[avr-chat] order of modules to linker

[georg chambert]

Hi,

I have an issue, which i have "solved" in that it now works, but Im curious why.

 

I linked a load module where I had a library of my own (.a) and a number of

object modules.

 

I used external in the file containing main, however outside main, to get the linker to include

two ISRs that were located in the .a and one of the .o files

 

I also used directives for the Atmega8 to use internal EEPROM, EEMEM directive for declaration, and

the other constructs needed for accessing the EEPROM.

 

NOW: first time I linked my .a file was last in the list of modules;  the resulting load module didnt work.

 

I checked out the .lst usinng listing option for the .elf file; and saw a strange ting, on the position of the vector for

vector_11, there instead was written some strange address (very high) and some eeprom-information......

(vector_11 is in the m8 the address for the UART RX interrupt, which I use, and the ISR is loceted in the .a file)

 

Now I got some back-of-the-head hunch, so I re-arranged so that the .a was first in the link-list, and sure enough

the vector_11 was now a fine address to the ISR, and the load-module work (what I can see so far)

 

WHAT WAS THAT, is my question (I usuallly want to understand whats happening, otherwise things tend

to come back in some other shape and bite u)

 

/georg