Libgcc2 compilation

[umar janjua]

During the porting of gcc to new target , the make process fails at 

ake[2]: *** [libgcc/./_lshrdi3.o] Error 1
make[2]: Leaving directory `/usr/local/src/gnu/BUILD3.1/gcc/gcc'
make[1]: *** [libgcc.a] Error 2

Earlier the gcc failed at _negdi2.o building, which was corrected by adding
negdi2 entry in the macro

#define INIT_TARGET_OPTABS \
  do { \
	.....
    smul_optab->handlers[(int) QImode].libfunc		\
      = init_one_libfunc (MULQI3_LIBCALL);		\
	neg_optab->handlers[(int) QImode].libfunc		\
      = init_one_libfunc (NEGDI2_LIBCALL);			\
.....
	  } while (0)


However i do not want to do the same thing for l_shrdi3 error. Gcc should
compile the libgcc2.c correctly containing functions like _negdi2, l_shrdi3
and so on. How to do so..