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Date: Mon, 13 Apr 2026 15:04:53 +0200
From: Emanuele Rocca &lt;ema@debian.org&gt;
To: maintonly@bugs.debian.org
Subject: idba: ftbfs with GCC-16
Message-ID: &lt;adzp9b_InbuQaFRQ@ariel.home&gt;
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Package: src:idba
Version: 1.1.3-8
Severity: important
Tags: sid forky ftbfs
User: debian-gcc@lists.debian.org
Usertags: ftbfs-gcc-16

Hi,

idba 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/idba_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.

[...]


  845 |   class IteratorImpl&lt;std::index_sequence&lt;I...&gt;&gt;
      |                           ^~~~~~~~~~~~~~
/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&lt;std::index_sequence&lt;I...&gt;&gt;
      |                                           ^~~
/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 ‘&gt;’ token [-Wtemplate-body]
  845 |   class IteratorImpl&lt;std::index_sequence&lt;I...&gt;&gt;
      |                                              ^~
/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&lt;std::make_index_sequence&lt;sizeof...(T)&gt;&gt;;
      |                                      ^~~~~~~~~~~~~~~~~~~
/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&lt;std::make_index_sequence&lt;sizeof...(T)&gt;&gt;;
      |                                                                     ^
/usr/include/gtest/internal/gtest-param-util.h: In member function ‘testing::internal::ParamIteratorInterface&lt;std::tuple&lt;_Elements ...&gt; &gt;* testing::internal::CartesianProductGenerator&lt;T&gt;::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&lt;std::tuple&lt;_Elements ...&gt; &gt;* testing::internal::CartesianProductGenerator&lt;T&gt;::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&lt;std::remove_reference_t&lt;P&gt;&gt;;
      |                     ^~~~~~~~~~~
      |                     remove_cv
/usr/include/gtest/internal/gtest-param-util.h: In instantiation of ‘class testing::internal::ValueArray&lt;bool, bool&gt;’:
/usr/include/gtest/gtest-param-test.h:360:61:   required from here
  360 | inline internal::ParamGenerator&lt;bool&gt; Bool() { return Values(false, true); }
      |                                                       ~~~~~~^~~~~~~~~~~~~
/usr/include/gtest/internal/gtest-param-util.h:819:20: error: ‘testing::internal::ValueArray&lt;Ts&gt;::v_’ has incomplete type
  819 |   FlatTuple&lt;Ts...&gt; v_;
      |                    ^~
/usr/include/gtest/internal/gtest-internal.h:1212:7: note: declaration of ‘class testing::internal::FlatTuple&lt;bool, bool&gt;’
 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&lt;Func&gt;()))&gt;
      |                                                        ^
/usr/include/gtest/gtest-param-test.h:493:56: error: missing template arguments before ‘(’ token
  493 |           typename StdFunction = decltype(std::function(std::declval&lt;Func&gt;()))&gt;
      |                                                        ^
/usr/include/gtest/gtest-param-test.h:494:1: error: ‘ConvertGenerator’ function uses ‘auto’ type specifier without trailing return type
  494 | auto ConvertGenerator(Gen&amp;&amp; gen, Func&amp;&amp; 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 &lt;typename T, std::enable_if_t&lt;std::is_convertible&lt;T, int64_t&gt;::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 ‘&gt;’ before ‘&lt;’ token
  301 |   template &lt;typename T, std::enable_if_t&lt;std::is_convertible&lt;T, int64_t&gt;::value,
      |                                         ^
make[3]: *** [Makefile:696: gtest_main.o] Error 1
make[3]: Leaving directory '/build/reproducible-path/idba-1.1.3/test'
make[2]: *** [Makefile:1238: check-am] Error 2
make[2]: Leaving directory '/build/reproducible-path/idba-1.1.3/test'
make[1]: *** [debian/rules:24: override_dh_auto_test] Error 2
make[1]: Leaving directory '/build/reproducible-path/idba-1.1.3'
make: *** [debian/rules:10: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2
]