About the gcc Warning: setting incorrect section attributes for .note

About the gcc Warning: setting incorrect section attributes for .note

[XU SHENG]

Hi community,
	I want to add a note section in a ELF formatted file to
indentify some private information. So I declare a private variable in a
single c file use attribute like this:
	int priv_dat  __attribute__ ((section(".note"))) = MAGIC;

	while compile it using gcc 3.4.3, the compiler output following
warnings:

	/tmp/cc7Q0lRs.s: Assembler messages:
	/tmp/cc7Q0lRs.s:11: Warning: setting incorrect section
attributes for .note

	It's clear to me that only section marked attribute with the
startup of ".note" can be compiled to section with type SHT_NOTE in ELF
file. Then only problem is assembler in gcc assumed ".note" section as
"aw" (allocate/write) as default property, but actually, the .note
section can be only marked with "a" (note section is readonly). If I
modify the temporary .s export by gcc assembler by delete "w" property,
the warning is disappeared.

	I wonder if any processes can be done for remove this warning?
Because gcc variable attribute can not set detail section property.
	Thanks. 

Best Regards
Edison Xu 

Re: About the gcc Warning: setting incorrect section attributes for .note

[Adam Nemet]

"XU SHENG" <Sheng.Xu@alcatel-lucent.com> writes:
> 	int priv_dat  __attribute__ ((section(".note"))) = MAGIC;
>
...
>
> 	It's clear to me that only section marked attribute with the
> startup of ".note" can be compiled to section with type SHT_NOTE in ELF
> file. Then only problem is assembler in gcc assumed ".note" section as
> "aw" (allocate/write) as default property, but actually, the .note
> section can be only marked with "a" (note section is readonly). If I
> modify the temporary .s export by gcc assembler by delete "w" property,
> the warning is disappeared.

Did you try making priv_dat const?

Adam

RE: About the gcc Warning: setting incorrect section attributes for .note

[XU SHENG]

Hi Adam,
	It's OK. Thanks. 



Best Regards,
Edison

-----Original Message-----
From: Adam Nemet [mailto:anemet@caviumnetworks.com] 
Sent: 2008年5月22日 15:03
To: XU SHENG
Cc: gcc@gcc.gnu.org
Subject: Re: About the gcc Warning: setting incorrect section attributes for .note

"XU SHENG" <Sheng.Xu@alcatel-lucent.com> writes:
> 	int priv_dat  __attribute__ ((section(".note"))) = MAGIC;
>
...
>
> 	It's clear to me that only section marked attribute with the startup 
> of ".note" can be compiled to section with type SHT_NOTE in ELF file. 
> Then only problem is assembler in gcc assumed ".note" section as "aw" 
> (allocate/write) as default property, but actually, the .note section 
> can be only marked with "a" (note section is readonly). If I modify 
> the temporary .s export by gcc assembler by delete "w" property, the 
> warning is disappeared.

Did you try making priv_dat const?

Adam