ARM6 Compiler Support

[PBull]

Hello,

I tried to port an TouchGFX-Application from ARM5-Compiler (ARMCC) to ARM6 (ARMCLANG). Both compilers are from KEIL (µVision).

Well it does compile, but it doesn't link:

Warning: L6869W: abstractpainter.o requested the Rogue Wave Standard C++ Library which has been removed from the product. This might cause link errors because libc++ is used instead.

Error: L6242E: Cannot link object abstractshape.o as its attributes are incompatible with the image attributes.

(There are a lot more linker errors)

I do believe the provided TouchGFX-Library is not compatible with ARMCLANG (and there is no other library supplied in ...\TouchGFX\4.10.0\touchgfx\lib\core\cortex_m7\Keil)

Is that the case, or did I miss something else?

[PBull]

Hi Martin,

thanks for the library!

I created a new project from scratch (with the stm32f746-disco board)

and TouchGFX works fine with ARMCLANG, as long as you don't use the Middleware from Keil (at least the File System & USB libary).

Then linker error occurs.

I figured out that:

TouchGFX only links when "Short enums/wchar" is disabled

Middleware only links when "Short enums/wchar" is enabled

Keil mentioned : "The wchar_t type must be the same in all source and libraries to successfully link."

Can you build the library with "Short enums/wchar" enabled? This should fix the problem.

Detailed information here:

http://www.keil.com/support/docs/3975.htm

[Martin KJELDSEN]

Thanks for the heads up!

I'll try to get around to it today.

/Martin

[Martin KJELDSEN]

Try this:

http://sw-center-st-com.s3-eu-west-1.amazonaws.com/touchgfx/TouchGFX/Patches/4.13.0/touchgfx_core_clang.zip

Extract it at the root of your 4.13.0 installation and it should update the correct folder (m7 only currently). The lib is called touchgfx_core_clang.lib.

/Martin

[jimmii]

Hi @Martin KJELDSEN​ 

Thanks.

Now I get a lot less linker errors: (I enabled the "Short enums/wchar" option)

[PBull]

I tried it myself and got the same linker errors.

You can demote the linker error message to a warning by adding "--diag-warning=6242" in the Linker-Tab.

But I don't feel particularly comfortable doing this...

[Martin KJELDSEN]

I thought this linker error is what we just fixed with the short enums/wchar option.

[jimmii]

As you can see in an above screenshot, we had a lot more errors (we came from about 44 errors down to 3). They disappeared with the new library.

Why they didn't fix the errors on stm32_crc_lock, texturemaptypes, renderingbuffer is a good question.

Do these files have a seperate configuration? (in Keil I think you can change the setting also per file basis...)

[Martin KJELDSEN]

There are no special settings for those files and they inherit the global settings of "short wchar". I'll have to look into it.

[Martin KJELDSEN]

I updated the library at the same link. I've managed to create a compiling (cmsis os code does not work well with ARMCLANG!) and linking project (Don't enable MicroLib).

/Martin

[Martin KJELDSEN]

compiling Kerning_verdana_40_4bpp.cpp...
compiling Screen1ViewBase.cpp...
compiling Table_verdana_10_4bpp.cpp...
compiling Table_verdana_20_4bpp.cpp...
compiling Table_verdana_40_4bpp.cpp...
compiling TypedTextDatabase.cpp...
compiling Texts.cpp...
linking...
STM32F769I_DISCO.sct(18): warning: L6314W: No section matches pattern *.o(ExtFlashSection).
Program Size: Code=104996 RO-data=15748 RW-data=168 ZI-data=7136  
Finished: 0 information, 1 warning and 0 error messages.
FromELF: creating hex file...
"STM32F769I_DISCO\STM32F769I_DISCO.axf" - 0 Error(s), 1 Warning(s).
Build Time Elapsed:  00:00:18

(warning is just because i have no images or fonts in my application to go into external flash)