[Bug 293384] science/py-tensorflow: fix build with libc++ 21

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293384

--- Comment #2 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/ports/commit/?id=814f8741c251862849f74431be09c0ab969e936a

commit 814f8741c251862849f74431be09c0ab969e936a
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2026-02-23 13:18:05 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2026-03-13 08:29:30 +0000

    science/py-tensorflow: fix build with libc++ 21

    With libc++ 21 science/py-tensorflow fails to build, with errors similar
    to:

        In file included from
tensorflow/tsl/framework/allocator_registry.cc:16:
        In file included from
./tensorflow/tsl/framework/allocator_registry.h:23:
        In file included from ./tensorflow/tsl/framework/allocator.h:28:
        ./tensorflow/tsl/framework/type_traits.h:96:8: error: 'is_signed'
cannot be specialized: Users are not allowed to specialize this standard
library entity [-Winvalid-specialization]
           96 | struct is_signed<tsl::qint8> : public is_signed<tsl::int8> {};
              |        ^
        /usr/include/c++/v1/__type_traits/is_signed.h:25:8: note: marked
'_Clang::no_specializations' here
           25 | struct _LIBCPP_NO_SPECIALIZATIONS is_signed :
_BoolConstant<__is_signed(_Tp)> {};
              |        ^
        /usr/include/c++/v1/__config:1167:9: note: expanded from macro
'_LIBCPP_NO_SPECIALIZATIONS'
         1167 |       [[_Clang::__no_specializations__("Users are not allowed
to specialize this standard library entity")]]
              |         ^

    and later:

        tensorflow/lite/kernels/elementwise.cc:245:14: error: no matching
function for call to 'EvalImpl'
          245 |       return EvalImpl<float>(context, node, std::abs<float>,
type);
              |              ^~~~~~~~~~~~~~~
        tensorflow/lite/kernels/elementwise.cc:192:21: note: candidate function
template not viable: no overload of 'abs' matching 'std::function<float
(float)>' for 3rd argument
          192 | inline TfLiteStatus EvalImpl(TfLiteContext* context,
TfLiteNode* node,
              |                     ^
          193 |                              std::function<T(T)> func,
              |                              ~~~~~~~~~~~~~~~~~~~~~~~~

    The former is fixed by https://github.com/openxla/xla/commit/0cead9f,
    which unfortunately happened after tsl got split off from tensorflow
    into a bunch of separate projects.

    The latter is fixed as part of
    https://github.com/tensorflow/tensorflow/commit/358119a, but that commit
    is quite large. Only the changes to elementwise.cc need to be applied.

    PR:             293384
    Approved by:    maintainer timeout (2 weeks)
    MFH:            2026Q1

 ...ch-tensorflow_lite_kernels_elementwise.cc (new) | 22 ++++++++++++++++++++++
 ...h-tensorflow_tsl_framework_type__traits.h (new) | 21 +++++++++++++++++++++
 2 files changed, 43 insertions(+)

-- 
You are receiving this mail because:
You are the assignee for the bug.