Licensing a Lazarus application

[lstenberg]

Hi
I have developed a graphical application using lazarus incl. LCL and components like tachart etc.
Can I make the application open source GPLv3 specifying my contribution to the app is GPLv3 and all other parts (i.e. lazarus, LCL, used components) are covered by other licenses LGPL etc.?

If yes, it means I will only provide source code for my contribution and refer to others for source code according to their specific licensing model - right? 

[Handoko]

http://wiki.lazarus.freepascal.org/TAChart

The link above said:
TAChart is the principal component of a TeeChart-like charting framework for Lazarus offered under an LGPL licence.

The components bundled with Lazarus default installation are in LGPL too.

This wiki page:
https://en.wikipedia.org/wiki/GNU_Lesser_General_Public_License

says

One feature of the LGPL is the permission to relicense under the GPL any piece of software which is received under the LGPL (see section 3 of the LGPL version 2.1, and section 2 option b of the LGPL version 3). This feature allows for direct reuse of LGPLed code in GPLed libraries and applications.

I believe the answer for you question is, yes you can link them into your GPL application and refer them without need to provide their source code (as long as you do not modify them).

[lainz]

Take as example LazPaint that is GPL, but BGRABitmap is LGPL, and that combination of licenses is possible.

[lstenberg]

Many thanks for the replies 

[srvaldez]

it should be mentioned that FPC is licensed under a modified LGPL http://wiki.lazarus.freepascal.org/FPC_modified_LGPL

[Handoko]

I might be wrong. But as far as I know, Free Pascal is licensed under the GPL with static linking exception. The libraries bundled with the default installation are licensed under modified LGPL.

[PascalDragon]

The compiler itself and the text mode IDE is GPL without any exception.
The RTL, the FCL and the packages are licensed as LGPL with static linking exception.