tree_code enum usage in hooks.c

[Ilya Enkovich]

Hello,

I need to use enum tree_code for default hook in hooks.c. I had to add
"tree.h" include into "hook.c" for that. But it caused some errors in
gcc build:

gcc   -g -fkeep-inline-functions -DIN_GCC   -W -Wall -Wwrite-strings
-Wcast-qual -Wstrict-prototypes -Wmissing-prototypes
-Wmissing-format-attribute -pedantic -Wno-long-long
-Wno-variadic-macros -Wno-overlength-strings -Wold-style-definition
-Wc++-compat -fno-common  -DHAVE_CONFIG_H  -o xgcc gcc.o ggc-none.o \
  gccspec.o driver-i386.o  libcommon-target.a libcommon.a
../libcpp/libcpp.a   ../libiberty/libiberty.a
../libdecnumber/libdecnumber.a
libcommon-target.a(hooks.o): In function `build1_stat_loc':
/export/users/ienkovic/gcc-tree-reassoc/gcc/../../gcc/gcc/tree.h:4180:
undefined reference to `build1_stat'
/export/users/ienkovic/gcc-tree-reassoc/gcc/../../gcc/gcc/tree.h:4181:
undefined reference to `tree_code_type'
/export/users/ienkovic/gcc-tree-reassoc/gcc/../../gcc/gcc/tree.h:4181:
undefined reference to `tree_code_type'
/export/users/ienkovic/gcc-tree-reassoc/gcc/../../gcc/gcc/tree.h:4182:
undefined reference to `tree_code_type'
/export/users/ienkovic/gcc-tree-reassoc/gcc/../../gcc/gcc/tree.h:4182:
undefined reference to `tree_class_check_failed'
...

So, "tree.h" inclusion requires linkage of additional objects and I do
not think it is a good idea to do it because I need enum only. I can
move this enum definition somewhere like "coretypes.h" but I'm not
sure this is the best solution. Could please anyone suggest the right
way to fix this problem?

Thanks
Ilya