[Buildroot] binutils doesn't like -elf2flt option

Arnout Vandecappelle arnout at mind.be
Mon Jun 17 06:22:50 UTC 2013

On 06/15/13 12:26, Adam Nielsen wrote:
> Hi all,
> I'm trying to compile a toolchain with elf2flt enabled, but I'm having
> problems getting binutils to compile.
> Normally the parameter "-W,-elf2flt" is passed to GCC to tell it to pass
> "-elf2flt" to the linker.  elf2flt then picks this up and does what it
> needs to, courtesy of a wrapper script around "ld".  I have set this
> parameter in TARGET_CFLAGS in one of the buildroot makefiles.
> However when I am compiling binutils, it seems that elf2flt has not been
> installed yet, so it is not recognising the -elf2flt option, and gives me
> this error:
> arm-buildroot-linux-uclibcgnueabi-gcc -o conftest -D_LARGEFILE_SOURCE
> -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -pipe -Os  -Wl,-elf2flt
> -DBR_BINFMT_FLAT   --static -Wl,-rpath -Wl,/foo conftest.c  >&5
> arm-buildroot-linux-uclibcgnueabi/bin/ld: warning: cannot find entry
> symbol lf2flt; defaulting to 00000000000080c0
> I think binutils needs to use elf2flt, otherwise any binaries it produces
> will not be in BFLT format, so I am guessing I need to tell buildroot to
> compile elf2flt before binutils.  Does this sound correct?  Is it even
> possible to compile something like that before binutils?  Or do I have to
> somehow avoid passing the -elf2flt parameter to binutils?  How might one
> achieve this?

  elf2flt already depends on binutils (it uses libbfd), so this won't 
work. And as Thomas mentioned, this is only relevant for target-binutils 
(which you probably don't even need).

  However, it looks like there is no explicit dependency on elf2flt when 
building the toolchain. Probably elf2flt should be added to BASE_TARGETS, 
to make sure it gets built before all the rest.


Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
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