How to put a lib in specifiled postion (gcc arm)?

Hi 孙华,

In the extract you gave, FLASH_LIB starts at 0x400 (see ORIGIN) rather than 0x1000. Is it a typo when copying or the value is the same in your real code?

Best regards.

Hi Thomas Preud'homme (thomas-preudhomme),

   Thanks for your Promption.
   I correct the mistake.
   :-)

Hi Thomas Preud'homme (thomas-preudhomme),

   Thanks for your Promption.
   I correct the mistake.
   :-)

Hi 孙华,

Can you show how you link your application and what is the output of readelf -S ?

Best regards.

Hi Thomas Preud'homme (thomas-preudhomme),

  I‘m sorry.
  I can't copy the link file and the ouput , because the program is in intranet pc .

  But i will do my best to let you know the phenomenon .

  I know that lib is located at FLASH section from the map file and the lib section is null.
  How to change the linker file ?

Best regards.

Hi 孙华,

Can you try with "libxx.a: (.text, .rodata)" (ie adding a colon after the name of the library)?

Best regards.

Hi Thomas Preud'homme (thomas-preudhomme),

  I‘m sorry.
  It does't work.

Best regards.

Hi,

I'm not sure whether a comma can be included when specifying the input sections. Can you try:

   lib :
   {
       libxx.a (.text .rodata)
   } > FLASH_LIB

If it still does'nt work maybe you can try libxx.a:*.

Best regards

Hi Thomas Preud'homme (thomas-preudhomme),

   I tryed both methods, but all failed .
   Does it support to put a libxx.a in a specifiled postion?

   I know ARM MDK scatter just put many xx.o (+RO) (xx.o is one of obj in lib),
 and then lib is puted in a a specifiled postion.

Best regards.

Hi 孙华,

Yes, this toolchain allows to control where a code will be found in memory. It's a bit difficult to debug without being able to reproduce. Let's try something simpler. Select one of the file in your archive that contains a .text section (I'll suppose the file is foo.o). Then rewrite the lib output section to:

.lib :
{
  libxx.a:foo.o (.text)
} > FLASH_LIB

And look if the .text of the foo.o file in libxx.a is in .lib section of the output file. If not there is something really strange going on as this is an almost direct example from the documentation.

Best regards.

Hi Thomas Preud'homme (thomas-preudhomme),

   I have tryed again, but failed .
   Foo.o file stills in .text section ( > FLASH) not in .lib section （〉FLASH_LIB）.

Best regards.

Can you also try to replace *(.text*) with *(EXCLUDE_FILE (libxx.a:*) .text) from the FLASH output section?

If it still does not work, what about using *libxx.a:foo.o?

Best regards,

Thomas

Hi Thomas Preud'homme (thomas-preudhomme),

    It also does't work .It's so strange,why does't work on libxx.a?
    Is there somebody do like that successfully?

    Thanks for your kind help！

Best regards.

Hi Thomas Preud'homme (thomas-preudhomme),

SECTIONS
{
...

   lib :
   {
      not_in_lib.o (.text, .rodata)
   } > FLASH_LIB

  .text :
  {
    *(EXCLUDE_FILE (not_in_lib.o) .text*)
    *(.rodata*)
  } 〉FLASH

...

}

 I know not_in_lib.o is in lib section by read map file .

Best regards.

Alright, that's progress. So now try to remove the EXCLUDE_FILE and see if it still works. If yes, try to put not_in_lib.o into its own archive (with only one member) and see if it works. By building progressively we'll figure out what's missing in the syntax.

Best regards.

Hi Thomas Preud'homme (thomas-preudhomme),

when remove the EXCLUDE_FILE , it stall works(Becase FLASH_LIB section is front of .text section).

  foo.o is a obj file cheated by a lib project , not one of the member in libxx.a.
  I have tryed below case ( *(EXCLUDE_FILE ( libxx.a:foo.o) .text*) or *(.text*)) , the result is same.
(many mulitiple definition of 'xxx',because lib section links a foo.o and .text section links libxx.a(contain foo.o))

SECTIONS
{
...

   lib :
   {
      foo.o (.text)
   } > FLASH_LIB

  .text :
  {
    *(EXCLUDE_FILE ( libxx.a:foo.o) .text*) or *(.text*)
    *(.rodata*)
  } 〉FLASH

...

}

It semms some operations of libxx.a have been ignored.

Best regards.

Hi Thomas Preud'homme (thomas-preudhomme),

when remove the EXCLUDE_FILE , it stall works(Becase FLASH_LIB section is front of .text section).

  foo.o is a obj file cheated by a lib project , not one of the member in libxx.a.
  I have tryed below case ( *(EXCLUDE_FILE ( libxx.a:foo.o) .text*) or *(.text*)) , the result is same.
(many mulitiple definition of 'xxx',because lib section links a foo.o and .text section links libxx.a(contain foo.o))

SECTIONS
{
...

   lib :
   {
      foo.o (.text)
   } > FLASH_LIB

  .text :
  {
    *(EXCLUDE_FILE ( libxx.a:foo.o) .text*) or *(.text*)
    *(.rodata*)
  } 〉FLASH

...

}

It semms some operations of libxx.a have been ignored.

Best regards.

Hi Thomas Preud'homme (thomas-preudhomme),
   The correct method is like following code.

SECTIONS
{
...
   lib :
   {
      *foo.o (.text .rodata)
   } > FLASH_LIB
  .text :
  {
    *(.text*)
    *(.rodata*)
  } 〉FLASH
...

Thanks for your help again!
Best regards.

}