[Bug target/69685] New: GCC cross compiler build failed

["pieter.cardoen at hotmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69685

            Bug ID: 69685
           Summary: GCC cross compiler build failed
           Product: gcc
           Version: 4.9.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pieter.cardoen at hotmail dot com
  Target Milestone: ---

Created attachment 37591
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37591&action=edit
Console output

Dear

I am trying to build gcc 4.9.3 for target avr-unknown-elf. If I build it, it
seems that the build hangs on this item:

/home/test02/build-gcc/./gcc/xgcc -B/home/test02/build-gcc/./gcc/
-B/usr/local/g
cc-4.9.3-avr-unknown-elf/avr-unknown-elf/bin/
-B/usr/local/gcc-4.9.3-avr-unknown
-elf/avr-unknown-elf/lib/ -isystem
/usr/local/gcc-4.9.3-avr-unknown-elf/avr-unkn
own-elf/include -isystem
/usr/local/gcc-4.9.3-avr-unknown-elf/avr-unknown-elf/sy
s-include    -g -O2 -O2  -g -O2 -DIN_GCC  -DCROSS_DIRECTORY_STRUCTURE  -W -Wall
-Wno-narrowing -Wwrite-strings -Wcast-qual -Wstrict-prototypes
-Wmissing-prototy
pes -Wold-style-definition  -isystem ./include   -DDF=SF -Dinhibit_libc
-mcall-p
rologues -Os -g -DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector
-Dinhibit_li
bc  -DDF=SF -Dinhibit_libc -mcall-prologues -Os -I. -I. -I../.././gcc
-I../../..
/gcc-4.9.3/libgcc -I../../../gcc-4.9.3/libgcc/.
-I../../../gcc-4.9.3/libgcc/../g
cc -I../../../gcc-4.9.3/libgcc/../include  -DHAVE_CC_TLS -DUSE_EMUTLS -o
_satfra
ctHQUSQ.o -MT _satfractHQUSQ.o -MD -MP -MF _satfractHQUSQ.dep -DL_satfract
-DFRO
M_HQ -DTO_USQ -c ../../../gcc-4.9.3/libgcc/fixed-bit.c -fvisibility=hidden
-DHID
E_EXPORTS

A console screenshot has been added to this thread. What's the reason that this
problem occurs and how can I debug this kind of issues?

I use these packages:
gcc-4.9.3
mpfr-3.1.3
gmp-6.1.0
mpc-1.0.3
isl-0.14
binutils-2.22.90
newlib-2.2.0


Thanks
Pieter