Bug#957940: wmcore: ftbfs with GCC-10

[Matthias Klose]

Package: src:wmcore
Version: 0.0.2+ds-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/wmcore_0.0.2+ds-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

[...]
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-a6fd3987-6698-44f1-9fc3-f625eebab4bb
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 wmcore
dpkg-buildpackage: info: source version 0.0.2+ds-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
   dh_auto_clean
	make -j1 clean
make[1]: Entering directory '/<<PKGBUILDDIR>>'
for i in wmcore.o wmgeneral.o misc.o list.o ; do \
	rm -f $i;\
done
rm -f wmcore
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
   dh_clean
 debian/rules build
dh build
   dh_update_autotools_config
   dh_auto_configure
   dh_auto_build
	make -j1
make[1]: Entering directory '/<<PKGBUILDDIR>>'
cc -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -c -O3 wmcore.c -o wmcore.o
wmcore.c: In function ‘main’:
wmcore.c:86:9: warning: variable ‘token’ set but not used [-Wunused-but-set-variable]
   86 |  char * token;
      |         ^~~~~
wmcore.c:121:4: warning: ignoring return value of ‘fgets’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  121 |    fgets(tmp,200,in);
      |    ^~~~~~~~~~~~~~~~~
wmcore.c:123:6: warning: ignoring return value of ‘fgets’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  123 |      fgets(tmp,200,in);
      |      ^~~~~~~~~~~~~~~~~
wmcore.c:165:10: warning: ignoring return value of ‘fgets’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  165 |          fgets(tmp,200,in);
      |          ^~~~~~~~~~~~~~~~~
wmcore.c:167:12: warning: ignoring return value of ‘fgets’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  167 |            fgets(tmp,200,in); // read next line
      |            ^~~~~~~~~~~~~~~~~
cc -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -c -O3 wmgeneral.c -o wmgeneral.o
cc -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -c -O3 misc.c -o misc.o
cc -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -c -O3 list.c -o list.o
cc -Wl,-z,relro -Wl,-z,now -Wall -o wmcore wmcore.o wmgeneral.o misc.o list.o -L/usr/X11R6/lib -lXpm -lXext -lX11
/usr/bin/ld: wmgeneral.o:./wmgeneral.h:39: multiple definition of `display'; wmcore.o:./wmgeneral.h:39: first defined here
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:14: wmlmon] Error 1
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
dh_auto_build: error: make -j1 returned exit code 2
make: *** [debian/rules:7: build] Error 25
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2