[Debian-med-packaging] Bug#1133491: gentle: ftbfs with GCC-16

[Emanuele Rocca]

Package: src:gentle
Version: 1.9.5~alpha2+dfsg1-3
Severity: important
Tags: sid forky ftbfs
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-16

Hi,

gentle 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/gentle_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.

[...]


      |                           ^~~~~~~~~~~~~~
/usr/include/gtest/internal/gtest-param-util.h:845:27: note: ‘std::index_sequence’ is only available from C++14 onwards
/usr/include/gtest/internal/gtest-param-util.h:845:27: error: ‘index_sequence’ is not a member of ‘std’ [-Wtemplate-body]
/usr/include/gtest/internal/gtest-param-util.h:845:27: note: ‘std::index_sequence’ is only available from C++14 onwards
/usr/include/gtest/internal/gtest-param-util.h:845:43: error: expected parameter pack before ‘...’ [-Wtemplate-body]
  845 |   class IteratorImpl<std::index_sequence<I...>>
      |                                           ^~~
/usr/include/gtest/internal/gtest-param-util.h:845:43: error: template argument 1 is invalid [-Wtemplate-body]
/usr/include/gtest/internal/gtest-param-util.h:845:46: error: expected unqualified-id before ‘>’ token [-Wtemplate-body]
  845 |   class IteratorImpl<std::index_sequence<I...>>
      |                                              ^~
/usr/include/gtest/internal/gtest-param-util.h:936:38: error: ‘make_index_sequence’ is not a member of ‘std’ [-Wtemplate-body]
  936 |   using Iterator = IteratorImpl<std::make_index_sequence<sizeof...(T)>>;
      |                                      ^~~~~~~~~~~~~~~~~~~
/usr/include/gtest/internal/gtest-param-util.h:936:38: note: ‘std::make_index_sequence’ is only available from C++14 onwards
/usr/include/gtest/internal/gtest-param-util.h:936:38: error: ‘make_index_sequence’ is not a member of ‘std’ [-Wtemplate-body]
/usr/include/gtest/internal/gtest-param-util.h:936:38: note: ‘std::make_index_sequence’ is only available from C++14 onwards
/usr/include/gtest/internal/gtest-param-util.h:936:69: error: template argument 1 is invalid [-Wtemplate-body]
  936 |   using Iterator = IteratorImpl<std::make_index_sequence<sizeof...(T)>>;
      |                                                                     ^
/usr/include/gtest/internal/gtest-param-util.h: In member function ‘testing::internal::ParamIteratorInterface<std::tuple<_Elements ...> >* testing::internal::CartesianProductGenerator<T>::Begin() const’:
/usr/include/gtest/internal/gtest-param-util.h:835:16: error: expected type-specifier before ‘Iterator’ [-Wtemplate-body]
  835 |     return new Iterator(this, generators_, false);
      |                ^~~~~~~~
/usr/include/gtest/internal/gtest-param-util.h:835:16: error: expected ‘;’ before ‘Iterator’ [-Wtemplate-body]
/usr/include/gtest/internal/gtest-param-util.h: In member function ‘testing::internal::ParamIteratorInterface<std::tuple<_Elements ...> >* testing::internal::CartesianProductGenerator<T>::End() const’:
/usr/include/gtest/internal/gtest-param-util.h:838:16: error: expected type-specifier before ‘Iterator’ [-Wtemplate-body]
  838 |     return new Iterator(this, generators_, true);
      |                ^~~~~~~~
/usr/include/gtest/internal/gtest-param-util.h:838:16: error: expected ‘;’ before ‘Iterator’ [-Wtemplate-body]
/usr/include/gtest/internal/gtest-param-util.h: At global scope:
/usr/include/gtest/internal/gtest-param-util.h:1053:21: error: ‘remove_cv_t’ in namespace ‘std’ does not name a template type; did you mean ‘remove_cv’? [-Wtemplate-body]
 1053 |   using type = std::remove_cv_t<std::remove_reference_t<P>>;
      |                     ^~~~~~~~~~~
      |                     remove_cv
/usr/include/gtest/internal/gtest-param-util.h: In instantiation of ‘class testing::internal::ValueArray<bool, bool>’:
/usr/include/gtest/gtest-param-test.h:360:61:   required from here
  360 | inline internal::ParamGenerator<bool> Bool() { return Values(false, true); }
      |                                                       ~~~~~~^~~~~~~~~~~~~
/usr/include/gtest/internal/gtest-param-util.h:819:20: error: ‘testing::internal::ValueArray<Ts>::v_’ has incomplete type
  819 |   FlatTuple<Ts...> v_;
      |                    ^~
/usr/include/gtest/internal/gtest-internal.h:1212:7: note: declaration of ‘class testing::internal::FlatTuple<bool, bool>’
 1212 | class FlatTuple
      |       ^~~~~~~~~
/usr/include/gtest/gtest-param-test.h:483:56: error: missing template arguments before ‘(’ token
  483 |           typename StdFunction = decltype(std::function(std::declval<Func>()))>
      |                                                        ^
/usr/include/gtest/gtest-param-test.h:493:56: error: missing template arguments before ‘(’ token
  493 |           typename StdFunction = decltype(std::function(std::declval<Func>()))>
      |                                                        ^
/usr/include/gtest/gtest-param-test.h:494:1: error: ‘ConvertGenerator’ function uses ‘auto’ type specifier without trailing return type
  494 | auto ConvertGenerator(Gen&& gen, Func&& f) {
      | ^~~~
/usr/include/gtest/gtest-param-test.h:494:1: note: deduced return type only available with ‘-std=c++14’ or ‘-std=gnu++14’
/usr/include/gtest/gtest.h:301:30: error: ‘std::enable_if_t’ has not been declared
  301 |   template <typename T, std::enable_if_t<std::is_convertible<T, int64_t>::value,
      |                              ^~~~~~~~~~~
/usr/include/gtest/gtest.h:301:30: note: ‘std::enable_if_t’ is only available from C++14 onwards
/usr/include/gtest/gtest.h:301:41: error: expected ‘>’ before ‘<’ token
  301 |   template <typename T, std::enable_if_t<std::is_convertible<T, int64_t>::value,
      |                                         ^
make[3]: *** [Makefile:761: my_tests-TXMLfile_test.o] Error 1
make[3]: Leaving directory '/build/reproducible-path/gentle-1.9.5~alpha2+dfsg1/tests'
make[2]: *** [Makefile:1050: check-am] Error 2
make[2]: Leaving directory '/build/reproducible-path/gentle-1.9.5~alpha2+dfsg1/tests'
make[1]: *** [Makefile:418: check-recursive] Error 1
make[1]: Leaving directory '/build/reproducible-path/gentle-1.9.5~alpha2+dfsg1'
dh_auto_test: error: make -j128 check TESTSUITEFLAGS="-j128 --verbose" VERBOSE=1 returned exit code 2
make: *** [debian/rules:12: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2