[arm-gnu] Compiler versions other than 2009q3-68 all fail??

[Sergei Poselenov]

Hi Chen,

Generally, such regression suggests some problems in the code (btw -
please consider to reduce the whole project to some easily-read example
which causes regression. It will help you to point down the problem).

I'd suggest the following:
 - Add "-Wall" to the compiler CFLAGS (if not already added) and address
all warnings.
 - Check that all references to the hardware registers in the source
code are not optimized out by the compiler (use "volatile" where
appropriate).
 - Check/compare the actual code generated by the toolchain (use
"arm-non-eabi-objdump -d").

Regards,
Sergei

On Thu, 2012-02-02 at 19:50 -0600, chen at chinstruments.com wrote:
> resend as plain text (no html or attachment)
> 
> ---------------------------- Original Message ----------------------------
> Subject: Compiler versions other than 2009q3-68 all fail??
> Date:    Thu, February 2, 2012 2:20 pm
> To:      arm-gnu at codesourcery.com
> --------------------------------------------------------------------------
> 
> I have code (linked below) that only runs correctly when compiled only
> with arm-none-eabi version 2009q3-68; the application fails when compiled
> with *both newer and older versions* of arm-none-eabi.
> 
> The problems were observed on TI's AM1707 EVM Rev. H (ARM926EJ-S core). 
> The code is a bare metal application that runs the EVM board as a generic
> USB bulk device, with console output via serial port interrupts.  Using
> the same code and EVM board, different behavior is obtained when using
> different compiler versions (no internal compiler errors for any version):
> 
> Older CodeSourcery versions (2009q1-161 and older, through 2008)
> ---------------------------
>   *  Everything works fine when run from debugger, but...
>   *  USB enumeration fails, but only when application is flashed to the board
> 
> 
> Newer CodeSourcery versions (2010q1-188 to 2011.09-69)
> ---------------------------
>   *  Serial port outputs as gibberish via interrupts (both from debugger
> and when flashed)
>   *  USB enumeration fails (both from debugger and when flashed)
> 
> 
> CodeSourcery G++ Lite version 2009q3-68
> ---------------------------------------
>   *  Everything works correctly!
> 
>   *  Serial port output works correctly (both from debugger and when flashed)
>   *  USB enumeration and data transfer work correctly (both from debugger
> and when flashed)
> 
> 
> Source code + makefile + long description
> <http://e2e.ti.com/support/embedded/starterware/f/790/t/151682.aspx?PageIndex=2#584582>
> 
> More on serial port regression
> <http://e2e.ti.com/support/embedded/starterware/f/790/t/160340.aspx>
> 
> Serial port only code (no USB)
> <http://e2e.ti.com/support/embedded/starterware/f/790/t/151682.aspx#570450>
> _______________________________________________
> arm-gnu mailing list
> arm-gnu at codesourcery.com
> http://sourcerytools.com/cgi-bin/mailman/listinfo/arm-gnu