Bug#1075278: mlpack: ftbfs with GCC-14

[Matthias Klose]

Package: src:mlpack
Version: 4.4.0-1
Severity: important
Tags: sid trixie
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-14

[This bug is 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-14/g++-14, but succeeds to build with gcc-13/g++-13. The
severity of this report will be raised before the trixie release.

The full build log can be found at:
http://qa-logs.debian.net/2024/07/01/mlpack_4.4.0-1_unstable_gccexp.log
The last lines of the build log are at the end of this report.

To build with GCC 14, either set CC=gcc-14 CXX=g++-14 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-14/porting_to.html

[...]
/usr/include/stb/stb_image_write.h:514:32: warning: missing initializer for member ‘stbi__write_context::context’ [-Wmissing-field-initializers]
  514 |    stbi__write_context s = { 0 };
      |                                ^
/usr/include/stb/stb_image_write.h:514:32: warning: missing initializer for member ‘stbi__write_context::buffer’ [-Wmissing-field-initializers]
/usr/include/stb/stb_image_write.h:514:32: warning: missing initializer for member ‘stbi__write_context::buf_used’ [-Wmissing-field-initializers]
/usr/include/stb/stb_image_write.h: In function ‘int stbi_write_bmp(const char*, int, int, int, const void*)’:
/usr/include/stb/stb_image_write.h:522:32: warning: missing initializer for member ‘stbi__write_context::context’ [-Wmissing-field-initializers]
  522 |    stbi__write_context s = { 0 };
      |                                ^
/usr/include/stb/stb_image_write.h:522:32: warning: missing initializer for member ‘stbi__write_context::buffer’ [-Wmissing-field-initializers]
/usr/include/stb/stb_image_write.h:522:32: warning: missing initializer for member ‘stbi__write_context::buf_used’ [-Wmissing-field-initializers]
/usr/include/stb/stb_image_write.h: In function ‘int stbi_write_tga_to_func(void (*)(void*, void*, int), void*, int, int, int, const void*)’:
/usr/include/stb/stb_image_write.h:613:32: warning: missing initializer for member ‘stbi__write_context::context’ [-Wmissing-field-initializers]
  613 |    stbi__write_context s = { 0 };
      |                                ^
/usr/include/stb/stb_image_write.h:613:32: warning: missing initializer for member ‘stbi__write_context::buffer’ [-Wmissing-field-initializers]
/usr/include/stb/stb_image_write.h:613:32: warning: missing initializer for member ‘stbi__write_context::buf_used’ [-Wmissing-field-initializers]
/usr/include/stb/stb_image_write.h: In function ‘int stbi_write_tga(const char*, int, int, int, const void*)’:
/usr/include/stb/stb_image_write.h:621:32: warning: missing initializer for member ‘stbi__write_context::context’ [-Wmissing-field-initializers]
  621 |    stbi__write_context s = { 0 };
      |                                ^
/usr/include/stb/stb_image_write.h:621:32: warning: missing initializer for member ‘stbi__write_context::buffer’ [-Wmissing-field-initializers]
/usr/include/stb/stb_image_write.h:621:32: warning: missing initializer for member ‘stbi__write_context::buf_used’ [-Wmissing-field-initializers]
/usr/include/stb/stb_image_write.h: In function ‘int stbi_write_hdr_to_func(void (*)(void*, void*, int), void*, int, int, int, const float*)’:
/usr/include/stb/stb_image_write.h:789:32: warning: missing initializer for member ‘stbi__write_context::context’ [-Wmissing-field-initializers]
  789 |    stbi__write_context s = { 0 };
      |                                ^
/usr/include/stb/stb_image_write.h:789:32: warning: missing initializer for member ‘stbi__write_context::buffer’ [-Wmissing-field-initializers]
/usr/include/stb/stb_image_write.h:789:32: warning: missing initializer for member ‘stbi__write_context::buf_used’ [-Wmissing-field-initializers]
/usr/include/stb/stb_image_write.h: In function ‘int stbi_write_hdr(const char*, int, int, int, const float*)’:
/usr/include/stb/stb_image_write.h:796:32: warning: missing initializer for member ‘stbi__write_context::context’ [-Wmissing-field-initializers]
  796 |    stbi__write_context s = { 0 };
      |                                ^
/usr/include/stb/stb_image_write.h:796:32: warning: missing initializer for member ‘stbi__write_context::buffer’ [-Wmissing-field-initializers]
/usr/include/stb/stb_image_write.h:796:32: warning: missing initializer for member ‘stbi__write_context::buf_used’ [-Wmissing-field-initializers]
/usr/include/stb/stb_image_write.h: In function ‘int stbi_write_jpg_to_func(void (*)(void*, void*, int), void*, int, int, int, const void*, int)’:
/usr/include/stb/stb_image_write.h:1609:32: warning: missing initializer for member ‘stbi__write_context::context’ [-Wmissing-field-initializers]
 1609 |    stbi__write_context s = { 0 };
      |                                ^
/usr/include/stb/stb_image_write.h:1609:32: warning: missing initializer for member ‘stbi__write_context::buffer’ [-Wmissing-field-initializers]
/usr/include/stb/stb_image_write.h:1609:32: warning: missing initializer for member ‘stbi__write_context::buf_used’ [-Wmissing-field-initializers]
/usr/include/stb/stb_image_write.h: In function ‘int stbi_write_jpg(const char*, int, int, int, const void*, int)’:
/usr/include/stb/stb_image_write.h:1618:32: warning: missing initializer for member ‘stbi__write_context::context’ [-Wmissing-field-initializers]
 1618 |    stbi__write_context s = { 0 };
      |                                ^
/usr/include/stb/stb_image_write.h:1618:32: warning: missing initializer for member ‘stbi__write_context::buffer’ [-Wmissing-field-initializers]
/usr/include/stb/stb_image_write.h:1618:32: warning: missing initializer for member ‘stbi__write_context::buf_used’ [-Wmissing-field-initializers]
In file included from /<<PKGBUILDDIR>>/src/mlpack/core/kernels/kernels.hpp:17,
                 from /<<PKGBUILDDIR>>/src/mlpack/core.hpp:54:
/<<PKGBUILDDIR>>/src/mlpack/core/kernels/cauchy_kernel.hpp: At global scope:
/<<PKGBUILDDIR>>/src/mlpack/core/kernels/cauchy_kernel.hpp:80:3: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
   80 |   const double Bandwidth() const { return bandwidth; }
      |   ^~~~~
In file included from /<<PKGBUILDDIR>>/src/mlpack/core/kernels/kernels.hpp:19:
/<<PKGBUILDDIR>>/src/mlpack/core/kernels/epanechnikov_kernel.hpp:74:3: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
   74 |   const double Bandwidth() const { return bandwidth; }
      |   ^~~~~
In file included from /<<PKGBUILDDIR>>/src/mlpack/core/kernels/kernels.hpp:27:
/<<PKGBUILDDIR>>/src/mlpack/core/kernels/spherical_kernel.hpp:33:3: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
   33 |   const double Bandwidth() const { return bandwidth; }
      |   ^~~~~
make[3]: *** [src/mlpack/methods/CMakeFiles/mlpack_range_search.dir/build.make:79: src/mlpack/methods/CMakeFiles/mlpack_range_search.dir/range_search/range_search_main.cpp.o] Error 1
make[3]: Leaving directory '/<<PKGBUILDDIR>>/obj-x86_64-linux-gnu'
make[2]: *** [CMakeFiles/Makefile2:4669: src/mlpack/methods/CMakeFiles/mlpack_range_search.dir/all] Error 2
make[2]: Leaving directory '/<<PKGBUILDDIR>>/obj-x86_64-linux-gnu'
make[1]: *** [Makefile:149: all] Error 2
make[1]: Leaving directory '/<<PKGBUILDDIR>>/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:69: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2