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Release notes: TClass Alignment #22018

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pcanal merged 2 commits into from
Apr 22, 2026
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Release notes: TClass Alignment #22018

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Release notes: add missing empty line
pcanal Apr 22, 2026
fa2aa4d
Release notes: add TClass alignment
pcanal Apr 22, 2026
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4 changes: 4 additions & 0 deletions README/ReleaseNotes/v640/index.md
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Expand Up @@ -108,6 +108,9 @@ gInterpreter->Print("autoparsed");
for example, this can be used to enforce that no header is loaded for I/O operations. To disable the
auto-parsing during `TClass::GetClass`, you can either set the shell environment variable
`ROOT_DISABLE_TCLASS_GET_CLASS_AUTOPARSING` (to anything) or set the `rootrc` key `Root.TClass.GetClass.AutoParsing` to `false`.
* Alignment of classes and numerical types is now recorded in the dictionary and propagated through `TClass`, `TDataType`, and `TStreamerElement`. `TStreamerInfo::BuildOld` uses this information to correctly lay out emulated classes and older-version StreamerInfos (for the input of I/O customization), ensuring proper alignment for over-aligned types.
Fixes [#21667](https://github.com/root-project/root/issues/21667).
(PR [#21669](https://github.com/root-project/root/pull/21669))

## Geometry

Expand Down Expand Up @@ -184,6 +187,7 @@ See: https://github.com/root-project/root/pull/20963 for implementation details

* The behavior or `TDirectoryFile::mkdir` (which is also `TFile::mkdir`) was changed regarding the creation of directory hierarchies: calling `mkdir("a/b/c", "myTitle")` will now assign `myTitle` to the innermost directory `"c"` (before this change it would assign it to `"a"`).
* Fixed a bug in `TDirectoryFile::mkdir` where passing `returnExistingDirectory = true` would not work properly in case of directory hierarchies. The option is now correctly propagated to `mkdir`'s inner invocations.

### File Permissions Now Respect System `umask`

ROOT now respects the system `umask` when creating files, following standard Unix conventions.
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