Merge bitcoin/bitcoin#30558: [27.x] Even more backports

b06c4c6550 [WIP] doc: update release notes for 27.x (fanquake)
57de0f5e77 policy/feerate.h: avoid constraint self-dependency (Matt Whitlock)
ccff378a28 add missing #include <cstdint> for GCC 15 (Matt Whitlock)
500bba0561 test: fix constructor of msg_tx (Martin Zumsande)

Pull request description:

  Backports:
  * https://github.com/bitcoin/bitcoin/pull/30552
  * https://github.com/bitcoin/bitcoin/pull/30633

ACKs for top commit:
  stickies-v:
    ACK b06c4c6550

Tree-SHA512: 1b669d1c7e0c6c2c2a1b123970c2b5b59a417a423ee1133296ebad2ecb50e5c3889a6ae8dc640f8ae464a969b1b0287a8005a3317ee7d7252b61d96e59c131a4

doc/release-notes.md

@@ -56,9 +56,14 @@ Notable changes
 
 - #29855 psbt: Check non witness utxo outpoint early
 
+### Test
+
+- #30552 test: fix constructor of msg_tx
+
 ### Build
 
 - #30283 upnp: fix build with miniupnpc 2.2.8
+- #30633 Fixes for GCC 15 compatibility
 
 ### CI
 
@@ -73,6 +78,7 @@ Thanks to everyone who directly contributed to this release:
 - Ava Chow
 - Cory Fields
 - Martin Zumsande
+- Matt Whitlock
 - Max Edwards
 - Sebastian Falbesoner
 - willcl-ark

src/chainparamsbase.h

@@ -7,6 +7,7 @@
 
 #include <util/chaintype.h>
 
+#include <cstdint>
 #include <memory>
 #include <string>
 

src/node/interface_ui.h

@@ -6,9 +6,10 @@
 #ifndef BITCOIN_NODE_INTERFACE_UI_H
 #define BITCOIN_NODE_INTERFACE_UI_H
 
+#include <cstdint>
 #include <functional>
-#include <memory>
 #include <string>
+#include <vector>
 
 class CBlockIndex;
 enum class SynchronizationState;

src/policy/feerate.h

@@ -38,10 +38,8 @@ private:
 public:
     /** Fee rate of 0 satoshis per kvB */
     CFeeRate() : nSatoshisPerK(0) { }
-    template<typename I>
+    template<std::integral I> // Disallow silent float -> int conversion
     explicit CFeeRate(const I _nSatoshisPerK): nSatoshisPerK(_nSatoshisPerK) {
-        // We've previously had bugs creep in from silent double->int conversion...
-        static_assert(std::is_integral<I>::value, "CFeeRate should be used without floats");
     }
 
     /**

test/functional/test_framework/messages.py

@@ -1293,7 +1293,10 @@ class msg_tx:
     __slots__ = ("tx",)
     msgtype = b"tx"
 
-    def __init__(self, tx=CTransaction()):
+    def __init__(self, tx=None):
+        if tx is None:
+            self.tx = CTransaction()
+        else:
             self.tx = tx
 
     def deserialize(self, f):