tidy: modernize-use-nullptr #24971

pull fanquake wants to merge 2 commits into bitcoin:master from fanquake:clang_tidy_nullptr changing 12 files +29 −13

fanquake commented at 11:54 AM on April 25, 2022: member

Alternative to #15112 which uses clang-tidy to do perform the checking, rather than -Wzero-as-null-pointer-constant, and avoids having to uses pragmas, i.e:

#if defined(HAVE_CONFIG_H)
#include <config/bitcoin-config.h>
#endif

#if defined(HAVE_W_ZERO_AS_NULL_POINTER_CONSTANT)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wzero-as-null-pointer-constant"
#pragma GCC diagnostic ignored "-Wunknown-pragmas"
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
#endif

to suppress warnings coming from upstream code.

Can be tested by dropping the preceding commit. Should produce errors like:

clang-tidy-14 --use-color -p=/home/ubuntu/ci_scratch/ci/scratch/build/bitcoin-x86_64-pc-linux-gnu /home/ubuntu/ci_scratch/ci/scratch/build/bitcoin-x86_64-pc-linux-gnu/src/netbase.cpp
/home/ubuntu/ci_scratch/ci/scratch/build/bitcoin-x86_64-pc-linux-gnu/src/netbase.cpp:678:36: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
        if (!Socks5(strDest, port, 0, sock)) {
                                   ^
                                   nullptr

in src/.bear-config:7 in 95ed7e5793 outdated
```
   0 | @@ -0,0 +1,15 @@
   1 | +{
   2 | +  "output": {
   3 | +    "content": {
   4 | +      "include_only_existing_source": true,
   5 | +      "paths_to_include": [],
   6 | +      "paths_to_exclude": [
   7 | +        "src/leveldb"
```
MarcoFalke commented at 12:04 PM on April 25, 2022:

Maybe this file should be called bear-tidy-config, as it is missing files that would otherwise be compiled in a normal (non-tidy) build?

fanquake commented at 9:50 AM on April 26, 2022:

Have renamed to .bear-tidy-config.
MarcoFalke approved
fanquake cross-referenced this on Apr 25, 2022 from issue build: Optionally enable -Wzero-as-null-pointer-constant by Empact
DrahtBot added the label Build system on Apr 25, 2022
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fanquake removed the label GUI on Apr 25, 2022
fanquake removed the label Wallet on Apr 25, 2022
fanquake removed the label Build system on Apr 25, 2022
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DrahtBot added the label Build system on Apr 25, 2022
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DrahtBot added the label Wallet on Apr 25, 2022
DrahtBot commented at 5:57 PM on April 25, 2022: contributor


The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.



Conflicts

Reviewers, this pull request conflicts with the following ones:
- #24185 (refactor: only use explicit reinterpret/const casts, not implicit by PastaPastaPasta)
If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.
DrahtBot cross-referenced this on Apr 26, 2022 from issue refactor: only use explicit reinterpret/const casts, not implicit by PastaPastaPasta
Don't use zero as null pointer constant (-Wzero-as-null-pointer-constant) e53274868e
tidy: enable modernize-use-nullptr 9c96f1008b
fanquake force-pushed on Apr 26, 2022
MarcoFalke removed the label GUI on Apr 26, 2022
MarcoFalke removed the label Wallet on Apr 26, 2022
MarcoFalke removed the label Build system on Apr 26, 2022
MarcoFalke removed the label P2P on Apr 26, 2022
MarcoFalke added the label Refactoring on Apr 26, 2022
MarcoFalke approved
in src/.bear-tidy-config:15 in 9c96f1008b
```
  10 | +    "format": {
  11 | +      "command_as_array": true,
  12 | +      "drop_output_field": false
  13 | +    }
  14 | +  }
  15 | +}
```
MarcoFalke commented at 10:04 AM on April 26, 2022:

For reference: https://github.com/rizsotto/Bear/blob/master/source/citnames/man/citnames.1.md#config-file
laanwj commented at 1:05 PM on April 26, 2022: member

Concept and code review ACK 9c96f1008b4997aea31f293fed31f98ed3becfcf

avoids having to uses pragmas

Much better.
fanquake merged this on Apr 26, 2022
fanquake closed this on Apr 26, 2022
fanquake deleted the branch on Apr 26, 2022
sidhujag referenced this in commit 09047541df on Apr 26, 2022
PastaPastaPasta referenced this in commit 8b56495b90 on Oct 18, 2022
bitcoin locked this on Apr 26, 2023

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#15112 build: Optionally enable -Wzero-as-null-pointer-constant

tidy: modernize-use-nullptr #24971

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