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87de9c8f5c
dash/contrib
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fanquake 87de9c8f5c Merge #17929: build: add linker optimisation flags to gitian & guix (Linux) 
f2b5b0a3b48f9241971c14238040048f8b630811 build: add linker optimization flags to guix (fanquake)
b8b050a8d642e38c81d1e451750c2c8db92fee5e build: add linker optimization flags to gitian descriptors (fanquake)

Pull request description:

  This PR adds `-Wl,O2` to our gitian and guix LDFLAGS. This makes the linker perform certain optimisations (and is different from LTO).

  Any -O argument will enable optimizations in GNU ld. We can use -O2 here, as this matches our compile flags. Note that this would also enable additional optimizations if using the lld or gold linkers, when compared to -O0.

  A nice writeup + diagrams of some of these optimizations is  available here: http://lwn.net/Articles/192624/.

  #### master
  ```bash
  # bitcoind
  Histogram for `.gnu.hash' bucket list length (total of 3 buckets)
   Length  Number     % of total  Coverage
        0  1          ( 33.3%)       0.0%
        1  0          (  0.0%)       0.0%
        2  1          ( 33.3%)      40.0%
        3  1          ( 33.3%)     100.0%
  ```
  ```bash
  # bitcoin-qt
  Histogram for `.gnu.hash' bucket list length (total of 3 buckets)
   Length  Number     % of total  Coverage
        0  0          (  0.0%)       0.0%
        1  1          ( 33.3%)      10.0%
        2  0          (  0.0%)      10.0%
        3  0          (  0.0%)      10.0%
        4  1          ( 33.3%)      50.0%
        5  1          ( 33.3%)     100.0%
  ```

  #### this PR:
  ```bash
  # bitcoind
  Histogram for `.gnu.hash' bucket list length (total of 8 buckets)
   Length  Number     % of total  Coverage
        0  3          ( 37.5%)       0.0%
        1  5          ( 62.5%)     100.0%
  ```
  ```bash
  # bitcoin-qt
  Histogram for `.gnu.hash' bucket list length (total of 19 buckets)
   Length  Number     % of total  Coverage
        0  9          ( 47.4%)       0.0%
        1  10         ( 52.6%)     100.0%
  ```

  #### GNU ld -O

  > If level is a numeric values greater than zero ld optimizes the output. This might take significantly longer and therefore probably should only be enabled for the final binary. At the moment this option only affects ELF shared library generation. Future releases of the linker may make more use of this option. Also currently there is no difference in the linker’s behaviour for different non-zero values of this option. Again this may change with future releases.

  #### lld -O

  > Optimize output file size

ACKs for top commit:
  dongcarl:
    ACK f2b5b0a3b48f9241971c14238040048f8b630811
  laanwj:
    ACK f2b5b0a3b48f9241971c14238040048f8b630811

Tree-SHA512: e53f3a4338317dbec65d3a93b57b5a6204aabdf9ac82d99447847a3c8627facc53c58c2cf947376f13edd979fc8129a80f18d9ebeccd191a576c83f1dad5c513
2023-02-20 09:09:23 -06:00
..
auto_gdb chore: add missing copyrights via copyright_header.py insert 2023-01-13 00:49:04 +03:00
containers chore: add missing copyrights via copyright_header.py insert 2023-01-13 00:49:04 +03:00
debian Merge #19474: doc: Use precise permission flags where possible 2023-01-19 23:37:39 -06:00
devtools partial bitcoin#23511: require glibc 2.18+ 2023-01-18 19:02:39 -06:00
gitian-descriptors Merge #17929: build: add linker optimisation flags to gitian & guix (Linux) 2023-02-20 09:09:23 -06:00
gitian-keys contrib: Added thephez.pgp (#3750) 2020-09-30 15:30:55 +03:00
guix Merge #17929: build: add linker optimisation flags to gitian & guix (Linux) 2023-02-20 09:09:23 -06:00
init Merge #16569: Increase init file stop timeout 2022-04-02 16:30:52 +05:30
linearize Merge #15257: Scripts and tools: Bump flake8 to 3.7.8 2021-10-05 20:34:01 +03:00
macdeploy Merge #20880: gitian: Use custom MacOS code signing tool 2022-08-17 18:30:05 +03:00
qos Partial Merge #14831: Scripts and tools: Use #!/usr/bin/env bash instead of #!/bin/bash. 2021-08-15 11:08:08 -04:00
seeds Merge #17823: scripts: Read suspicious hosts from a file instead of hardcoding 2022-10-17 15:41:14 -05:00
testgen Merge #16812: doc: Fix whitespace errs in .md files, bitcoin.conf, and Info.plist.in 2022-01-20 13:09:17 -05:00
verify-commits partial merge #16327: scripts and tools: Update ShellCheck linter 2021-12-03 18:13:01 +03:00
verifybinaries partial merge #16327: scripts and tools: Update ShellCheck linter 2021-12-03 18:13:01 +03:00
windeploy partial merge #16327: scripts and tools: Update ShellCheck linter 2021-12-03 18:13:01 +03:00
zmq Merge bitcoin#14060: ZMQ: add options to configure outbound message high water mark, aka SNDHWM (#4360) 2021-09-08 12:39:06 -04:00
dash-cli.bash-completion Merge #17282: contrib: remove accounts from bash completion 2022-05-31 12:06:32 -04:00
dash-qt.pro merge bitcoin#15450: Create wallet menu option 2022-04-06 13:49:58 +05:30
dash-tx.bash-completion Merge #8289: bash-completion: Adapt for 0.12 and 0.13 2017-12-28 11:44:59 +01:00
dashd.bash-completion merge #17165: Remove BIP70 support (#4023) 2022-04-25 12:01:47 +03:00
filter-lcov.py Merge #17691: doc: Add missed copyright headers 2022-04-02 09:19:20 +05:30
gitian-build.py fix(gitian): Fetch tags while cloning the repo via gbuild (#4976) 2022-08-17 17:37:07 +03:00
README.md Merge #16812: doc: Fix whitespace errs in .md files, bitcoin.conf, and Info.plist.in 2022-01-20 13:09:17 -05:00
valgrind.supp Merge #18879: valgrind: remove outdated suppressions 2023-01-23 12:22:30 -06:00

README.md

Repository Tools

Developer tools

Specific tools for developers working on this repository. Contains the script github-merge.py for merging GitHub pull requests securely and signing them using GPG.

Verify-Commits

Tool to verify that every merge commit was signed by a developer using the above github-merge.py script.

Linearize

Construct a linear, no-fork, best version of the blockchain.

Qos

A Linux bash script that will set up traffic control (tc) to limit the outgoing bandwidth for connections to the Dash network. This means one can have an always-on dashd instance running, and another local dashd/dash-qt instance which connects to this node and receives blocks from it.

Seeds

Utility to generate the pnSeed[] array that is compiled into the client.

Build Tools and Keys

Debian

Contains files used to package dashd/dash-qt for Debian-based Linux systems. If you compile dashd/dash-qt yourself, there are some useful files here.

Gitian-descriptors

Notes on getting Gitian builds up and running using KVM.

Gitian-keys

PGP keys used for signing Dash Core Gitian release results.

MacDeploy

Scripts and notes for Mac builds.

Gitian-build

Script for running full Gitian builds.

Test and Verify Tools

TestGen

Utilities to generate test vectors for the data-driven Dash tests.

Verify Binaries

This script attempts to download and verify the signature file SHA256SUMS.asc from bitcoin.org.