GMP and MPFR are no longer a sub-component of gcc (config-wise).
Build and install GMP and MPFR for the target.
Use the target GMP and MPFR to build the native gdb.
Have separate extra_config for cross gdb, native gdb and gdbserver.
Check native GMP and MPFR in //.

/trunk/scripts/build/debug/300-gdb.sh | 27 19 8 0 ++++++++++++++++-------
/trunk/scripts/build/gmp.sh | 47 39 8 0 ++++++++++++++++++++++++++++++++-------
/trunk/scripts/build/mpfr.sh | 49 40 9 0 +++++++++++++++++++++++++++++++++--------
/trunk/steps.mk | 2 2 0 0 ++
/trunk/config/cc/gcc.in | 18 1 17 0 +--------------
/trunk/config/debug/gdb.in | 6 1 5 0 +----
/trunk/config/config.in | 1 1 0 0 +
/trunk/config/gmp_mpfr.in | 34 34 0 0 ++++++++++++++++++++++++++++
8 files changed, 137 insertions(+), 47 deletions(-)

 # C library options

 menu "C-library"

 choice

     bool

     prompt "C-library to use:"

     default LIBC_GLIBC

 config LIBC_GLIBC

     bool

     prompt "glibc"

     select LIBC_SUPPORT_NPTL

     select LIBC_SUPPORT_LINUXTHREADS

 config LIBC_UCLIBC

     bool

     prompt "uClibc"

     select LIBC_SUPPORT_LINUXTHREADS

 endchoice

 config LIBC_VERSION

     string

 config LIBC

     string

     default "glibc" if LIBC_GLIBC

     default "uClibc" if LIBC_UCLIBC

 config LIBC_SUPPORT_NPTL

     bool

     default n

 config LIBC_SUPPORT_LINUXTHREADS

     bool

     default n

 if LIBC_GLIBC

 source config/libc/glibc.in

 endif

 if LIBC_UCLIBC

 source config/libc/uClibc.in

 endif

 endmenu