[Patch,AVR]: Fix PR13697: Wrong symbols with --gc-sections
Tue May 29 06:31:00 GMT 2012
Hans-Peter Nilsson schrieb:
> On Mon, 28 May 2012, Georg-Johann Lay wrote:
>> This bug is because an empty .data will be removed by the ld machinery.
> I think that bug has been fixed, at least, if you add a
> symbol-setting (one without PROVIDE) which seems slightly better
> than decorating input .data sections with KEEP, which just stops
> --gc-sections for *any* input .data.
>> PR 13697
>> * scripttempl/avr.sc (.data): Keep it.
> (bah, I have to cutnpaste; pine doesn't quote attachments):
>> + /* --gc-sections will delete empty .data. This leads to wrong start
>> + addresses for subsequent sections because -Tdata= from the command
>> + line will have no effect, see PR13697. Thus, keep .data */
>> + KEEP (*(.data))
> "KEEP" is a decoration, not a separate statement. At a minimum,
> drop the first "*(.data). It's at least confusing, but might
> add a second copy, I'm not sure.
I am definitely no linker hero... it's just like
*(.init0) /* Start here after reset. */
and many others. So all this in the avr ls script is plain wrong?
> Try without --gc-sections and gc:able .data.
er... sorry, would you outline this? I searched for "gc:able"
documentation but with no avail.
> Though, adding a symbol should do it, at least for a corrected
You mean adding a symbol to .data by letting the compiler add a symbol
in .data for each module?
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