Fix a compiler warning: unused GetDevURandom()
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Authored by PiRK on Sep 13 2021, 08:05.

Details

Reviewers

Fabien

Group Reviewers

Restricted Project

Commits

rABCc2bd741169fe: Fix a compiler warning: unused GetDevURandom()

Summary

random.cpp:255:13: error: unused function 'GetDevURandom' [-Werror,-Wunused-function]
Clang 9.0.0, FreeBSD 12.1

Silence by planting a dummy reference to the GetDevURandom symbol
in the places where we don't call the function.

We see the same warnings in our CI logs.

This is a backport of core#17563

Test Plan

ninja all check-all

Diff Detail

Repository

rABC Bitcoin ABC

Branch

pr17563

Lint

Lint Passed

Unit

No Test Coverage

Build Status

Buildable 16611
Build 33077: Build Diff	lint-circular-dependencies · build-without-wallet · build-debug · build-diff · build-clang · build-clang-tidy
Build 33076: arc lint + arc unit

Event Timeline

PiRK created this revision.Sep 13 2021, 08:05

Herald added a reviewer: Restricted Project. · View Herald TranscriptSep 13 2021, 08:05

PiRK requested review of this revision.Sep 13 2021, 08:05

teamcity edited the summary of this revision. (Show Details)Sep 13 2021, 08:05

@bot build-osx

teamcity awarded a token.Sep 13 2021, 08:06

Harbormaster completed remote builds in B16611: Diff 29897.Sep 13 2021, 08:22

What about [[maybe_unused]] ? That would be more elegant.

In D10090#227352, @Fabien wrote:

What about [[maybe_unused]] ? That would be more elegant.

I thought so too, but Greg Maxwell put some doubt in my mind. The only drawback I can think of with [[maybe_unused]] is that there will be no warning if some day the function ends up actually unused (accidentally or by design).

Relevant quotes from the PR discussion:

@vasild wrote:

Once we are on C++17, we can use maybe_unused directly in the code.

@gmaxwell wrote:

Marking that unused would be a great way to hid an actual bug in the future.

@vasild wrote:

Like what?

(No answer to this last one)

use [[maybe_unused]] when defining the function instead of planting dummy references to the function

Harbormaster completed remote builds in B16632: Diff 29934.Sep 14 2021, 08:36

Ok I actually read the comments. If there is a rationale for the previous approach then let's stick with that, I don't know if there is a plan to remove that function in the future.

revert back to diff id 29897

Harbormaster completed remote builds in B16640: Diff 29944.Sep 14 2021, 13:31

Fabien accepted this revision.Sep 15 2021, 05:43

This revision is now accepted and ready to land.Sep 15 2021, 05:43

Closed by commit rABCc2bd741169fe: Fix a compiler warning: unused GetDevURandom() (authored by Vasil Dimov <vd@FreeBSD.org>, committed by PiRK). · Explain WhySep 15 2021, 06:17

This revision was automatically updated to reflect the committed changes.

PiRK added a commit: rABCc2bd741169fe: Fix a compiler warning: unused GetDevURandom().