On Wed, 19 Nov 2014 13:34:34 -0500, Bill Pringlemeir bpringlemeir@nbsps.com wrote:
In message 20141119074214.3d414ce6@lilith Albert wrote:
For -mauto-it, it is not documented in the gas documentation online or in my current as' --target-help. I'll dig this deeper today, but barring any scream from me, the change above is fine globally in U-Boot.
On 19 Nov 2014, wd@denx.de wrote:
Apparently this [1] is where it is coming from; no further documentation there, though.
[1] https://sourceware.org/ml/binutils/2009-05/msg00132.html
On Wed, 19 Nov 2014 11:31:05 -0500, Bill Pringlemeir
I would think that if this worked they would make it automatic and not an option. Probably this is only in certain binutils/as.
With 4.6.3 and 4.9.1 I do not have this option,
On 19 Nov 2014, albert.u.boot@aribaud.net wrote:
Which option do you mean? -mimplicit-it or -mauto-it?
'-mauto-it' , which I think if it is working correctly would be rolled into '-mimplicit-it' as it generates better code (for an assembler :). I followed the thread above and the patch originator says he needs to fix section issues and the 'command line options' and he would follow up the proposed patch.
On 20 Nov 2014, albert.u.boot@aribaud.net wrote:
I am getting lost, even when reading (quickly, I admit) the patch that adds it; I don't see what -mauto-it does exactly. Can you summarize and clarify the effects of -mimplicit-it (I guess I know this one but it's never a bad thing to get a second opinion), -mauto-it and their interaction?
I guess you know how the 'IT' works. The Ubuntu/Debian people give a good explanation in a few paragraphs,
https://wiki.ubuntu.com/ARM/Thumb2PortingHowto#Conditional_Execution
My trying to explain this may have confused thing...
Here is Wolfgang's reference,
https://sourceware.org/ml/binutils/2009-05/msg00132.html
Here is a 2nd reference,
https://sourceware.org/ml/binutils/2009-06/msg00162.html
Originally Daniel Gutson used '-mauto-it' and then it was converted to '-mimplicit-it'.
I am not sure if '-mauto-it' exists in the wild. I have never heard of that option before seeing this email thread. Also my assembler says,
Assembler messages: Error: unrecognized option -mauto-it
I have built with the most recent binutils, gcc4.9.1 using crosstool-ng. Maybe only some non-mainline tools picked up this '-mauto-it' patch. I don't think it hurts to support '-mauto-it', but an assembler test should be done to see if it accepts the option.
hth, Bill Pringlemeir.