backport: bitcoin#30633 by knst · Pull Request #7392 · dashpay/dash

knst · 2026-06-29T18:24:54Z

Issue being fixed or feature implemented

Dash Core is failed to get compiled with warnings enabled on gcc-16

What was done?

Backport bitcoin#30633

How Has This Been Tested?

Build passes these relevant errors

Breaking Changes

N/A

Checklist:

I have performed a self-review of my own code
I have commented my code, particularly in hard-to-understand areas
I have added or updated relevant unit/integration/functional/e2e tests
I have made corresponding changes to the documentation
I have assigned this pull request to a milestone

055bc05 policy/feerate.h: avoid constraint self-dependency (Matt Whitlock) 138f867 add missing #include <cstdint> for GCC 15 (Matt Whitlock) Pull request description: bitcoin#30612 with changes made. GCC 15 introduces three build failures: * Two are related to missing includes. You can't use `uint16_t` et al. without including `<cstdint>`. * The third is harder to understand but easy to fix. GCC changed something about the way templates are instantiated when checking type constraints, and now there is a dependency loop while checking `std::optional<CFeeRate>`. This manifests as the following compile-time mess: ``` In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/format:48, from /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/chrono_io.h:39, from /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/chrono:3362, from ./util/time.h:9, from ./primitives/block.h:12, from ./blockencodings.h:8, from blockencodings.cpp:5: /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/type_traits: In substitution of 'template<class _Up> requires !(is_same_v<std::optional<_Tp>, typename std::remove_cvref<_It2>::type>) && (is_constructible_v<_Tp, const _Up&>) && (__construct_from_contained_value<_Up, typename std::remove_cv< <template-parameter-1-1> >::type>) constexpr std::optional<CFeeRate>::optional(const std::optional<_Tp>&) [with _Up = CFeeRate]': /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/type_traits:1140:25: required by substitution of 'template<class _Tp, class ... _Args> using std::__is_constructible_impl = std::__bool_constant<__is_constructible(_Tp, _Args ...)> [with _Tp = CFeeRate; _Args = {std::optional<CFeeRate>&}]' 1140 | = __bool_constant<__is_constructible(_Tp, _Args...)>; | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/type_traits:1145:12: required from 'struct std::is_constructible<CFeeRate, std::optional<CFeeRate>&>' 1145 | struct is_constructible | ^~~~~~~~~~~~~~~~ /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/type_traits:178:35: required by substitution of 'template<class ... _Bn> std::__detail::__first_t<std::integral_constant<bool, false>, typename std::enable_if<(!(bool)(_Bn::value)), void>::type ...> std::__detail::__or_fn(int) [with _Bn = {std::is_constructible<CFeeRate, std::optional<CFeeRate>&>, std::is_convertible<std::optional<CFeeRate>&, CFeeRate>, std::is_constructible<CFeeRate, std::optional<CFeeRate> >, std::is_convertible<std::optional<CFeeRate>, CFeeRate>, std::is_constructible<CFeeRate, const std::optional<CFeeRate>&>, std::is_convertible<const std::optional<CFeeRate>&, CFeeRate>, std::is_constructible<CFeeRate, const std::optional<CFeeRate> >, std::is_convertible<const std::optional<CFeeRate>, CFeeRate>}]' 178 | __enable_if_t<!bool(_Bn::value)>...>; | ^~~~~ /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/type_traits:196:41: required from 'struct std::__or_<std::is_constructible<CFeeRate, std::optional<CFeeRate>&>, std::is_convertible<std::optional<CFeeRate>&, CFeeRate>, std::is_constructible<CFeeRate, std::optional<CFeeRate> >, std::is_convertible<std::optional<CFeeRate>, CFeeRate>, std::is_constructible<CFeeRate, const std::optional<CFeeRate>&>, std::is_convertible<const std::optional<CFeeRate>&, CFeeRate>, std::is_constructible<CFeeRate, const std::optional<CFeeRate> >, std::is_convertible<const std::optional<CFeeRate>, CFeeRate> >' 196 | : decltype(__detail::__or_fn<_Bn...>(0)) | ~~~~~~~~~~~~~~~~~~~~~~~~~^~~ /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/optional:824:45: required from 'constexpr const bool std::optional<CFeeRate>::__construct_from_contained_value<CFeeRate, CFeeRate>' 824 | = !__converts_from_optional<_Tp, _From>::value; | ^~~~~ /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/optional:884:7: required by substitution of 'template<class _Up> requires !(is_same_v<std::optional<_Tp>, typename std::remove_cvref<_It2>::type>) && (is_constructible_v<_Tp, const _Up&>) && (__construct_from_contained_value<_Up, typename std::remove_cv< <template-parameter-1-1> >::type>) constexpr std::optional<CFeeRate>::optional(const std::optional<_Tp>&) [with _Up = CFeeRate]' 884 | && __construct_from_contained_value<_Up> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ./validation.h:164:41: required from here 164 | return MempoolAcceptResult(state); | ^ /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/optional:886:2: required by the constraints of 'template<class _Tp> template<class _Up> requires !(is_same_v<std::optional<_Tp>, typename std::remove_cvref<_It2>::type>) && (is_constructible_v<_Tp, const _Up&>) && (__construct_from_contained_value<_Up, typename std::remove_cv< <template-parameter-1-1> >::type>) constexpr std::optional<_Tp>::optional(const std::optional<_From>&)' /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/optional:884:14: error: satisfaction of atomic constraint '__construct_from_contained_value<_Up, typename std::remove_cv< <template-parameter-1-1> >::type> [with _Tp = _Tp; _Up = _Up]' depends on itself 884 | && __construct_from_contained_value<_Up> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ``` It is easiest to solve this by changing the `static_assert` in the explicit `CFeeRate` constructor to a SFINAE by using a type constraint on the function template parameter. We already [downstreamed](gentoo/gentoo#38015) these fixes in Gentoo. ACKs for top commit: stickies-v: ACK 055bc05 Tree-SHA512: ce9cb27bcd9b0f4bbc80951e45cf7127112dcb7f9937bcb0167b362026d35beecb1255354746de0aac82e03c41eaccbe26acbfe0ddff2ee1e5a8634673f4f4ba

github-actions · 2026-06-29T18:25:25Z

✅ No Merge Conflicts Detected

This PR currently has no conflicts with other open PRs.

thepastaclaw · 2026-06-29T18:27:05Z

✅ Review complete (commit c93513b)

coderabbitai · 2026-06-29T18:27:16Z

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 55d39a87-220c-4ef4-8fef-685ce7bd7d0f

📥 Commits

Reviewing files that changed from the base of the PR and between cdcf00a and c93513b.

📒 Files selected for processing (4)

src/chainparamsbase.h
src/evo/chainhelper.h
src/node/interface_ui.h
src/policy/feerate.h

Walkthrough

Three headers receive missing standard library includes: <cstdint> is added to src/chainparamsbase.h and src/evo/chainhelper.h; src/node/interface_ui.h gains <cstdint> and <vector> while dropping <memory>. In src/policy/feerate.h, CFeeRate's templated constructor replaces an unconstrained template<typename I> plus internal static_assert with template<std::integral I>, making the integral constraint part of the template signature.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title identifies the changeset as a backport of bitcoin#30633, which matches the actual code changes.
Description check	✅ Passed	The description is directly related to the PR and correctly states the GCC build-fix backport.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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🧪 Generate unit tests (beta)

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thepastaclaw

Code Review

Verified PR #7392 at c93513b against the local diff, patch artifact, checked-out source, and locally available upstream Bitcoin Core commits. The shared backport hunks match bitcoin#30633, the Dash-only evo include is justified by fixed-width integer use in that header, and syntax-only header checks passed for all changed files. No actionable CodeRabbit inline findings were provided.

UdjinM6

utACK c93513b

75b19b3 fix: compilation error with modern gcc for leveldb subtree (Konstantin Akimov) Pull request description: ## Issue being fixed or feature implemented Dash Core's build fails with gcc-16: In copy constructor 'constexpr leveldb::DBImpl::CompactionState::Output::Output(const leveldb::DBImpl::CompactionState::Output&)', inlined from 'constexpr _Tp* std::construct_at(_Tp*, _Args&& ...) [with _Tp = leveldb::DBImpl::CompactionState::Output; _Args = {const leveldb::DBImpl::CompactionState::Output&}]' at /usr/include/c++/16/bits/stl_construct.h:110:9, inlined from 'static constexpr void std::allocator_traits<std::allocator<_Up> >::construct(allocator_type&, _Up*, _Args&& ...) [with _Up = leveldb::DBImpl::CompactionState::Output; _Args = {const leveldb::DBImpl::CompactionState::Output&}; _Tp = leveldb::DBImpl::CompactionState::Output]' at /usr/include/c++/16/bits/alloc_traits.h:716:21, inlined from 'constexpr void std::vector<_Tp, _Alloc>::_M_realloc_append(_Args&& ...) [with _Args = {const leveldb::DBImpl::CompactionState::Output&}; _Tp = leveldb::DBImpl::CompactionState::Output; _Alloc = std::allocator<leveldb::DBImpl::CompactionState::Output>]' at /usr/include/c++/16/bits/vector.tcc:594:26, inlined from 'constexpr void std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = leveldb::DBImpl::CompactionState::Output; _Alloc = std::allocator<leveldb::DBImpl::CompactionState::Output>]' at /usr/include/c++/16/bits/stl_vector.h:1417:21, inlined from 'leveldb::Status leveldb::DBImpl::OpenCompactionOutputFile(CompactionState*)' at leveldb/db/db_impl.cc:808:31: leveldb/db/db_impl.cc:57:10: error: 'out.leveldb::DBImpl::CompactionState::Output::file_size' may be used uninitialized [-Werror=maybe-uninitialized] 57 | struct Output { | ^~~~~~ leveldb/db/db_impl.cc: In member function 'leveldb::Status leveldb::DBImpl::OpenCompactionOutputFile(CompactionState*)': leveldb/db/db_impl.cc:804:29: note: 'out' declared here 804 | CompactionState::Output out; ## What was done? Original leveldb's commit is ad9b1c989380538bfb19c5c65df0d3f72d8ed62b Backported to Bitcoin Core by bitcoin#34470 Though, that too many unrelated changes meanwhile. That's temporary fix until leveldb's version won't be properly updated. ## How Has This Been Tested? Together with #7392 I finally compile dash core with gcc 16 again. ## Breaking Changes N/A ## Checklist: - [x] I have performed a self-review of my own code - [ ] I have commented my code, particularly in hard-to-understand areas - [ ] I have added or updated relevant unit/integration/functional/e2e tests - [ ] I have made corresponding changes to the documentation - [x] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_ ACKs for top commit: UdjinM6: utACK 75b19b3 Tree-SHA512: 985042f04a4df7b20aaa773d302401af948099ae8c29d6669f0441e654b9c8847942e75574c52d1652411e321b80b1861f93c163792636d1246bea9edc99c249

c93513b Merge bitcoin#30633: Fixes for GCC 15 compatibility (merge-script) Pull request description: ## Issue being fixed or feature implemented Dash Core is failed to get compiled with warnings enabled on gcc-16 ## What was done? Backport bitcoin#30633 ## How Has This Been Tested? Build passes _these_ relevant errors ## Breaking Changes N/A ## Checklist: - [x] I have performed a self-review of my own code - [ ] I have commented my code, particularly in hard-to-understand areas - [ ] I have added or updated relevant unit/integration/functional/e2e tests - [ ] I have made corresponding changes to the documentation - [x] I have assigned this pull request to a milestone ACKs for top commit: UdjinM6: utACK c93513b Tree-SHA512: c9b5537ff911b7fbc3eacd0517e7c67ccac907ce2d6983a1671c3a28196e460234d87e4b947536b71b310b44a1cbeb0341c3dc36c3bc6b98075c41de58b92238

…b subtree 75b19b3 fix: compilation error with modern gcc for leveldb subtree (Konstantin Akimov) Pull request description: ## Issue being fixed or feature implemented Dash Core's build fails with gcc-16: In copy constructor 'constexpr leveldb::DBImpl::CompactionState::Output::Output(const leveldb::DBImpl::CompactionState::Output&)', inlined from 'constexpr _Tp* std::construct_at(_Tp*, _Args&& ...) [with _Tp = leveldb::DBImpl::CompactionState::Output; _Args = {const leveldb::DBImpl::CompactionState::Output&}]' at /usr/include/c++/16/bits/stl_construct.h:110:9, inlined from 'static constexpr void std::allocator_traits<std::allocator<_Up> >::construct(allocator_type&, _Up*, _Args&& ...) [with _Up = leveldb::DBImpl::CompactionState::Output; _Args = {const leveldb::DBImpl::CompactionState::Output&}; _Tp = leveldb::DBImpl::CompactionState::Output]' at /usr/include/c++/16/bits/alloc_traits.h:716:21, inlined from 'constexpr void std::vector<_Tp, _Alloc>::_M_realloc_append(_Args&& ...) [with _Args = {const leveldb::DBImpl::CompactionState::Output&}; _Tp = leveldb::DBImpl::CompactionState::Output; _Alloc = std::allocator<leveldb::DBImpl::CompactionState::Output>]' at /usr/include/c++/16/bits/vector.tcc:594:26, inlined from 'constexpr void std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = leveldb::DBImpl::CompactionState::Output; _Alloc = std::allocator<leveldb::DBImpl::CompactionState::Output>]' at /usr/include/c++/16/bits/stl_vector.h:1417:21, inlined from 'leveldb::Status leveldb::DBImpl::OpenCompactionOutputFile(CompactionState*)' at leveldb/db/db_impl.cc:808:31: leveldb/db/db_impl.cc:57:10: error: 'out.leveldb::DBImpl::CompactionState::Output::file_size' may be used uninitialized [-Werror=maybe-uninitialized] 57 | struct Output { | ^~~~~~ leveldb/db/db_impl.cc: In member function 'leveldb::Status leveldb::DBImpl::OpenCompactionOutputFile(CompactionState*)': leveldb/db/db_impl.cc:804:29: note: 'out' declared here 804 | CompactionState::Output out; ## What was done? Original leveldb's commit is ad9b1c989380538bfb19c5c65df0d3f72d8ed62b Backported to Bitcoin Core by bitcoin#34470 Though, that too many unrelated changes meanwhile. That's temporary fix until leveldb's version won't be properly updated. ## How Has This Been Tested? Together with dashpay#7392 I finally compile dash core with gcc 16 again. ## Breaking Changes N/A ## Checklist: - [x] I have performed a self-review of my own code - [ ] I have commented my code, particularly in hard-to-understand areas - [ ] I have added or updated relevant unit/integration/functional/e2e tests - [ ] I have made corresponding changes to the documentation - [x] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_ ACKs for top commit: UdjinM6: utACK 75b19b3 Tree-SHA512: 985042f04a4df7b20aaa773d302401af948099ae8c29d6669f0441e654b9c8847942e75574c52d1652411e321b80b1861f93c163792636d1246bea9edc99c249

knst added this to the 24 milestone Jun 29, 2026

knst added the backport-candidate-23.1.x label Jun 29, 2026

knst mentioned this pull request Jun 29, 2026

fix: compilation error with modern gcc for leveldb subtree #7393

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5 tasks

thepastaclaw approved these changes Jun 29, 2026

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knst requested review from PastaPastaPasta and UdjinM6 June 30, 2026 07:49

UdjinM6 approved these changes Jun 30, 2026

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PastaPastaPasta merged commit 6e1a0a4 into dashpay:develop Jun 30, 2026
47 checks passed

knst deleted the bp-gcc-16 branch June 30, 2026 14:52

UdjinM6 modified the milestones: 24, 23.1.7 Jun 30, 2026

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backport: bitcoin#30633#7392

backport: bitcoin#30633#7392
PastaPastaPasta merged 1 commit into
dashpay:developfrom
knst:bp-gcc-16

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❌ Failed checks (1 warning)

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knst commented Jun 29, 2026

Issue being fixed or feature implemented

What was done?

How Has This Been Tested?

Breaking Changes

Checklist:

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github-actions Bot commented Jun 29, 2026

✅ No Merge Conflicts Detected

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thepastaclaw commented Jun 29, 2026 •

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