Error while cross compiling gcc-4.4.0

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Hi all,   
  I am trying to cross compile gcc-4.4.0 on my i486-linux-gnu platform for a mipsel-linux machine.   
  Firstly,I am trying to compile a core gcc:  
  (1) ../$GCC_SRC/configure --prefix=$PREFIX  --with-gmp=$GMP --with-mpfr=$MPFR --target=mipsel-linux --enable-languages=c --disable-shared --disable-threads  
  (2)make all-gcc  
  (3)make install-gcc  
  and until now,there is no problems,and the following is my error:  
  (4)make all-target-libgcc  
  it reports:  "checking for suffix of object files...   configure: error: cannot compute suffix of object files: cannot compile"  
  in config.log of libgcc,when it tries to compile conftest.c using xgcc,it reports "exec: 78: : Permission denied".  
  But when I go to the directory of xgcc and type "./xgcc",it reports "no input files" correctly.  
  So anyone has any suggestions?  
  Thanks.


    



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