The Consensus Cleanup soft fork proposal includes enforcing that coinbase transactions set their
locktime field to the block height, minus 1 (as well as their nSequence such as to not disable the
timelock). If such a fork were to be activated by Bitcoin users, miners need to be ready to produce
compliant blocks at the risk of losing substantial amounts mining would-be invalid blocks. As miners
are unfamously slow to upgrade, it's good to make this change as early as possible.
Although Bitcoin Core's GBT implementation does not provide the "coinbasetxn" field, and mining
pool software crafts the coinbase on its own, updating the Bitcoin Core mining code is a first step
toward convincing pools to update their (often closed source) code. A possible followup is also to
introduce new fields to GBT. In addition, this first step also makes it possible to test future
Consensus Cleanup changes.
The changes to the seemingly-unrelated RBF tests is because these tests assert an error message
which may vary depending on the txid of the transactions used in the test. This commit changes the
coinbase transaction structure and therefore impact the txid of transactions in all tests.
The change to the "Bad snapshot" error message in the assumeutxo functional test is because this
specific test case reads into the txid of the next transaction in the snapshot and asserts the error
message based it gets on deserializing this txid as a coin for the previous transaction. As this
commit changes this txid it impacts the deserialization error raised.
A bug in 0.21.x and 22.x resulted in some wallets having invalid
derivation paths that are the concatenation of two derivation paths.
These appear only when inactive hd chains are topped up.
Since key metadata is a legacy wallet only record, migrating legacy
wallets to descriptor wallets will fix this issue as all key metadata
records are deleted. The derivation path information is derived
on-the-fly from the descriptor that is produced for the inactive hd
chain.
Thus we only need a test to verify that the derivation paths are good,
and that all key metadata records are deleted from the migrated wallet.
Legacy wallets do not have the descriptors flag set. Don't load wallets
without the descriptors flag.
At the same time, we will no longer load BDB databases since they are
only used for legacy wallets.
Removes all legacy wallet specific functional tests.
Also removes the --descriptor and --legacy-wallet options as these are
no longer necessary with the legacy wallet removed.
* do not only check user provided range data to decide whether descriptor is ranged
* properly handle std::optional<bool> when checking if descriptor is internal
fa86190e6ed2aeda7bcceaf96f52403816bcd751 rpc: Allow fullrbf fee bump (MarcoFalke)
Pull request description:
The RPCs (psbt)bumpfee, and the GUI, reject fee bumps when BIP 125 signalling is absent in the transaction even when the mempool and other RPCs allow them. Fix the confusion by allowing the fee bump.
This is done after fullrbf is always on (https://github.com/bitcoin/bitcoin/pull/30592)
ACKs for top commit:
1440000bytes:
reACK fa86190e6e
achow101:
ACK fa86190e6ed2aeda7bcceaf96f52403816bcd751
w0xlt:
ACK fa86190e6e
rkrux:
reACK fa86190e6ed2aeda7bcceaf96f52403816bcd751
glozow:
ACK fa86190e6ed2aeda7bcceaf96f52403816bcd751
Tree-SHA512: b2ffe8dcadbe71e9be767a16cf8aa0bf383c2de7aa1aee9438d125f444e24f3f7e4f02ddb28981bd3b8b645b6a24a407b4ad6bb0b21946ae637e78f6386e05bf
Observed on local machine running Windows / Python v3.13.1 when overriding rpc_timeout to small values (5- seconds). Next commit performs such overrides.
After fixing the nTime variable name, the test_pruneheight_undo_presence
test began failing because node 2, which is involved in reorg testing,
could be on a different chain than other nodes. This caused failures
when trying to fetch blocks from other nodes that didn't recognize
node 2's chain.
Switch to using node 5 instead, which is also a pruned node but isn't
involved in reorg testing, ensuring it stays on the same chain as the
other nodes. This allows the block fetching to work as intended in the
test.
Fix incorrect variable name in comment (nTimes -> nTime) in
feature_pruning.py. This typo caused the test to always reset
mine_large_blocks.nTime to 0, rather than only on the first run
as intended.
(Still tolerate calling it on a no longer (self.)running node, as in a node that has been queried for is_node_stopped() and modified state before returning True).
Tests should not attempt to use the non-functioning RPC interface to call stop() unless wait_for_connections() has succeeded.
No longer log and suppress http.client.CannotSendRequest as a consequence of stop()-RPC, as error conditions causing this knock-on issue are now guarded against before the call.
When an RPC connection attempt with bitcoind times out, include which ignored errors occurred in the exception message.
May provide clues of what has gone wrong.
ConnectionResetError is an OSError as well (ECONNRESET), no reason to have a separate except-block for it.
Also improves comments for other exceptions and make condition above more Pythonic.
e261eb8d50c7192260a449e653453e63f59dbeed tests: Add BIP 373 test vectors (Ava Chow)
26370c68d09ddd6c8d24ef3b62e7b87a09e6dcaa rpc: Include MuSig2 fields in decodepsbt (Ava Chow)
ff3d460898489d2c509492a9a11b1a336e6ec662 psbt: Implement un/ser of musig2 fields (Ava Chow)
Pull request description:
Implements un/serialization of MuSig2 PSBT fields and prepares PSBT to be able to sign for MuSig2 inputs.
Split from #29675
ACKs for top commit:
fjahr:
re-ACK e261eb8d50c7192260a449e653453e63f59dbeed
theStack:
re-ACK e261eb8d50c7192260a449e653453e63f59dbeed
rkrux:
tACK e261eb8d50c7192260a449e653453e63f59dbeed
Tree-SHA512: bb852ad074978847ac4dc656332025e2d4d1025d4283537b89618c7cadd61a8ecd2eff24779b8a014bc8d7b431125060449768192fa05ad0577f29e3c64b2374
fa6a007b8e7b68d559b30c04dd8d76c877bef133 fuzz: Avoid integer sanitizer warnings in policy_estimator target (MarcoFalke)
Pull request description:
It seems odd to write a fuzz target to trigger integer sanitizer warnings in `CBlockPolicyEstimator::processBlockTx` and then suppress them. If the scenario can happen in reality, the code should be properly fixed to handle the cases. If not, it seems better to fix the fuzz target to not trigger meaningless traces.
Do that here by keeping track of the current height and limiting mempool entries to at most this entry height.
ACKs for top commit:
brunoerg:
ACK fa6a007b8e7b68d559b30c04dd8d76c877bef133
dergoegge:
utACK fa6a007b8e7b68d559b30c04dd8d76c877bef133
Tree-SHA512: 2092017dc309fb095fe5d43cfb76efb691795f303d567ee919be2b5cac19a944293636229903dc4d1e8b9fe5daf9dc3058544321eff1735f91f804c3baa36cd0
Also, fix the incorrect documention of the 'replaceable' RPC argument
with respect to sequence number handling. The docs were incorrect
before, so the fix could be extracted, but it seems fine to include here
as well.
2929da1dd592da79e0afa6834a82c1bc54fbcf18 test: Add coverage for rpcwhitelistdefault when unset (naiyoma)
535b8747074c368fc8f9931c37a8109d35136885 test: Combine rpcwhitelistdefault functions (naiyoma)
2b6ce9254da5fe3dcd7b6ae212b6276c01d15c71 test: Update permissions and string formatting (naiyoma)
Pull request description:
This is a follow-up PR to address review feedback from [https://github.com/bitcoin/bitcoin/pull/29858](https://github.com/bitcoin/bitcoin/pull/29858)
- [x] add case where rpcwhitelistdefault setting is [unset](https://github.com/bitcoin/bitcoin/pull/29858#pullrequestreview-2532726241)
- [x] Code [cleanup](https://github.com/bitcoin/bitcoin/pull/29858#discussion_r1927238617) , change password and f-string formatting
- [x] [Combine](https://github.com/bitcoin/bitcoin/pull/29858#discussion_r1930137601) rpcwhitelistdefault tests into `test_rpcwhitelistdefault_permissions`
I am not sure if my approach of adding` test_rpcwhitelistdefault_unset` is better or if I should just include the assertions in the existing `test_rpcwhitelistdefault_permissions`
ACKs for top commit:
w0xlt:
Code review ACK 2929da1dd5
achow101:
ACK 2929da1dd592da79e0afa6834a82c1bc54fbcf18
ryanofsky:
Code review ACK 2929da1dd592da79e0afa6834a82c1bc54fbcf18. Only change since last review was simplifying the last commit as suggested
Tree-SHA512: 6750dd3e6abaca3a09ad1fd5d07c64767bc59188ff953cbc26aa7796071774cb92745ac82cf91e479632d682fd450bc00d53032454b65b22654a3e770ec68e89
babb9f5db64145a4adec07dee1c8328195363777 depends: remove non-native libmultiprocess build (Cory Fields)
5d105fb8c3ffa39c3e716c3147ee74795b129113 depends: Switch libmultiprocess packages to use local git subtree (Ryan Ofsky)
9b35518d2f3ff67cbc87d30bd3b882fe72fd5d87 depends, moveonly: split up int_get_build_id function (Ryan Ofsky)
2d373e27071f54e04f8aaf6753e5481ccbc9ed3f lint: Add exclusions for libmultiprocess subtree (Ryan Ofsky)
e88ab394c163a8ebe59ee240b09430d788ef274e doc: Update documentation to explain libmultiprocess subtree (Ryan Ofsky)
d4bc5639829f0c98bd2faeddba9be4e8c6667875 cmake: Fix clang-tidy "no input files" errors (Ryan Ofsky)
abdf3cb6456f3f79b3130d2001bf780deadccf87 cmake: Fix warnings from boost headers (Ryan Ofsky)
8532fcb1c30d6556c273bd77a2a7daa6b0a2448d cmake: Fix ctest mptest "Unable to find executable" errors (Ryan Ofsky)
d597ab1dee6b3541c827e6be61fc8a9b61d1e23d cmake: Support building with libmultiprocess subtree (Ryan Ofsky)
69f0d4adb72c1dc5c261517899d87b0fe8b88304 scripted-diff: s/WITH_MULTIPROCESS/ENABLE_IPC/ in cmake (Ryan Ofsky)
a2f28e4be96e92079a219567cf20214996aefc53 Squashed 'src/ipc/libmultiprocess/' content from commit 35944ffd23fa (Ryan Ofsky)
d6244f85c509d7644a57def892298a4dde988c3b depends: Update libmultiprocess library to simplify cmake subtree build (Ryan Ofsky)
Pull request description:
This adds the [libmultiprocess](https://github.com/chaincodelabs/libmultiprocess) library and code generator as a subtree in `src/ipc/libmultiprocess` and allows it to be built with the cmake `-DENABLE_IPC` option, which is disabled by default.
This PR does not entirely remove the depends system [libmultiprocess package](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/native_libmultiprocess.mk) because the package is useful when cross compiling. (A cross-compiling cmake build cannot easily build and run a native code generation tool.) However, it does update the depends package to build from the new git subtree, instead of being downloaded separately from github, so the same sources are used to build both the runtime library and the code generator.
This PR includes the following manual changes (not created automatically with `git subtree add`) which just update the build system and documentation:
- [`d6244f85c509` depends: Update libmultiprocess library to simplify cmake subtree build](d6244f85c5)
- [`69f0d4adb72c` scripted-diff: s/WITH_MULTIPROCESS/ENABLE_IPC/ in cmake](69f0d4adb7)
- [`d597ab1dee6b` cmake: Support building with libmultiprocess subtree](d597ab1dee)
- [`8532fcb1c30d` cmake: Fix ctest mptest "Unable to find executable" errors](8532fcb1c3)
- [`abdf3cb6456f` cmake: Fix warnings from boost headers](abdf3cb645)
- [`d4bc5639829f` cmake: Fix clang-tidy "no input files" errors](d4bc563982)
- [`e88ab394c163` doc: Update documentation to explain libmultiprocess subtree](e88ab394c1)
- [`2d373e27071f` lint: Add exclusions for libmultiprocess subtree](2d373e2707)
- [`9b35518d2f3f` depends, moveonly: split up int_get_build_id function](9b35518d2f)
- [`5d105fb8c3ff` depends: Switch libmultiprocess packages to use local git subtree](5d105fb8c3)
- [`babb9f5db641` depends: remove non-native libmultiprocess build](babb9f5db6)
---
Previous minisketch subtree PR #23114 may be useful for comparison
Instructions for subtree verification can be found:
- https://github.com/bitcoin/bitcoin/blob/master/doc/developer-notes.md#subtrees
- https://github.com/bitcoin/bitcoin/tree/master/test/lint#git-subtree-checksh
TL&DR:
```sh
git remote add --fetch libmultiprocess https://github.com/chaincodelabs/libmultiprocess.git
test/lint/git-subtree-check.sh -r src/ipc/libmultiprocess
```
---
This PR is part of the [process separation project](https://github.com/bitcoin/bitcoin/issues/28722).
ACKs for top commit:
Sjors:
re-ACK babb9f5db64145a4adec07dee1c8328195363777
TheCharlatan:
tACK babb9f5db64145a4adec07dee1c8328195363777
vasild:
ACK babb9f5db64145a4adec07dee1c8328195363777
Tree-SHA512: 43d4eecca5aab63e55c613de935965666eaced327f9fe859a0e9c9b85f7685dc16c5c8d6e03e09ca998628c5d468633f4f743529930b037049abe8e0101e0143
fac978fb213fbd6668194d8b9810ddd10f8a7323 test: Remove fragile and ancient release 0.17 wallet test (MarcoFalke)
Pull request description:
The test checks that the 0.17 wallet rejects wallet files created in "the future".
This is nice, and good to know. However,
* The 0.17 release is ancient and should be unused outside of tests, especially to load future wallets.
* The test intermittently fails, due to ancient RPC server bugs, that were fixed in the meantime. [1]
* Albeit they are not identical, the 0.18 release is still checked in this test, so any theoretical bug that would be caught by 0.17 is hopefully still caught by 0.18 as well.
So fix all issues by removing the test case.
[1] For example from https://api.cirrus-ci.com/v1/task/6161588714995712/logs/ci.log:
```
190/321 - [1mwallet_backwards_compatibility.py --descriptors[0m failed, Duration: 23 s
[17:21:40.700]
[17:21:40.700] [1mstdout:
[17:21:40.700] [0m2025-04-02T21:21:16.575000Z TestFramework (INFO): PRNG seed is: 5772716217847090743
[17:21:40.700] 2025-04-02T21:21:16.580000Z TestFramework (INFO): Initializing test directory /ci_container_base/ci/scratch/test_runner/test_runner_₿_🏃_20250402_210134/wallet_backwards_compatibility_134
[17:21:40.700] 2025-04-02T21:21:26.378000Z TestFramework (INFO): Test wallet backwards compatibility...
[17:21:40.700] 2025-04-02T21:21:33.191000Z TestFramework (INFO): Testing 0.19 addmultisigaddress case (#18075)
[17:21:40.700] 2025-04-02T21:21:33.637000Z TestFramework (INFO): Test that a wallet made on master can be opened on:
[17:21:40.700] 2025-04-02T21:21:33.637000Z TestFramework (INFO): - 250000
[17:21:40.700] 2025-04-02T21:21:34.055000Z TestFramework (INFO): - 240001
[17:21:40.700] 2025-04-02T21:21:34.435000Z TestFramework (INFO): - 230000
[17:21:40.700] 2025-04-02T21:21:34.858000Z TestFramework (INFO): - 220000
[17:21:40.700] 2025-04-02T21:21:35.614000Z TestFramework (INFO): - 210000
[17:21:40.700] 2025-04-02T21:21:35.707000Z TestFramework (INFO): Test descriptor wallet incompatibility on:
[17:21:40.700] 2025-04-02T21:21:35.707000Z TestFramework (INFO): - 200100
[17:21:40.700] 2025-04-02T21:21:35.878000Z TestFramework (INFO): - 190100
[17:21:40.700] 2025-04-02T21:21:36.021000Z TestFramework (INFO): - 180100
[17:21:40.700] 2025-04-02T21:21:36.319000Z TestFramework (INFO): Test descriptor wallet incompatibility with 0.17
[17:21:40.700] 2025-04-02T21:21:37.328000Z TestFramework (INFO): Test that 0.21 cannot open wallet containing tr() descriptors
[17:21:40.700] 2025-04-02T21:21:37.356000Z TestFramework (INFO): Test that a wallet can upgrade to and downgrade from master, from:
[17:21:40.700] 2025-04-02T21:21:37.361000Z TestFramework (INFO): - 250000
[17:21:40.700] 2025-04-02T21:21:37.665000Z TestFramework (INFO): - 240001
[17:21:40.700] 2025-04-02T21:21:37.970000Z TestFramework (INFO): - 230000
[17:21:40.700] 2025-04-02T21:21:38.439000Z TestFramework (INFO): - 220000
[17:21:40.700] 2025-04-02T21:21:38.793000Z TestFramework (INFO): - 210000
[17:21:40.700] 2025-04-02T21:21:39.470000Z TestFramework (INFO): Stopping nodes
[17:21:40.700]
[17:21:40.700]
[17:21:40.700] [1mstderr:
[17:21:40.700] [0mTraceback (most recent call last):
[17:21:40.700] File "/ci_container_base/ci/scratch/build-x86_64-pc-linux-gnu/test/functional/wallet_backwards_compatibility.py", line 389, in <module>
[17:21:40.700] BackwardsCompatibilityTest(__file__).main()
[17:21:40.700] File "/ci_container_base/test/functional/test_framework/test_framework.py", line 206, in main
[17:21:40.700] exit_code = self.shutdown()
[17:21:40.700] File "/ci_container_base/test/functional/test_framework/test_framework.py", line 379, in shutdown
[17:21:40.700] self.stop_nodes()
[17:21:40.700] File "/ci_container_base/test/functional/test_framework/test_framework.py", line 643, in stop_nodes
[17:21:40.700] node.stop_node(wait=wait, wait_until_stopped=False)
[17:21:40.700] File "/ci_container_base/test/functional/test_framework/test_node.py", line 397, in stop_node
[17:21:40.700] self.stop()
[17:21:40.700] File "/ci_container_base/test/functional/test_framework/coverage.py", line 50, in __call__
[17:21:40.700] return_val = self.auth_service_proxy_instance.__call__(*args, **kwargs)
[17:21:40.700] File "/ci_container_base/test/functional/test_framework/authproxy.py", line 132, in __call__
[17:21:40.700] response, status = self._request('POST', self.__url.path, postdata.encode('utf-8'))
[17:21:40.700] File "/ci_container_base/test/functional/test_framework/authproxy.py", line 106, in _request
[17:21:40.700] return self._get_response()
[17:21:40.700] File "/ci_container_base/test/functional/test_framework/authproxy.py", line 169, in _get_response
[17:21:40.700] http_response = self.__conn.getresponse()
[17:21:40.700] File "/usr/lib/python3.10/http/client.py", line 1375, in getresponse
[17:21:40.700] response.begin()
[17:21:40.700] File "/usr/lib/python3.10/http/client.py", line 318, in begin
[17:21:40.700] version, status, reason = self._read_status()
[17:21:40.700] File "/usr/lib/python3.10/http/client.py", line 287, in _read_status
[17:21:40.700] raise RemoteDisconnected("Remote end closed connection without"
[17:21:40.700] http.client.RemoteDisconnected: Remote end closed connection without response
[17:21:40.700] [node 10] Cleaning up leftover process
[17:21:40.700] [node 9] Cleaning up leftover process
[17:21:40.700] [node 8] Cleaning up leftover process
[17:21:40.700] [node 7] Cleaning up leftover process
[17:21:40.700] [node 6] Cleaning up leftover process
[17:21:40.700] [node 5] Cleaning up leftover process
[17:21:40.700] [node 4] Cleaning up leftover process
[17:21:40.700] [node 3] Cleaning up leftover process
[17:21:40.700] [node 2] Cleaning up leftover process
[17:21:40.700] [node 1] Cleaning up leftover process
[17:21:40.700] [node 0] Cleaning up leftover process
ACKs for top commit:
laanwj:
Code review ACK fac978fb213fbd6668194d8b9810ddd10f8a7323
janb84:
Re ACK [fac978f](fac978fb21)
pablomartin4btc:
re ACK fac978fb213fbd6668194d8b9810ddd10f8a7323
BrandonOdiwuor:
Code Review ACK fac978fb213fbd6668194d8b9810ddd10f8a7323
Tree-SHA512: 13acdfc6be4293a0ff45ae20b26ba60636e130097da380b7b51716faaa950320462399bef55e74b3cedc82944586dcc1bfd078babb96edb03c4efdb8f40af5a4
459807d566cfddad12b2953a506fd07a129145d8 test: remove strict restrictions on rpc_deprecated (Pol Espinasa)
Pull request description:
Removed the wallet restrictions for `rpc_deprecated.py` and added specific test case for the current deprecated rpc.
`skip_test_if_missing_module` will skip the whole test when the wallet is missing, even if a part of the test is non-wallet related. This PR ensures that other tests not related to wallet can be ran and only this specific test will be skipped if there's no wallet
For more context check https://github.com/bitcoin/bitcoin/pull/31278#discussion_r2011661090
ACKs for top commit:
maflcko:
lgtm ACK 459807d566cfddad12b2953a506fd07a129145d8
rkrux:
ACK 459807d
Tree-SHA512: 922b0fafe8fb5bd88a677ce8be5c3fe2fdd4d0aadcd32cc11738a714cd6f765f07e7e7158c829f8338db0d46a15c030437a1ea09a3187c072bebebb4ca53ad85
f974359e218edc3f31685015e234d00243a79452 test: Add encodable PUSHDATA1 examples to feature_taproot (Greg Sanders)
Pull request description:
Inspired by discussion in https://github.com/bitcoin/bitcoin/pull/31640#issuecomment-2743492906 I made an example adding coverage I think is missing, with some extra commentary that might help future contributors (including myself when I forget how it works again).
Open for suggestions how we can make it more welcoming beyond this.
cc darosior EthanHeilman sipa
ACKs for top commit:
janb84:
Re-ACK [f974359](f974359e21)
rkrux:
ACK f974359e218edc3f31685015e234d00243a79452
Tree-SHA512: 7544d41c39c13d245a8a33522e53f22b4dd7593c069631978303e5a349cd12cf9d45bed648c391618c4732831232c4b82b8de2bf6cba5bf5e1232501db926122
c5a7ffd1e8ccae12e034face4293bc8d5a6556b7 preserve llvm profile env (Prabhat Verma)
Pull request description:
While generating `profraw` for fuzz tests using steps in [PR 32206](https://github.com/bitcoin/bitcoin/pull/32206) , the profraw was not being built at the desired location and only one `default.profraw` was being created which was being overwritten for multiple fuzz targets. This PR fixes that.
ACKs for top commit:
maflcko:
lgtm ACK c5a7ffd1e8ccae12e034face4293bc8d5a6556b7
mabu44:
ACK c5a7ffd1e8ccae12e034face4293bc8d5a6556b7
Tree-SHA512: 11f74caa8cba6f841aa899a5e294f658aed1b6a3d4cf68992609ea99fadb4a092b2350ffacea5c2d5eb377eb10082de018f27a1d6486a72460cb3905aaa15664
f00345727b8d2bf73409db5cd342e476671e6425 doc: Update `dependencies.md` for Qt 6 (Hennadii Stepanov)
80b917991ed7ff931f0a9211cebf859f674776c4 build, msvc: Update `vcpkg.json` for Qt 6 (Hennadii Stepanov)
30dd1f1644e0441b5310f1eceecfd6a5abc45f68 ci: Update for Qt 6 (Hennadii Stepanov)
629d292f4d846978c682c5f497240c62d62f4bd1 test: Update sanitizer suppressions for Qt 6 (Hennadii Stepanov)
551e13abf82522bad7fdde4ff4bd15d2c8f88b23 guix: Adjust for Qt 6 (Hennadii Stepanov)
c3e9bd086c498e9f1cbdc505949cb17ac1b39f7e qt: Fix compiling for Windows (Hennadii Stepanov)
ab399c4db2e98aee8e01323c4c6cca48b520dc7f depends: Add `native_qt` package (Hennadii Stepanov)
248613eb3ee034bf143821a51635e697dc114e6c depends: Factor out Qt modules' details (Hennadii Stepanov)
0268f52a4cd2b7aa63934526437bcf6912e47d3c depends: Introduce customizable `$(package)_patches_path` variables (Hennadii Stepanov)
5e794e62024eef612e1fbb71c76ea54d17435c14 depends: Bump `qt` package up to 6.7.3 (Hennadii Stepanov)
6d4214925fadc36d26aa58903db5788c742e68c6 cmake: Require Qt 6 to build GUI (Hennadii Stepanov)
Pull request description:
The currently used Qt 5.15 is approaching [EOL](https://www.qt.io/blog/qt-5.15-extended-support-for-subscription-license-holders) and will reach it before the Bitcoin Core v30 release. The recent migration of the build system to CMake makes it possible to switch to Qt 6.
This PR updates the OS runtime compatibility requirements for the Bitcoin Core GUI as follows:
### 1. Linux
Starting with Qt 6.5.0, the `libxcb-cursor0` package is required to be installed at runtime.
### 2. Windows
Cross-compiling does not support LTO. We have to re-add it in a follow-up.
A new style plugin causes minor visual glitches, such as
which will be fixed in follow-ups.
### 3. macOS
`bitcoin-qt` now uses the [Metal](https://developer.apple.com/metal/) backend.
---
**IMPORTANT.** Don't forget to install [Ninja](https://ninja-build.org/).
---
For historical context, please refer to:
- https://github.com/bitcoin/bitcoin/issues/20627
- https://github.com/bitcoin/bitcoin/pull/24798
---
UPD 2024-10-09. Qt 6.8 has been [released](https://www.qt.io/blog/qt-6.8-released), but it has some [drawbacks](https://github.com/bitcoin/bitcoin/pull/30997#issuecomment-2402990346) for us. As a result, this PR will stick to Qt 6.7.
UPD 2025-03-18: [Standard support for Qt 5.15 will end after 26th of May 2025](https://www.qt.io/blog/extended-security-maintenance-for-qt-5.15-begins-may-2025)
ACKs for top commit:
laanwj:
re-ACK f00345727b8d2bf73409db5cd342e476671e6425
hodlinator:
re-ACK f00345727b8d2bf73409db5cd342e476671e6425
Tree-SHA512: 367f722e6c3ea4700b5395871c40b6df8c8062fdc822107090449ea4ae4ad2db75cc53a982a678f4c48ce8f9b2d43ed10e6d23b06165ab78713f161db712d895
Without this change linter produces errors about:
- Use of std::filesystem the libmultiprocess example program.
- Use of locale-dependent functions in example program, in the build time code
generator, and in the runtime library for debug logging.
- Include guards not beginning with BITCOIN_
