[fpc-pascal] Using arm-embedded-fpc

[Michael Ring]

I think I remember that we had a discussion on build-id before, it did 
not work on linux but I thought that Florian has created a fix and I 
think I have verified that it works after that on my linux system.

Are you on Linux? And using trunk compiler? If you do not use trunk then 
please try to use it, hopefully the fix is in there.

Michael


Am 23.10.13 17:58, schrieb Koenraad Lelong:
> op 23-10-13 13:54, Jonas Maebe schreef:
>>
>> On 23 Oct 2013, at 12:05, Koenraad Lelong wrote:
>>
>>> fpc at linux:~/src-arm-fpc> fpc -Parm -Tembedded -Wplpc2124 -sh tled1.pp
>>> Free Pascal Compiler version 2.7.1 [2013/10/23] for arm
>>> Copyright (c) 1993-2013 by Florian Klaempfl and others
>>> Target OS: Embedded
>>> Compiling tled1.pp
>>> tled1.pp(54,4) Fatal: Can't open executable tled1.elf
>>> Fatal: Compilation aborted
>>> Error: /usr/bin/ppcrossarm returned an error exitcode (normal if you
>>> did not specify a source file to be compiled)
>>
>> Can you try again after applying the attached patch?
>>
>>
>> Jonas
>>
> Thanks Jonas,
>
> Now I can use -sh. The resulting ppas.sh :
>
> #!/bin/sh
> DoExitAsm ()
> { echo "An error occurred while assembling $1"; exit 1; }
> DoExitLink ()
> { echo "An error occurred while linking $1"; exit 1; }
> echo Assembling program
> /usr/bin/arm-embedded-as -mfpu=softvfp -o tled1.o tled1.s
> if [ $? != 0 ]; then DoExitAsm program; fi
> rm tled1.s
> echo Linking tled1
> OFS=$IFS
> IFS="
> "
> /usr/bin/arm-embedded-ld -g  --build-id   --gc-sections  -L. -o 
> tled1.elf -T link.res
> if [ $? != 0 ]; then DoExitLink tled1; fi
> IFS=$OFS
> echo Linking tled1
> OFS=$IFS
> IFS="
> "
> /usr/bin/arm-embedded-objcopy -O ihex tled1.elf tled1.hex
> if [ $? != 0 ]; then DoExitLink tled1; fi
> IFS=$OFS
>
> Tinkering with it I found --build-id gives my problem. If that is 
> removed, there are no errors.
> But I also analyzed link.res :
> SEARCH_DIR("/usr/lib/fpc/2.7.1/units/arm-embedded/rtl/")
> SEARCH_DIR("/usr/lib/fpc/2.7.1/")
> INPUT (
> tled1.o
> /usr/lib/fpc/2.7.1/units/arm-embedded/rtl/system.o
> /usr/lib/fpc/2.7.1/units/arm-embedded/rtl/lpc21x4.o
> )
> ENTRY(_START)
> MEMORY
> {
>     flash : ORIGIN = 0x00000000, LENGTH = 0x00040000
>     ram : ORIGIN = 0x40000000, LENGTH = 0x00004000
> }
> _stack_top = 0x40004000;
> SECTIONS
> {
>      .text :
>     {
>     _text_start = .;
>     KEEP(*(.init, .init.*))
>     *(.text, .text.*)
>     *(.strings)
>     *(.rodata, .rodata.*)
>     *(.comment)
>     _etext = .;
>     } >flash
>     .note.gnu.build-id : { *(.note.gnu.build-id) }
>     .data :
>     {
>     _data = .;
>     *(.data, .data.*)
>     KEEP (*(.fpc .fpc.n_version .fpc.n_links))
>     _edata = .;
>     } >ram AT >flash
>     .bss :
>     {
>     _bss_start = .;
>     *(.bss, .bss.*)
>     *(COMMON)
>     } >ram
> . = ALIGN(4);
> _bss_end = . ;
> }
> _end = .;
>
>
> Deducing from the error-message :
> /usr/bin/arm-embedded-ld: error: no memory region specified for 
> loadable section `.note.gnu.build-id'
>
> in ppas.sh I modified the line
>     .note.gnu.build-id : { *(.note.gnu.build-id) }
> to
>     .note.gnu.build-id : { *(.note.gnu.build-id) } >flash
>
> Then ppas.sh reports no errors.
>
> I modified compiler/systems/t_embed.pas to have that line, and then 
> the compilation of tled1 without -sh produces a tled1.elf. And the 
> disassembled tled1.elf seems to be the program when comparing with a 
> saved tled1.s.
>
> So, is it safe to include that '>flash' to the linking script via the 
> compiler ? Did I find a bug, or am I doing something wrong ?
>
> Thanks for your support.
>
> Koenraad
>
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