[coldfire-gnu-discuss] GNU Linker

[Mats Blide]

Thank you for your help. I tried the compilerswitch and although it gave me 
som segment overlap error in the linking it atleast created a map file that 
gave me a better overview of the RAM usage.

/Mats



>From: David Brown <david at westcontrol.com>
>To: Mats Blide <matsblide at hotmail.com>
>CC: coldfire-gnu-discuss at codesourcery.com
>Subject: Re: [coldfire-gnu-discuss] GNU Linker
>Date: Wed, 17 Jan 2007 15:17:31 +0100
>
>The map file will give you a break-down by section and object file, so you 
>can at least see which object file is using the space.  If you need more 
>detail, you can always try the "-fdata-sections" option on the compiler, 
>which will put each data item in its own section.  I haven't used it 
>myself, but give it a shot.
>
>http://gcc.gnu.org/onlinedocs/gcc-4.1.1/gcc/Optimize-Options.html#index-fdata_002dsections-577
>
>mvh.,
>
>David
>
>
>Mats Blide wrote:
>>Thank's for your answer. I tried your suggestions, but they seam reluctant 
>>to give me the sizes of individual variables. What I'am looking for is 
>>something like this:
>>
>>.data       0x20000000       0x100    project/MyObjectFile.o
>>              0x20000000       0x050    MyBuffer
>>              0x20000050       0x002    MyVar
>>              0x20000052       0x048    MySomeOtherBuffer
>>
>>Now only have things like this:
>>
>>.bss           0x20003264      0x907 lwip/src/core/pbuf.o
>>
>>
>>
>>Telling me that pbuf.o consumes 0x907 bytes RAM in segment bss. And that's 
>>fair enough. But I would like to se what is using that RAM.
>>
>>/Mats
>>
>>
>>
>>
>>>From: David Brown <david at westcontrol.com>
>>>To: Mats Blide <matsblide at hotmail.com>, 
>>>coldfire-gnu-discuss at codesourcery.com
>>>Subject: Re: [coldfire-gnu-discuss] GNU Linker
>>>Date: Wed, 17 Jan 2007 11:38:06 +0100
>>>
>>>Mats Blide wrote:
>>>>
>>>>Hi,
>>>>
>>>>I don't know if this is the right forum, but I have notised that it is 
>>>>fairly active and gives quick response. So I give it a try. I'am still a 
>>>>GNU newbie.
>>>>
>>>>I'am in the process off sliming a FreeRTOS/lwIP configuration to fitt 
>>>>into my limited 32K RAM. I'am used to linkers that can produce a map 
>>>>file where I can se the size of every individual object, but I'am not 
>>>>able to figure out how to do this with GCC. As it is now it only shows 
>>>>the RAM size used by each objectfile as a whole.
>>>>
>>>>Any help appresiated highly apreceated!
>>>>
>>>>Rgds /Mats
>>>>
>>>
>>>You want something like:
>>>     -Wl,-Map=program.map
>>>
>>>and possibly
>>>     -Wl,--cref
>>>
>>>
>>>in the command line for gcc when doing the linking.
>>>
>>>Running m68k-elf-size on the elf file will also give you the sizes of the 
>>>sections, and objdump can give more details.
>>>
>>>
>>
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>

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