Bug#1097171: libcgns: ftbfs with GCC-15

[Matthias Klose]

Package: src:libcgns
Version: 3.4.0-5
Severity: important
Tags: sid forky
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-15

[This bug is NOT targeted to the upcoming trixie release]

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-15/g++-15, but succeeds to build with gcc-14/g++-14. The
severity of this report will be raised before the forky release.

The full build log can be found at:
http://qa-logs.debian.net/2025/02/16/amd64exp/libcgns_3.4.0-5_unstable_gccexp.log.gz
The last lines of the build log are at the end of this report.

To build with GCC 15, either set CC=gcc-15 CXX=g++-15 explicitly,
or install the gcc, g++, gfortran, ... packages from experimental.

  apt-get -t=experimental install g++ 

GCC 15 now defaults to the C23/C++23 standards, exposing many FTBFS.
Other 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-15/porting_to.html

[...]
      |             ^~~~~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:2074:17: error: too many arguments to function ‘push_var’; expected 0, have 1
 2074 |                 push_var (sin (f1));
      |                 ^~~~~~~~  ~~~~~~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:1666:13: note: declared here
 1666 | static void push_var (v)
      |             ^~~~~~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:2077:17: error: too many arguments to function ‘pop_var’; expected 0, have 1
 2077 |                 pop_var (&f1);
      |                 ^~~~~~~  ~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:1683:13: note: declared here
 1683 | static void pop_var (v)
      |             ^~~~~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:2078:17: error: too many arguments to function ‘push_var’; expected 0, have 1
 2078 |                 push_var (sqrt (f1));
      |                 ^~~~~~~~  ~~~~~~~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:1666:13: note: declared here
 1666 | static void push_var (v)
      |             ^~~~~~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:2081:17: error: too many arguments to function ‘pop_var’; expected 0, have 1
 2081 |                 pop_var (&f1);
      |                 ^~~~~~~  ~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:1683:13: note: declared here
 1683 | static void pop_var (v)
      |             ^~~~~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:2082:17: error: too many arguments to function ‘push_var’; expected 0, have 1
 2082 |                 push_var (f1 * f1);
      |                 ^~~~~~~~  ~~~~~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:1666:13: note: declared here
 1666 | static void push_var (v)
      |             ^~~~~~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:2085:17: error: too many arguments to function ‘pop_var’; expected 0, have 1
 2085 |                 pop_var (&f1);
      |                 ^~~~~~~  ~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:1683:13: note: declared here
 1683 | static void pop_var (v)
      |             ^~~~~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:2086:17: error: too many arguments to function ‘push_var’; expected 0, have 1
 2086 |                 push_var (tanh (f1));
      |                 ^~~~~~~~  ~~~~~~~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:1666:13: note: declared here
 1666 | static void push_var (v)
      |             ^~~~~~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:2089:17: error: too many arguments to function ‘pop_var’; expected 0, have 1
 2089 |                 pop_var (&f1);
      |                 ^~~~~~~  ~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:1683:13: note: declared here
 1683 | static void pop_var (v)
      |             ^~~~~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:2090:17: error: too many arguments to function ‘push_var’; expected 0, have 1
 2090 |                 push_var (tan (f1));
      |                 ^~~~~~~~  ~~~~~~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:1666:13: note: declared here
 1666 | static void push_var (v)
      |             ^~~~~~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:2097:5: error: too many arguments to function ‘pop_var’; expected 0, have 1
 2097 |     pop_var (&f1);
      |     ^~~~~~~  ~~~
/build/reproducible-path/libcgns-3.4.0/src/cgnstools/calclib/vec.c:1683:13: note: declared here
 1683 | static void pop_var (v)
      |             ^~~~~~~
make[3]: *** [src/cgnstools/calclib/CMakeFiles/calclib.dir/build.make:96: src/cgnstools/calclib/CMakeFiles/calclib.dir/vec.c.o] Error 1
make[3]: Leaving directory '/build/reproducible-path/libcgns-3.4.0/obj-x86_64-linux-gnu'
make[2]: *** [CMakeFiles/Makefile2:2950: src/cgnstools/calclib/CMakeFiles/calclib.dir/all] Error 2
make[2]: Leaving directory '/build/reproducible-path/libcgns-3.4.0/obj-x86_64-linux-gnu'
make[1]: *** [Makefile:169: all] Error 2
make[1]: Leaving directory '/build/reproducible-path/libcgns-3.4.0/obj-x86_64-linux-gnu'
dh_auto_build: error: cd obj-x86_64-linux-gnu && make -j1 "INSTALL=install --strip-program=true" VERBOSE=1 returned exit code 2
make: *** [debian/rules:26: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2