Re: [ECOS] eCos arm-eabi GNU tools - test release 4.6.3-20120315

[Ilija Kocho <ilijak@siva.com.mk>]

On 19.03.2012 09:18, Lambrecht Jürgen wrote:
> On 03/18/2012 05:08 PM, John Dallaway wrote:
>> I have generated a new test release of the GNU tools for ARM targets
>> based on GCC 4.6.3. The new test release avoids issues with GCC 4.6.2. 
>> Ref:
>>
>> http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001468#c30
>>
> I am testing 4.6.2 (AT91SAM9260 platform), and will try 4.6.3 to go on 
> (ecos 3.0 builds OK, but our application fails).
> But when I want to see those "issues with GCC 4.6.2", I get this:
>
>      You are not authorized to access bug #1001468.
>
> (I can see other bugs.)
> Why is this? Maybe something wrong with my account, because when I go to 

There's nothing wrong with your account. This bug is for use by eCos
maintainers.
I apologize for inconvenience.
Below is a copy of the subject link that explains the reason for our
switch to 4.6.3.

Ilija

The comment: ================

Another serious bug in GCC 4.6.2

I have started playing with Cortex-M4 Floating Point Unit and found out that
conversion between float and double doesn't work when hardware floating point
is on: -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16

For instance:

{
     double dbl;
     float flo;

    //.....
     dbl = flo;
    // dbl is rubish
}

It is due to wrong helper library and seem to be the following bug:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51835

I tried GCC 4.6.3 and it seems to work. I'll do some more tests but IMO we
should start considering of replacing current 4.6.2-20120125 test release with
something newer, possibly 4.6.3. Building of 4.6.3, as noted by Sergei, is quite straight-forward - I just applied the 4.6.2 patches.

Of course, until this is resolved nothing can stop us from hunting warnings
with current test release.



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