build: Add multiple depends source fallback capability and Fix configure.ac changes for boost >=1.89

[jamescowens]

This is a fix for #2823. It also adds multiple fallback source capability for depends source file downloads. The current secondary fallback is set to the project lead's AWS S3 source bucket.

Closes #2820.

[Copilot]

Pull Request Overview

This pull request upgrades Boost from version 1.81.0 to 1.89.0 and adds a multiple fallback source capability for the depends build system to improve reliability when downloading dependency source files.

• Boost library upgraded from 1.81.0 to 1.89.0 with corresponding SHA256 hash update
• Multiple fallback download paths implemented for source file downloads
• Fixed configure.ac logic to properly detect Boost.System as header-only in Boost >= 1.89.0

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
depends/packages/boost.mk	Updates Boost version to 1.89.0 and SHA256 hash for the new version
depends/funcs.mk	Implements multiple fallback URL support in the fetch_file function with improved error messaging
depends/Makefile	Defines FALLBACK_DOWNLOAD_PATHS with primary and secondary fallback sources, and adds unused DOWNLOAD variable definition
configure.ac	Refactors Boost.System header-only detection logic for compatibility with Boost >= 1.89.0 (though formatting needs improvement)

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[jamescowens]

Note that the 1.89+ boost fix was verified by first doing CI against boost <1.89 (1.81 was in the original boost.mk package), and then incrementing boost to 1.89 in a new commit, and then checking CI again. All passed.

[jamescowens]

We are ahead of many coins but we are definitely a little behind Bitcoin Core in updating the depends side of the build system and getting Qt6 done there. Bitcoin Core has had a significant amount of activity this year.Sent from my iPhoneOn Nov 17, 2025, at 12:37 PM, Xeno345 ***@***.***> wrote:Xeno345 left a comment (gridcoin-community/Gridcoin-Research#2824) Les autre crypto populaire font aussi clés changement ? Cela est récent ou Gridcoin est en retard un peu ? Téléchargez Outlook pour iOS<https://aka.ms/o0ukef>

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________________________________ De : James C. Owens ***@***.***> Envoyé : Sunday, November 16, 2025 10:51:51 AM À : gridcoin-community/Gridcoin-Research ***@***.***> Cc : Subscribed ***@***.***> Objet : Re: [gridcoin-community/Gridcoin-Research] build: Add multiple depends source fallback capability and Fix configure.ac changes for boost >=1.89 (PR #2824) [https://avatars.githubusercontent.com/u/7529186?s=20&v=4]jamescowens left a comment (gridcoin-community/Gridcoin-Research#2824)<#2824 (comment)> Note that the 1.89+ boost fix was verified by first doing CI against boost <1.89 (1.81 was in the original boost.mk package), and then incrementing boost to 1.89 in a new commit, and then checking CI again. All passed. — Reply to this email directly, view it on GitHub<#2824 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/BSXDQE6GRTH23ROSBDLDPA335CMRPAVCNFSM6AAAAACMFA2BO2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTKMZYHA4TCOJWGQ>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***> —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you modified the open/close state.Message ID: ***@***.***>