[Debian-iot-maintainers] Bug#1133498: hoel: ftbfs with GCC-16

Mon Apr 13 14:04:39 BST 2026

Package: src:hoel
Version: 1.4.29-2
Severity: important
Tags: sid forky ftbfs
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-16

Hi,

hoel fails to build in a test rebuild on at least amd64 and arm64 with
gcc-16/g++-16, but builds properly with gcc-15/g++-15. The severity of this
report will be raised before the forky release.

The full build log can be found at:
https://people.debian.org/~ema/gcc-16-rebuilds/output-1/hoel_arm64.build.xz

The last lines of the build log are at the end of this report.

To build with GCC 16, either set CC=gcc-16 CXX=g++-16 explicitly,
or install the gcc, g++, gfortran, ... packages from experimental.

  apt-get -t=experimental install g++ 

Common build failures include unused (but set) variables, array subscripts
partly outside array bounds, and new/dropped symbols in Debian symbols files.
For other C/C++ related build failures see the porting guide at
http://gcc.gnu.org/gcc-16/porting_to.html

Please only close this issue after double-checking that the package can be
built correctly with GCC 16.

Please do not reassign this bug to another package. If a fix in another package
is required, then file a bug for the other package (or clone), and mark this
bug as blocked by the bug in the other package.

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Generating docs for compound _h_type_blob...
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Generating example index...
finalizing index lists...
writing tag file...
Running plantuml with JAVA...
type lookup cache used 111/65536 hits=1680 misses=119
symbol lookup cache used 338/65536 hits=1543 misses=338
finished...
dh_auto_build --
	cd build && make -j128 INSTALL="install --strip-program=true" VERBOSE=1
make[2]: Entering directory '/build/reproducible-path/hoel-1.4.29/build'
/usr/bin/cmake -S/build/reproducible-path/hoel-1.4.29 -B/build/reproducible-path/hoel-1.4.29/build --check-build-system CMakeFiles/Makefile.cmake 0
/usr/bin/cmake -E cmake_progress_start /build/reproducible-path/hoel-1.4.29/build/CMakeFiles /build/reproducible-path/hoel-1.4.29/build//CMakeFiles/progress.marks
make  -f CMakeFiles/Makefile2 all
make[3]: Entering directory '/build/reproducible-path/hoel-1.4.29/build'
make  -f CMakeFiles/hoel.dir/build.make CMakeFiles/hoel.dir/depend
make[4]: Entering directory '/build/reproducible-path/hoel-1.4.29/build'
cd /build/reproducible-path/hoel-1.4.29/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /build/reproducible-path/hoel-1.4.29 /build/reproducible-path/hoel-1.4.29 /build/reproducible-path/hoel-1.4.29/build /build/reproducible-path/hoel-1.4.29/build /build/reproducible-path/hoel-1.4.29/build/CMakeFiles/hoel.dir/DependInfo.cmake "--color=" hoel
make[4]: Leaving directory '/build/reproducible-path/hoel-1.4.29/build'
make  -f CMakeFiles/hoel.dir/build.make CMakeFiles/hoel.dir/build
make[4]: Entering directory '/build/reproducible-path/hoel-1.4.29/build'
[ 33%] Building C object CMakeFiles/hoel.dir/src/hoel-mariadb.c.o
[ 33%] Building C object CMakeFiles/hoel.dir/src/hoel-simple-json.c.o
[ 66%] Building C object CMakeFiles/hoel.dir/src/hoel.c.o
[ 66%] Building C object CMakeFiles/hoel.dir/src/hoel-sqlite.c.o
/usr/bin/cc -D_GNU_SOURCE -Dhoel_EXPORTS -I/build/reproducible-path/hoel-1.4.29/include -I/usr/include/postgresql -I/build/reproducible-path/hoel-1.4.29/build -isystem /usr/include/mysql -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/hoel-1.4.29=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Werror -std=gnu99 -fPIC -Wextra -Wconversion -MD -MT CMakeFiles/hoel.dir/src/hoel-mariadb.c.o -MF CMakeFiles/hoel.dir/src/hoel-mariadb.c.o.d -o CMakeFiles/hoel.dir/src/hoel-mariadb.c.o -c /build/reproducible-path/hoel-1.4.29/src/hoel-mariadb.c
/usr/bin/cc -D_GNU_SOURCE -Dhoel_EXPORTS -I/build/reproducible-path/hoel-1.4.29/include -I/usr/include/postgresql -I/build/reproducible-path/hoel-1.4.29/build -isystem /usr/include/mysql -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/hoel-1.4.29=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Werror -std=gnu99 -fPIC -Wextra -Wconversion -MD -MT CMakeFiles/hoel.dir/src/hoel-simple-json.c.o -MF CMakeFiles/hoel.dir/src/hoel-simple-json.c.o.d -o CMakeFiles/hoel.dir/src/hoel-simple-json.c.o -c /build/reproducible-path/hoel-1.4.29/src/hoel-simple-json.c
[ 83%] Building C object CMakeFiles/hoel.dir/src/hoel-pgsql.c.o
/usr/bin/cc -D_GNU_SOURCE -Dhoel_EXPORTS -I/build/reproducible-path/hoel-1.4.29/include -I/usr/include/postgresql -I/build/reproducible-path/hoel-1.4.29/build -isystem /usr/include/mysql -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/hoel-1.4.29=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Werror -std=gnu99 -fPIC -Wextra -Wconversion -MD -MT CMakeFiles/hoel.dir/src/hoel-sqlite.c.o -MF CMakeFiles/hoel.dir/src/hoel-sqlite.c.o.d -o CMakeFiles/hoel.dir/src/hoel-sqlite.c.o -c /build/reproducible-path/hoel-1.4.29/src/hoel-sqlite.c
/usr/bin/cc -D_GNU_SOURCE -Dhoel_EXPORTS -I/build/reproducible-path/hoel-1.4.29/include -I/usr/include/postgresql -I/build/reproducible-path/hoel-1.4.29/build -isystem /usr/include/mysql -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/hoel-1.4.29=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Werror -std=gnu99 -fPIC -Wextra -Wconversion -MD -MT CMakeFiles/hoel.dir/src/hoel-pgsql.c.o -MF CMakeFiles/hoel.dir/src/hoel-pgsql.c.o.d -o CMakeFiles/hoel.dir/src/hoel-pgsql.c.o -c /build/reproducible-path/hoel-1.4.29/src/hoel-pgsql.c
/usr/bin/cc -D_GNU_SOURCE -Dhoel_EXPORTS -I/build/reproducible-path/hoel-1.4.29/include -I/usr/include/postgresql -I/build/reproducible-path/hoel-1.4.29/build -isystem /usr/include/mysql -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/hoel-1.4.29=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Werror -std=gnu99 -fPIC -Wextra -Wconversion -MD -MT CMakeFiles/hoel.dir/src/hoel.c.o -MF CMakeFiles/hoel.dir/src/hoel.c.o.d -o CMakeFiles/hoel.dir/src/hoel.c.o -c /build/reproducible-path/hoel-1.4.29/src/hoel.c
/build/reproducible-path/hoel-1.4.29/src/hoel-mariadb.c: In function ‘h_execute_query_json_mariadb’:
/build/reproducible-path/hoel-1.4.29/src/hoel-mariadb.c:247:25: error: variable ‘row’ set but not used [-Werror=unused-but-set-variable=]
  247 |   uint num_fields, col, row;
      |                         ^~~
cc1: all warnings being treated as errors
make[4]: *** [CMakeFiles/hoel.dir/build.make:96: CMakeFiles/hoel.dir/src/hoel-mariadb.c.o] Error 1
make[4]: *** Waiting for unfinished jobs....
make[4]: Leaving directory '/build/reproducible-path/hoel-1.4.29/build'
make[3]: *** [CMakeFiles/Makefile2:94: CMakeFiles/hoel.dir/all] Error 2
make[3]: Leaving directory '/build/reproducible-path/hoel-1.4.29/build'
make[2]: *** [Makefile:169: all] Error 2
make[2]: Leaving directory '/build/reproducible-path/hoel-1.4.29/build'
dh_auto_build: error: cd build && make -j128 INSTALL="install --strip-program=true" VERBOSE=1 returned exit code 2
make[1]: *** [debian/rules:33: override_dh_auto_build] Error 25
make[1]: Leaving directory '/build/reproducible-path/hoel-1.4.29'
make: *** [debian/rules:14: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2