Merge #1575: release: prepare for 0.5.1

40d87b8 release: prepare for 0.5.1 (Jonas Nick)
5770226 changelog: clarify CMake option (Jonas Nick)

Pull request description:

ACKs for top commit:
  sipa:
    ACK 40d87b8
  hebasto:
    ACK 40d87b8.

Tree-SHA512: f021cd948239ad1a9b2feb854a95d4a559f06a559d0e4932bc176458475f13a81082a2f7410f2fc6ae259c93a484101f44ff1d3f720773c0fda877562de08bc3

CHANGELOG.md

@@ -5,13 +5,20 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [0.5.1] - 2024-08-01
 
 #### Added
  - Added usage example for an ElligatorSwift key exchange.
 
+#### Changed
+ - The default size of the precomputed table for signing was changed from 22 KiB to 86 KiB. The size can be changed with the configure option `--ecmult-gen-kb` (`SECP256K1_ECMULT_GEN_KB` for CMake).
+ - "auto" is no longer an accepted value for the `--with-ecmult-window` and `--with-ecmult-gen-kb` configure options (this also applies to  `SECP256K1_ECMULT_WINDOW_SIZE` and `SECP256K1_ECMULT_GEN_KB` in CMake). To achieve the same configuration as previously provided by the "auto" value, omit setting the configure option explicitly.
+
 #### Fixed
-- Fixed compilation when the extrakeys module is disabled.
+ - Fixed compilation when the extrakeys module is disabled.
+
+#### ABI Compatibility
+The ABI is backward compatible with versions 0.5.0, 0.4.x and 0.3.x.
 
 ## [0.5.0] - 2024-05-06
 
@@ -20,7 +27,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 #### Changed
  - The implementation of the point multiplication algorithm used for signing and public key generation was changed, resulting in improved performance for those operations.
-   - The related configure option `--ecmult-gen-precision` was replaced with `--ecmult-gen-kb` (`ECMULT_GEN_KB` for CMake).
+   - The related configure option `--ecmult-gen-precision` was replaced with `--ecmult-gen-kb` (`SECP256K1_ECMULT_GEN_KB` for CMake).
    - This changes the supported precomputed table sizes for these operations. The new supported sizes are 2 KiB, 22 KiB, or 86 KiB (while the old supported sizes were 32 KiB, 64 KiB, or 512 KiB).
 
 #### ABI Compatibility
@@ -134,7 +141,7 @@ This version was in fact never released.
 The number was given by the build system since the introduction of autotools in Jan 2014 (ea0fe5a5bf0c04f9cc955b2966b614f5f378c6f6).
 Therefore, this version number does not uniquely identify a set of source files.
 
-[unreleased]: https://github.com/bitcoin-core/secp256k1/compare/v0.5.0...HEAD
+[0.5.1]: https://github.com/bitcoin-core/secp256k1/compare/v0.5.0...v0.5.1
 [0.5.0]: https://github.com/bitcoin-core/secp256k1/compare/v0.4.1...v0.5.0
 [0.4.1]: https://github.com/bitcoin-core/secp256k1/compare/v0.4.0...v0.4.1
 [0.4.0]: https://github.com/bitcoin-core/secp256k1/compare/v0.3.2...v0.4.0

configure.ac

@@ -6,7 +6,7 @@ AC_PREREQ([2.60])
 define(_PKG_VERSION_MAJOR, 0)
 define(_PKG_VERSION_MINOR, 5)
 define(_PKG_VERSION_PATCH, 1)
-define(_PKG_VERSION_IS_RELEASE, false)
+define(_PKG_VERSION_IS_RELEASE, true)
 
 # The library version is based on libtool versioning of the ABI. The set of
 # rules for updating the version can be found here: