This patch (C) 2007 Yann E. MORIN

 Licensed under GPL v2.

 First hunk of this patch solves compiling uClibc:

 make[1]: Entering directory `/home/ymorin/x-tools/build/armeb-unknown-linux-uclibc/gcc-4.1.1-uClibc-0.9.28.1/build-libc'

   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/ymorin/x-tools/build/armeb-unknown-linux-uclibc/gcc-4.1.1-uClibc-0.9.28.1/cc_core_prefix/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/ymorin/x-tools/build/armeb-unknown-linux-uclibc/gcc-4.1.1-uClibc-0.9.28.1/build-libc'

 make: *** [/home/ymorin/x-tools/build/armeb-unknown-linux-uclibc/gcc-4.1.1-uClibc-0.9.28.1/build-libc/lib/libc.a]

 Error 2

 The second hunk fixes building final gcc because soft-float implies using -lfloat (which we don't have).

 diff -dur gcc-4.2.0.orig/gcc/config.gcc gcc-4.2.0/gcc/config.gcc

 --- gcc-4.2.0.orig/gcc/config.gcc	2007-07-15 11:24:18.000000000 +0200

 +++ gcc-4.2.0/gcc/config.gcc	2007-07-15 11:26:02.000000000 +0200

 @@ -721,7 +721,7 @@

  	    default_use_cxa_atexit=yes

  	    ;;

  	*)

 -	    tmake_file="$tmake_file arm/t-linux"

 +	    tmake_file="$tmake_file arm/t-linux arm/t-arm-elf"

  	    ;;

  	esac

  	tm_file="$tm_file arm/aout.h arm/arm.h"

 diff -dur gcc-4.2.0.orig/gcc/config/arm/linux-elf.h gcc-4.2.0/gcc/config/arm/linux-elf.h

 --- gcc-4.2.0.orig/gcc/config/arm/linux-elf.h	2007-07-15 11:24:18.000000000 +0200

 +++ gcc-4.2.0/gcc/config/arm/linux-elf.h	2007-07-15 11:26:02.000000000 +0200

 @@ -63,7 +63,7 @@

     %{shared:-lc} \

     %{!shared:%{profile:-lc_p}%{!profile:-lc}}"

 -#define LIBGCC_SPEC "%{msoft-float:-lfloat} %{mfloat-abi=soft*:-lfloat} -lgcc"

 +#define LIBGCC_SPEC "-lgcc"

  #define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"