[Buildroot] building ARM toolchain with nofpu

[James Newell <jnewell@wgate.com>]

Has any one had any progress with building uclibc default soft float
using gcc 4.1.1?

Thanks,
Jim

On Thu, 2007-02-01 at 20:15 +0100, Yann E. MORIN wrote:
> Hello all!
> Michel, Carl.
> 
> On Thursday 01 February 2007 010, Michel Benoit wrote:
> > I'm trying to build a toolchain with soft floating point enabled for
> > ARM arm26t target platform.  I'm doing this in order to build u-boot
> > for my target.
> [--SNIP--]
> > The build stops due to missing symbols while linking uclibc:
> > 
> > make[1]: Entering directory
> > `/home/michel/Projects/sepab/exyplus/sw/bsp/build/buildroot/toolchain_build_arm_nofpu/uClibc'
> >   LD libuClibc-0.9.29.so
> > libc/libc_so.a(difftime.os): In function `difftime':
> > difftime.c:(.text+0x8): undefined reference to `__floatsidf'
> > difftime.c:(.text+0x2c): undefined reference to `__subdf3'
> > libc/libc_so.a(_fpmaxtostr.os): In function `_fpmaxtostr':
> > _fpmaxtostr.c:(.text+0xd4): undefined reference to `__nedf2'
> > _fpmaxtostr.c:(.text+0xf8): undefined reference to `__eqdf2'
> > _fpmaxtostr.c:(.text+0x114): undefined reference to `__divdf3'
> > _fpmaxtostr.c:(.text+0x120): undefined reference to `__ltdf2'
> > _fpmaxtostr.c:(.text+0x1c4): undefined reference to `__muldf3'
> > _fpmaxtostr.c:(.text+0x388): undefined reference to `__gedf2'
> > _fpmaxtostr.c:(.text+0x430): undefined reference to `__adddf3'
> > libc/libc_so.a(__psfs_do_numeric.os): In function `__psfs_do_numeric':
> > __psfs_do_numeric.c:(.text+0x520): undefined reference to `__truncdfsf2'
> > libc/libc_so.a(strtof.os): In function `strtof':
> > strtof.c:(.text+0x1c): undefined reference to `__extendsfdf2'
> > /home/michel/Projects/sepab/exyplus/sw/bsp/build/buildroot/build_arm_nofpu/staging_dir/lib/gcc/arm-linux-uclibc/4.1.1/libgcc.a(_fixunsdfsi.o):
> > In function `__fixunsdfsi':
> > libgcc2.c:(.text+0x34): undefined reference to `__fixdfsi'
> > make[2]: *** [lib/libc.so] Error 1
> > make[1]: *** [lib/libc.so.0] Error 2
> > make[1]: Leaving directory
> > `/home/michel/Projects/sepab/exyplus/sw/bsp/build/buildroot/toolchain_build_arm_nofpu/uClibc'
> > make: *** [/home/michel/Projects/sepab/exyplus/sw/bsp/build/buildroot/toolchain_build_arm_nofpu/uClibc/lib/libc.a]
> > Error 2
> 
> I'm tracking this down right now, and I've found that those functions are not
> included in libgcc.a because gcc-4.1.1/gcc/config.gcc does not validate
> arm/t-arm-elf for arm*-linux* targets, but arm/t-arm, which does not describe
> those functions as to be included in libgcc.a.
> 
> I've tried a quick fix (replacing t-arm with t-arm-elf), but it still does
> not work. I haven't had time right to investigate more. Later tongiht.
> 
> > Are there any other config options that need to be selected/unselected
> > in order to get this to work?
> 
> You could try with a known working gcc (gcc-3.4.4 is working real fine here),
> unless you really can't for very good reasons, but compiling u-boot should
> Just Work (TM).
> 
> Regards,
> Yann E. MORIN.
>