Coressent Korea - Freescale i.MX6 RTEMS/Qt SDK Release Information.

[JunBeom Kim (Coressent)]

Dear Chris,

Thank you very much for your comment.

1. select()
  - I will try to use rtems-libbsd soon regarding this.

2. mmap()
  - Qt 4.8 can be built without mmap feature. 
  - If I need mmap for Qt 5.x, I will use your mmap code. Thank you.

3. fstatvfs()
  - I tried to implemented fstatvfs() for Qt. but, I was failed.
  - As I check from GCC toolchain for Linux, there is fstatvfs(). But, there
is not this function from GCC toolchain for RTEMS. I don't know reason. If
there is a method for adding this function on RSB build process, this
problem will be resolved.

4. Shared library
  - I didn't test libdl for this. I will try to use libdl for porting WebKit
of Qt 4.8 or WebEngine of Qt 5.5.

5. Your comment, "How do they build Qt with the same code base ?"
  - I referenced QNX interface layer due to almost same POSIX API. But, API
between QNX and RTEMS is not equal in 100%. Therefore, a user should patch
Qt source.

Best Regards,
JunBeom

-----Original Message-----
From: Chris Johns [mailto:chrisj at rtems.org] 
Sent: Tuesday, July 14, 2015 3:00 PM
To: JunBeom Kim (Coressent); 'Gedare Bloom'
Cc: users at rtems.org
Subject: Re: Coressent Korea - Freescale i.MX6 RTEMS/Qt SDK Release
Information.

On 14/07/2015 2:56 pm, JunBeom Kim (Coressent) wrote:
> 
> - select() : select() function should be patched for calling select() by
Qt Event dispatcher.

The rtems-libbsd project may help here.

> - mmap() : because mmap is not supported on RTEMS, Qt should be patched.

Do these files ....

 https://git.rtems.org/chrisj/rtl.git/tree/mmap.c
 https://git.rtems.org/chrisj/rtl.git/tree/munmap.c
 https://git.rtems.org/chrisj/rtl.git/tree/mmap-internal.h

help ?

> - fstatvfs() : because fstatvfs() is not supported in GCC toolchain
library, Qt File Dialog should be disabled.

Could you add this support to RTEMS ?

> - shared library : because this is not supported, QtWebKit can not be
ported.

There is libdl. What is the API used ?

> - OpenGL ES : because there is not OpenGL ES for RTEMS, Qt Quick can not
be ported. If there is OpenGL ES driver for RTEMS, there is possibility for
porting Qt Quick.
> - No process model : because RTEMS can not support OS process model, Qt
pthread only is supported.

Correct, RTEMS is a single address space.

> 
> 2. Qt License issue.
> 
> I have discussed with Qt company regarding Qt distribution for RTEMS in
many times.
> Important thing is that Qt source should be modified in many parts due to
RTEMS technical issue.
> 
> Because we modified Qt source and Qt library is linked with RTEMS
statically, we can not provide open community or customers with Qt porting
source code(Open Source License / GPL&LGPL). That is, customer should
purchase Qt commercial license. This is very headache issue in customer
considering point.
> 
> If user want to use RTOS solution on Qt open source license, there are
three RTOS solution vendors(QNX, VxWorks, Integrity). But, these RTOS
solution have royalty business model.
> I guess that Qt license is better condition than RTOS license.
> 

How do they build Qt with the same code base ?

Chris