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

[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}

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