Re: [Xen-devel] [SeaBIOS] [PATCH v2] ld: don't hardcode "-melf_i386"

[Idwer Vollering <vidwer@xxxxxxxxx>]

2014-04-16 14:38 GMT+02:00 Idwer Vollering <vidwer@xxxxxxxxx>:
> 2014-04-16 9:14 GMT+02:00 Roger Pau Monne <roger.pau@xxxxxxxxxx>:
>> On FreeBSD, the name of the emulation is "-melf_i386_fbsd", so allow
>> SeaBIOS to fetch the emulation to use from the environment variables.
>>
>> This allows SeaBIOS to compile on FreeBSD with gcc.
>
>> +LD32BIT_FLAG:=-melf_i386
>
> That will not work, see below for proof.
>
> With your patch applied, on FreeBSD 10.0-RELEASE and gcc 4.7.3
> installed from ports:
>
>>   Building ld scripts
>> ./scripts/buildversion.sh out/version.c
>> Version: rel-1.7.4-86-g028f348-dirty-20140416_140430-machete
>> gcc -Iout/ -Isrc -Os -MD -g -Wall -Wno-strict-aliasing 
>> -Wold-style-definition -Wtype-limits -m32 -march=i386 -mregparm=3 
>> -mpreferred-stack-boundary=2 -minline-all-stringops -freg-struct-return 
>> -ffreestanding -fno-delete-null-pointer-checks -ffunction-sections 
>> -fdata-sections -fno-common  -fno-stack-protector  -DMODE16=0 
>> -DMODESEGMENT=0 -fomit-frame-pointer -c out/version.c -o out/version.o
>> ld -melf_i386 -r out/ccode32flat.o out/version.o -o out/code32flat.o
>> ld: unrecognised emulation mode: elf_i386
>> Supported emulations: elf_x86_64_fbsd elf_i386_fbsd
>> gmake: *** [out/romlayout16.lds] Error 1
>
> With 'LD32BIT_FLAG:=-melf_i386_fbsd':
>
>>   Building ld scripts
>> ./scripts/buildversion.sh out/version.c
>> Version: rel-1.7.4-86-g028f348-dirty-20140416_140652-machete
>> gcc -Iout/ -Isrc -Os -MD -g -Wall -Wno-strict-aliasing 
>> -Wold-style-definition -Wtype-limits -m32 -march=i386 -mregparm=3 
>> -mpreferred-stack-boundary=2 -minline-all-stringops -freg-struct-return 
>> -ffreestanding -fno-delete-null-pointer-checks -ffunction-sections 
>> -fdata-sections -fno-common  -fno-stack-protector  -DMODE16=0 
>> -DMODESEGMENT=0 -fomit-frame-pointer -c out/version.c -o out/version.o
>> ld -melf_i386_fbsd -r out/ccode32flat.o out/version.o -o out/code32flat.o
>> ld -melf_i386_fbsd -r out/ccode16.o out/romlayout.o -o out/code16.o
>
> And:
>
>> $ gcc47 -dumpspecs | grep elf_i386
>> %{!static:--eh-frame-hdr}   %{m32:-m elf_i386_fbsd}   %{p:%nconsider using 
>> '-pg' instead of '-p' with gprof(1)}   %{v:-V}   %{assert*} %{R*} %{rpath*} 
>> %{defsym*}   %{shared:-Bshareable %{h*} %{soname*}}     %{!shared:       
>> %{!static:         %{rdynamic:-export-dynamic}  -dynamic-linker 
>> %(fbsd_dynamic_linker) }     %{static:-Bstatic}}   %{symbolic:-Bsymbolic}

False alarm, I had to override the linker with LD=/usr/local/bin/ld.

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