Visitor II

Question

Excluding unreference code with GNU ARM tool-chain

Forum|Forum|21 years ago
February 18, 2005
9 replies
1701 views

Posted on February 18, 2005 at 06:39

This topic has been closed for replies.

C

chriswAuthor

Visitor II

Posted on November 04, 2004 at 08:15

Hi,

I was wondering if anyone could help!

I'm trying to build a project that excludes unreference code! To do this I'm using a combination of -ffunction-sections and --gc-sections, with the arm-elf-gcc and arm-elf-ld, respectively.

Although the -ffunction-sections seems to work (in that I can place each function into it own section), the --gc-sections seems to then exclude all of the code, including this in object files that weren't built with -ffunction-sections!

Does anyone know if the --gc-sections option works with the arm-elf-ld version 2.13.1.

I'd be grateful of any help!!!

G

gianfranco2

Visitor II

Posted on November 04, 2004 at 13:03

Hi,

I'm sorry I don't know help you but I think you can help me.

I would like to use STR71x eval.board but I cannot buy the RVDK tools. I see you're using the free tool gc.

Could you tell me which JTAG-TO-USB hardware part I have to build to use it with this free C compiler and debugger tools?

Bye and tks.

S

sjo

Visitor II

Posted on November 04, 2004 at 17:33

If ld finds no reference to a section it will not include it - to overcome this use the KEEP keyword in the linker script.

Also the company I work for Anglia (www.angliac.com) is just releasing a gcc based toolchain and a STR71x dev board (with detachable jtag interface), the gcc toolchain (v3.4.1) includes an IDE to wrap gcc and debugging using gdb insight.

The toolchain is the standard gcc release except - newlib has been built with -ffunction-sections and -fdata-sections to reduce code size. Also STR71x lib has been included as a pre built library.

The toolchain is free but requires user registration.

Regards

sjo

[ This message was edited by: sjo on 04-11-2004 22:05 ]

R

richard7

Visitor II

Posted on November 11, 2004 at 10:47

Do you have any more info on this Dev Board (Timescale, Price,etc ?) It sounds very interesting. How does it compare with the STR71x Eval ?

rjr

Quote:

On 2004-11-04 22:03, sjo wrote:

If ld finds no reference to a section it will not include it - to overcome this use the KEEP keyword in the linker script.

Also the company I work for Anglia (www.angliac.com) is just releasing a gcc based toolchain and a STR71x dev board (with detachable jtag interface), the gcc toolchain (v3.4.1) includes an IDE to wrap gcc and debugging using gdb insight.

The toolchain is the standard gcc release except - newlib has been built with -ffunction-sections and -fdata-sections to reduce code size. Also STR71x lib has been included as a pre built library.

The toolchain is free but requires user registration.

Regards

sjo

[ This message was edited by: sjo on 04-11-2004 22:05 ]

S

sjo

Visitor II

Posted on November 16, 2004 at 08:03

Have a look at

http://www.angliac.com/newsarchive/828.asp

Toolchain/ide is available now, board available very very soon.

Regards

sjo

C

chriswAuthor

Visitor II

Posted on December 02, 2004 at 07:44

Sorry it's taken me so long to reply - but we're using the Ashling tools, which are based on the gnu elf tool-chain. And it runs from AsIDE, a windows dos command shell assuming cygwin is installed, and I assume from a cygwin bash shell (but have tried it!). I think the basic ARM gnu tool-chain is free, and is probably downloadable as a package from the cygwin site - although I haven't tried to do that! The Ashling stuff cost just over 2000 euros.

The problem I had linking code dependent code was solved by using the directive KEEP in the link definition file, eg.

SECTIONS

{

.text:

{

/* links all dependent function sections associated with -ffunction-sections */

*(.text.*)

/* keeps all other sections, i.e. where -ffunction-sections isn't used to compile an object *./

KEEP(*(.text))

}

S

sjo