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Mailing lists / lazarus / 2026-10

Lazarus Release Candidate 1 of 5.0

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Mattias Gaertner

The Lazarus team is glad to announce the first release candidate of Lazarus 5.0.

https://lazarus-ide.org/

Download:
https://download.lazarus-ide.org/

Choose your CPU, OS, distro and then the "Lazarus 5.0RC1" directory.

This release candidate was built with FPC 3.2.2, except for macOS and Linux arm64, which were built with FPC 3.2.4RC2.

Here is the list of changes for Lazarus and Free Pascal: https://wiki.lazarus.freepascal.org/Lazarus_5.0_release_notes https://wiki.lazarus.freepascal.org/User_Changes_3.2.2

Here is the list of fixes for Lazarus 5.x:
https://gitlab.com/freepascal.org/lazarus/lazarus/-/commits/fixes_5/

Checksums for the files:
https://www.lazarus-ide.org/index.php?page=checksums#5_0RC1

Minimum requirements:

Windows:
2k, 32 or 64bit, Qt, Qt5, Qt6 (64bit only)

FreeBSD/Linux:
gtk2 2.24 for gtk2, gtk3 3.24 for gtk3, qt4.5 for qt, qt5.6 for qt5, Qt6.2 for qt6, 32 or 64bit.

Mac OS X:
Cocoa (64bit) 10.15, Carbon (32bit) 10.5 to 10.14, Qt and Qt5 (32 or 64bit), Qt6 (64bit only).

The gitlab page:
https://gitlab.com/freepascal.org/lazarus/lazarus/-/tree/lazarus_5_0_RC1

Download mirrors:
https://sourceforge.net/projects/lazarus/files/
ftp://ftp.freepascal.org/pub/lazarus/releases/

== Why should everybody (including you) test the release candidate? ==

In the past weeks the Lazarus team has stabilized the 5.0 fixes branch. The resulting 5.0RC1 is now stable enough to be used by any one for test purposes.

While we have tested those ourselves, there may still be problems that only occur with very specific configurations or one project in a million.

Yes, it may be that you are the only person with a project, that will not work in the new IDE. So if you do not test, we can not fix it.

Please do not wait for the final release, in order to test. It may be too late. Once the release is out we will have to be more selective about which fixes can be merged for further 5.x releases. So it may be, that we can not merge the fix you require. And then you will miss out on all the new features.

== How to test ==

Download and install the 5.0 RC1.
- On Windows you can install as a 2ndary install, that will not affect your current install:

http://wiki.lazarus.freepascal.org/Multiple_Lazarus#Installation_of_multiple_Lazarus
- On other platforms, if you install to a new location you need to use --primary-config-path

In either case you should make backups. (including your primary config)

Open your project in your current Lazarus, and use "Publish Project" from the project menu. This creates a clean copy of your project.

You can then open that copy in the 5.0RC1. Please test:
- If you can edit forms in the designer
- rename components / change properties in Object inspector / Add new events
- Add components to form / Move components on form
- Frames, if you use them
- If you can navigate the source code (e.g. jump to implementation)
- Auto completion in source code
- Compile, debug and run
- Anything else you use in your daily work

Mattias

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Martin Frb
to Mattias Gaertner
Mattias Gaertner wrote
The Lazarus team is glad to announce the first release candidate of Lazarus 5.0.

For Windows there are new "add ons". A debug build for the RTL (the entire FPC build with debug info).

To use that it needs to be installed after the main installer. It should be installed into the same directory.
- It will create a sub directory fpc-dbg
- To use the debug RTL/FPC you need to change the compiler (global, or in project options)
- This means all packages (LCL, LazUtils, ....) need to be rebuild each time you make that change.

Unfortunately the IDE does not pick up when you make that change the very first time => you must open the package "FCL" and rebuild it with the changed compiler (this will follow the compiler settings of the project options, if you changed it there).

After that you can change it forth and back, and the IDE detects it.

You may want to check out "Excluded routines" in the debugger options, if you want to avoid stepping into functions like fpc_object_check

----------------------------
Also for anyone interested. Snapshots for Windows with the FPC 3.2.4 RC2 are available at:
64bit:
https://sourceforge.net/projects/lazarus-snapshots/files/Window%2064/2026-10-08%20Lazarus-5.0RC1%20with%20FPC-3.2.4RC2 32bit:
https://sourceforge.net/projects/lazarus-snapshots/files/Window%2032/2026-10-08%20Lazarus-5.0RC1%20with%20FPC-3.2.4RC2

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Flávio Etrusco
to Martin Frb

Great!!

Martin Frb wrote 40 lines
On 16/10/2026 10:57, Mattias Gaertner via lazarus wrote: > The Lazarus team is glad to announce the first release candidate of > Lazarus 5.0. For Windows there are new "add ons". A debug build for the RTL (the entire FPC build with debug info). To use that it needs to be installed after the main installer. It should be installed into the same directory. - It will create a sub directory fpc-dbg - To use the debug RTL/FPC you need to change the compiler (global, or in project options) - This means all packages (LCL, LazUtils, ....) need to be rebuild each time you make that change. Unfortunately the IDE does not pick up when you make that change the very first time => you must open the package "FCL" and rebuild it with the changed compiler (this will follow the compiler settings of the project options, if you changed it there). After that you can change it forth and back, and the IDE detects it. You may want to check out "Excluded routines" in the debugger options, if you want to avoid stepping into functions like fpc_object_check ---------------------------- Also for anyone interested. Snapshots for Windows with the FPC 3.2.4 RC2 are available at: 64bit: https://sourceforge.net/projects/lazarus-snapshots/files/Window%2064/2026-10-08%20Lazarus-5.0RC1%20with%20FPC-3.2.4RC2 32bit: https://sourceforge.net/projects/lazarus-snapshots/files/Window%2032/2026-10-08%20Lazarus-5.0RC1%20with%20FPC-3.2.4RC2 -- _______________________________________________ lazarus mailing list https://lists.lazarus-ide.org/listinfo/lazarus

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