info: extracting wmsysmon in /<<PKGBUILDDIR>>
dpkg-source: info: unpacking wmsysmon_0.7.7+git20150808.orig.tar.gz
dpkg-source: info: unpacking wmsysmon_0.7.7+git20150808-1.debian.tar.xz

Check disk space
----------------

Sufficient free space for build

User Environment
----------------

APT_CONFIG=/var/lib/sbuild/apt.conf
HOME=/sbuild-nonexistent
LANG=C.UTF-8
LC_ALL=C.UTF-8
LOGNAME=user42
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
SCHROOT_ALIAS_NAME=unstable
SCHROOT_CHROOT_NAME=sid-amd64-sbuild
SCHROOT_COMMAND=env
SCHROOT_GID=1001
SCHROOT_GROUP=user42
SCHROOT_SESSION_ID=sid-amd64-sbuild-d3cbbab4-ef16-4ea4-8664-14a376c1e66a
SCHROOT_UID=1001
SCHROOT_USER=user42
SHELL=/bin/sh
USER=user42

dpkg-buildpackage
-----------------

Command: dpkg-buildpackage -us -uc -b -rfakeroot
dpkg-buildpackage: info: source package wmsysmon
dpkg-buildpackage: info: source version 0.7.7+git20150808-1
dpkg-buildpackage: info: source distribution unstable
dpkg-buildpackage: info: source changed by Doug Torrance <dtorrance at piedmont.edu>
 dpkg-source --before-build .
dpkg-buildpackage: info: host architecture amd64
 fakeroot debian/rules clean
dh clean --sourcedirectory=src
   dh_auto_clean -O--sourcedirectory=src
	cd src && make -j1 clean
make[1]: Entering directory '/<<PKGBUILDDIR>>/src'
rm -f wmgeneral.o wmsysmon.o wmsysmon
make[1]: Leaving directory '/<<PKGBUILDDIR>>/src'
   dh_clean -O--sourcedirectory=src
 debian/rules build
dh build --sourcedirectory=src
   dh_update_autotools_config -O--sourcedirectory=src
   dh_auto_configure -O--sourcedirectory=src
   dh_auto_build -O--sourcedirectory=src
	cd src && make -j1
make[1]: Entering directory '/<<PKGBUILDDIR>>/src'
gcc -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -O3 -fomit-frame-pointer   -Wdate-time -D_FORTIFY_SOURCE=2  -c -o wmgeneral.o wmgeneral.c
gcc -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -O3 -fomit-frame-pointer   -Wdate-time -D_FORTIFY_SOURCE=2  -c -o wmsysmon.o wmsysmon.c
In file included from wmsysmon.c:41:
wmgeneral.h:60:13: warning: inline function ‘DirtyWindow’ declared but never defined
   60 | inline void DirtyWindow(int, int, unsigned int, unsigned int);
      |             ^~~~~~~~~~~
gcc -Wl,-z,relro -Wl,-z,now -o wmsysmon wmgeneral.o wmsysmon.o -L/usr/X11R6/lib -lXpm -lXext -lX11 -lm
/usr/bin/ld: wmsysmon.o:./src/wmgeneral.h:41: multiple definition of `display'; wmgeneral.o:./src/wmgeneral.h:41: first defined here
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:14: wmsysmon] Error 1
make[1]: Leaving directory '/<<PKGBUILDDIR>>/src'
dh_auto_build: error: cd src && make -j1 returned exit code 2
make: *** [debian/rules:6: build] Error 25
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2