HashState::HashStateBase doesn't resolve in MSVC + Cuda 13.4

Describe the issue

It seems that

friend class HashState::HashStateBase

and 

friend class MixingHashState::HashStateBase;

Fails with

tmpxft_00001e10_00000000-7_range_impl.compute_120a.cudafe1.cpp
absl/hash/internal/hash.h(1428): error C3856: 'HashStateBase': symbol is not a class template
absl/hash/internal/hash.h(1428): error C2098: unexpected token after data member 'MixingHashState'
absl/hash/internal/hash.h(1428): error C2059: syntax error: '>'
absl/hash/hash.h(371): error C3856: 'HashStateBase': symbol is not a class template
absl/hash/hash.h(371): error C2098: unexpected token after data member 'HashState'
absl/hash/hash.h(371): error C2059: syntax error: '>'
absl/container/flat_hash_map.h(141): error C2248: 'absl::lts_20260526::container_internal::raw_hash_map<T>::Hash': cannot access private typedef declared in class 'absl::lts_20260526::container_internal::raw_hash_map<T>'

Steps to reproduce the problem

build onnxruntime 1.30.0's CUDA execution provider on Windows against the installed abseil; any .cu file that reaches absl/hash/hash.h or absl/container/flat_hash_map.h fails. There is no minimal standalone reproducer yet, only the CI logs.

feedstock (recipe) at the time of failure https://github.com/hmaarrfk/onnxruntime-feedstock/tree/70e25022c8580a0a60a54453fa436961de6633f0/recipe

One caveat worth stating in the report: onnxruntime hit the friend error
job-logs_failure.txt

What version of Abseil are you using?

LTS 20260526.0 (inline namespace absl::lts_20260526), consumed as the conda-forge libabseil 20260526.0 package, build cxx17_h04e5de1_2 (shared library, built as C++17).

claude take

The same declarations are unchanged on current master (d2d245b) and in LTS 20260817.0 and 20250814.0, so I expect them to be affected too, but I have only reproduced this with 20260526.0.

What operating system and version are you using?

Windows (GitHub Actions hosted Windows runner, x64). I did not find the exact image version in the log.

What compiler and version are you using?

NVCC from CUDA 13.4 (cuda-nvcc 13.4.92) with MSVC as host compiler (vs2022_win-64 19.44.35207, VC runtime 14.51.36247). The failing translation units are compiled with -std=c++20.

What build system are you using?

CMake 3.31.8 with Ninja 1.13.2. Abseil is found as an installed package (find_package(absl)), not built in-tree; the consumer defines ABSL_CONSUME_DLL.

Additional context

No response

we worked around this by patching it ourselves conda-forge/abseil-cpp-feedstock#117

maybe related #2075

@hmaarrfk

Thanks for opening @hmaarrfk!

we worked around this by patching it ourselves conda-forge/abseil-cpp-feedstock#117

To help readers, the patch in question is quite minimal

diff --git a/absl/hash/hash.h b/absl/hash/hash.h
index 7a76771..2e09896 100644
--- a/absl/hash/hash.h
+++ b/absl/hash/hash.h
@@ -367,7 +367,7 @@ class HashState : public hash_internal::HashStateBase<HashState> {
  private:
   HashState() = default;
 
-  friend class HashState::HashStateBase;
+  friend class hash_internal::HashStateBase<HashState>;
   friend struct hash_internal::CombineRaw;
 
   template <typename T>
diff --git a/absl/hash/internal/hash.h b/absl/hash/internal/hash.h
index 9463746..b139397 100644
--- a/absl/hash/internal/hash.h
+++ b/absl/hash/internal/hash.h
@@ -1475,7 +1475,7 @@ class ABSL_DLL MixingHashState : public HashStateBase<MixingHashState> {
   }
 
  private:
-  friend class MixingHashState::HashStateBase;
+  friend class HashStateBase<MixingHashState>;
   template <typename H>
   friend H absl::hash_internal::hash_weakly_mixed_integer(H,
                                                           WeaklyMixedInteger);

Windows (GitHub Actions hosted Windows runner, x64). I did not find the exact image version in the log.

FWIW, it's contained not in the main build logs, but in the logs of the very first step in GHA logs

@h-vetinari

Thank you @h-vetinari for the improvement in terms of wholistic context!

We may need more patches even

still a draft, but xref: conda-forge/abseil-cpp-feedstock#118

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HashState::HashStateBase doesn't resolve in MSVC + Cuda 13.4 #2185

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HashState::HashStateBase doesn't resolve in MSVC + Cuda 13.4 #2185

Description

Describe the issue

Steps to reproduce the problem

What version of Abseil are you using?

What operating system and version are you using?

What compiler and version are you using?

What build system are you using?

Additional context

Activity

hmaarrfk commented on Oct 5, 2026

hmaarrfk commented on Oct 5, 2026

h-vetinari commented on Oct 6, 2026

hmaarrfk commented on Oct 6, 2026

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