Bug#1143659: goxel: FTBFS: src/palette.c:69:9: error: variable 'linen' set but not used [-Werror=unused-but-set-variable=]

Package: src:goxel
Version: 0.15.1-1
Severity: serious
Tags: ftbfs forky sid

Dear maintainer:

During a rebuild of all packages in unstable, this package failed to build.

Below you will find the last part of the build log (probably the most
relevant part, but not necessarily). If required, the full build log
is available here:

https://people.debian.org/~sanvila/build-logs/202608/

About the archive rebuild: The build was made on virtual machines from AWS,
using sbuild and a reduced chroot with only build-essential packages.

If you cannot reproduce the bug please contact me privately, as I
am willing to provide ssh access to a virtual machine where the bug is
fully reproducible.

If this is really a bug in one of the build-depends, please use
reassign and add an affects on src:goxel, so that this is still
visible in the BTS web page for this package.

Thanks.

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[...]
 debian/rules clean
dh clean
   debian/rules override_dh_auto_clean
make[1]: Entering directory '/<<PKGBUILDDIR>>'
scons -c
scons: Reading SConscript files ...
Checking for C library libpng... yes
scons: done reading SConscript files.
scons: Cleaning targets ...
scons: done cleaning targets.
rm -rf .sconf_temp config.log debian/goxel.1 goxel.xpm goxel.png
rm -rf .sconsign.dblite
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
   dh_clean
	rm -f debian/debhelper-build-stamp
	rm -rf debian/.debhelper/
	rm -f -- debian/goxel.substvars debian/files
	rm -fr -- debian/goxel/ debian/tmp/
	find .  \( \( \
		\( -path .\*/.git -o -path .\*/.svn -o -path .\*/.bzr -o -path .\*/.hg -o -path .\*/CVS -o -path .\*/.pc -o -path .\*/_darcs \) -prune -o -type f -a \
	        \( -name '#*#' -o -name '.*~' -o -name '*~' -o -name DEADJOE \
		 -o -name '*.orig' -o -name '*.rej' -o -name '*.bak' \
		 -o -name '.*.orig' -o -name .*.rej -o -name '.SUMS' \
		 -o -name TAGS -o \( -path '*/.deps/*' -a -name '*.P' \) \
		\) -exec rm -f {} + \) -o \
		\( -type d -a \( -name autom4te.cache -o -name __pycache__ \) -prune -exec rm -rf {} + \) \)
 debian/rules binary
dh binary
   dh_update_autotools_config
   dh_autoreconf
   dh_auto_configure
   debian/rules override_dh_auto_build
make[1]: Entering directory '/<<PKGBUILDDIR>>'
scons cycles=0 debug=0 clang=1 --jobs=2 --no-cache
scons: Reading SConscript files ...
Checking for C library libpng... yes
scons: done reading SConscript files.
scons: Building targets ...
g++ -o ext_src/nfd/nfd_gtk.o -c -std=gnu++17 -Wall -Wno-narr [too-long-redacted] timizer ext_src/nfd/nfd_gtk.cpp
Building compilation database compile_commands.json
gcc -o src/action.o -c -std=gnu99 -Wall -Wno-unknow-pragma - [too-long-redacted] _src/meshoptimizer src/action.c
gcc -o src/assets.o -c -std=gnu99 -Wall -Wno-unknow-pragma - [too-long-redacted] _src/meshoptimizer src/assets.c
gcc -o src/camera.o -c -std=gnu99 -Wall -Wno-unknow-pragma - [too-long-redacted] _src/meshoptimizer src/camera.c
gcc -o src/file_format.o -c -std=gnu99 -Wall -Wno-unknow-pra [too-long-redacted] meshoptimizer src/file_format.c
gcc -o src/filters.o -c -std=gnu99 -Wall -Wno-unknow-pragma  [too-long-redacted] src/meshoptimizer src/filters.c
gcc -o src/filters/colors.o -c -std=gnu99 -Wall -Wno-unknow- [too-long-redacted] hoptimizer src/filters/colors.c
gcc -o src/filters/wrap.o -c -std=gnu99 -Wall -Wno-unknow-pr [too-long-redacted] eshoptimizer src/filters/wrap.c
gcc -o src/formats/gltf.o -c -std=gnu99 -Wall -Wno-unknow-pr [too-long-redacted] eshoptimizer src/formats/gltf.c
gcc -o src/formats/gox.o -c -std=gnu99 -Wall -Wno-unknow-pra [too-long-redacted] meshoptimizer src/formats/gox.c
gcc -o src/formats/minetest.o -c -std=gnu99 -Wall -Wno-unkno [too-long-redacted] ptimizer src/formats/minetest.c
gcc -o src/formats/png.o -c -std=gnu99 -Wall -Wno-unknow-pra [too-long-redacted] meshoptimizer src/formats/png.c
gcc -o src/formats/png_slices.o -c -std=gnu99 -Wall -Wno-unk [too-long-redacted] imizer src/formats/png_slices.c
gcc -o src/formats/povray.o -c -std=gnu99 -Wall -Wno-unknow- [too-long-redacted] hoptimizer src/formats/povray.c
gcc -o src/formats/qubicle.o -c -std=gnu99 -Wall -Wno-unknow [too-long-redacted] optimizer src/formats/qubicle.c
gcc -o src/formats/qubicle2.o -c -std=gnu99 -Wall -Wno-unkno [too-long-redacted] ptimizer src/formats/qubicle2.c
gcc -o src/formats/txt.o -c -std=gnu99 -Wall -Wno-unknow-pra [too-long-redacted] meshoptimizer src/formats/txt.c
gcc -o src/formats/vox.o -c -std=gnu99 -Wall -Wno-unknow-pra [too-long-redacted] meshoptimizer src/formats/vox.c
gcc -o src/formats/voxlap.o -c -std=gnu99 -Wall -Wno-unknow- [too-long-redacted] hoptimizer src/formats/voxlap.c
gcc -o src/formats/vxl.o -c -std=gnu99 -Wall -Wno-unknow-pra [too-long-redacted] meshoptimizer src/formats/vxl.c
gcc -o src/formats/wavefront.o -c -std=gnu99 -Wall -Wno-unkn [too-long-redacted] timizer src/formats/wavefront.c
gcc -o src/gesture.o -c -std=gnu99 -Wall -Wno-unknow-pragma  [too-long-redacted] src/meshoptimizer src/gesture.c
gcc -o src/gesture3d.o -c -std=gnu99 -Wall -Wno-unknow-pragm [too-long-redacted] c/meshoptimizer src/gesture3d.c
gcc -o src/gizmos.o -c -std=gnu99 -Wall -Wno-unknow-pragma - [too-long-redacted] _src/meshoptimizer src/gizmos.c
gcc -o src/goxel.o -c -std=gnu99 -Wall -Wno-unknow-pragma -W [too-long-redacted] t_src/meshoptimizer src/goxel.c
g++ -o src/gui.o -c -std=gnu++17 -Wall -Wno-narrowing -g -O2 [too-long-redacted] t_src/meshoptimizer src/gui.cpp
gcc -o src/gui/about.o -c -std=gnu99 -Wall -Wno-unknow-pragm [too-long-redacted] c/meshoptimizer src/gui/about.c
gcc -o src/gui/app.o -c -std=gnu99 -Wall -Wno-unknow-pragma  [too-long-redacted] src/meshoptimizer src/gui/app.c
gcc -o src/gui/cameras_panel.o -c -std=gnu99 -Wall -Wno-unkn [too-long-redacted] timizer src/gui/cameras_panel.c
gcc -o src/gui/debug_panel.o -c -std=gnu99 -Wall -Wno-unknow [too-long-redacted] optimizer src/gui/debug_panel.c
gcc -o src/gui/edit_panel.o -c -std=gnu99 -Wall -Wno-unknow- [too-long-redacted] hoptimizer src/gui/edit_panel.c
gcc -o src/gui/export_panel.o -c -std=gnu99 -Wall -Wno-unkno [too-long-redacted] ptimizer src/gui/export_panel.c
gcc -o src/gui/image_panel.o -c -std=gnu99 -Wall -Wno-unknow [too-long-redacted] optimizer src/gui/image_panel.c
gcc -o src/gui/layers_panel.o -c -std=gnu99 -Wall -Wno-unkno [too-long-redacted] ptimizer src/gui/layers_panel.c
gcc -o src/gui/light_panel.o -c -std=gnu99 -Wall -Wno-unknow [too-long-redacted] optimizer src/gui/light_panel.c
gcc -o src/gui/material_panel.o -c -std=gnu99 -Wall -Wno-unk [too-long-redacted] imizer src/gui/material_panel.c
gcc -o src/gui/menu.o -c -std=gnu99 -Wall -Wno-unknow-pragma [too-long-redacted] rc/meshoptimizer src/gui/menu.c
gcc -o src/gui/palette_panel.o -c -std=gnu99 -Wall -Wno-unkn [too-long-redacted] timizer src/gui/palette_panel.c
gcc -o src/gui/quit.o -c -std=gnu99 -Wall -Wno-unknow-pragma [too-long-redacted] rc/meshoptimizer src/gui/quit.c
gcc -o src/gui/render_panel.o -c -std=gnu99 -Wall -Wno-unkno [too-long-redacted] ptimizer src/gui/render_panel.c
gcc -o src/gui/settings.o -c -std=gnu99 -Wall -Wno-unknow-pr [too-long-redacted] eshoptimizer src/gui/settings.c
gcc -o src/gui/snap_panel.o -c -std=gnu99 -Wall -Wno-unknow- [too-long-redacted] hoptimizer src/gui/snap_panel.c
gcc -o src/gui/symmetry_panel.o -c -std=gnu99 -Wall -Wno-unk [too-long-redacted] imizer src/gui/symmetry_panel.c
gcc -o src/gui/tools_panel.o -c -std=gnu99 -Wall -Wno-unknow [too-long-redacted] optimizer src/gui/tools_panel.c
gcc -o src/gui/topbar.o -c -std=gnu99 -Wall -Wno-unknow-prag [too-long-redacted] /meshoptimizer src/gui/topbar.c
gcc -o src/gui/view_panel.o -c -std=gnu99 -Wall -Wno-unknow- [too-long-redacted] hoptimizer src/gui/view_panel.c
gcc -o src/i18n.o -c -std=gnu99 -Wall -Wno-unknow-pragma -Wn [too-long-redacted] xt_src/meshoptimizer src/i18n.c
gcc -o src/image.o -c -std=gnu99 -Wall -Wno-unknow-pragma -W [too-long-redacted] t_src/meshoptimizer src/image.c
g++ -o src/imgui.o -c -std=gnu++17 -Wall -Wno-narrowing -g - [too-long-redacted] src/meshoptimizer src/imgui.cpp
gcc -o src/layer.o -c -std=gnu99 -Wall -Wno-unknow-pragma -W [too-long-redacted] t_src/meshoptimizer src/layer.c
gcc -o src/main.o -c -std=gnu99 -Wall -Wno-unknow-pragma -Wn [too-long-redacted] xt_src/meshoptimizer src/main.c
gcc -o src/marchingcube.o -c -std=gnu99 -Wall -Wno-unknow-pr [too-long-redacted] eshoptimizer src/marchingcube.c
gcc -o src/material.o -c -std=gnu99 -Wall -Wno-unknow-pragma [too-long-redacted] rc/meshoptimizer src/material.c
g++ -o src/meshoptimizer.o -c -std=gnu++17 -Wall -Wno-narrow [too-long-redacted] optimizer src/meshoptimizer.cpp
gcc -o src/model3d.o -c -std=gnu99 -Wall -Wno-unknow-pragma  [too-long-redacted] src/meshoptimizer src/model3d.c
gcc -o src/palette.o -c -std=gnu99 -Wall -Wno-unknow-pragma  [too-long-redacted] src/meshoptimizer src/palette.c
src/palette.c: In function ‘parse_gpl’:
src/palette.c:69:9: error: variable ‘linen’ set but not used [-Werror=unused-but-set-variable=]
   69 |     int linen, r, g, b, nb = 0;
      |         ^~~~~
At top level:
cc1: note: unrecognized command-line option ‘-Wno-unknown-warning-option’ may have been intended to silence earlier diagnostics
cc1: note: unrecognized command-line option ‘-Wno-unknow-pragma’ may have been intended to silence earlier diagnostics
cc1: all warnings being treated as errors
scons: *** [src/palette.o] Error 1
scons: building terminated because of errors.
make[1]: *** [debian/rules:22: override_dh_auto_build] Error 2
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:14: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2
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