* com.c (ffecom_init_0): Make double_ftype_double,
float_ftype_float, ldouble_ftype_ldouble,
ffecom_tree_ptr_to_fun_type_void local.
(tracker_head): New static variable.
(mark_tracker_head): New, marker procedure for tracker_head.
(ffecom_save_tree_forever): New procedure.
(ffecom_init_zero_): Remove obstack use.
(ffecom_make_gfrt_): Remove obstack use.
(ffecom_sym_transform_): Remove obstack use, save appropriate trees.
(ffecom_transform_common_): Remove obstack use, save appropriate
trees.
(ffecom_type_namelist_): Remove obstack use, save appropriate
trees.
(ffecom_type_vardesc_): Remove obstack use, save appropriate trees.
(ffecom_lookup_label): Remove obstack use, save appropriate trees.
(duplicate_decls): Remove obstack use.
(finish_function): push & pop ggc context around
rest_of_compilation when building nested function.
(mark_binding_level): New function.
(init_decl_processing): Mark all the GC roots.
(ggc_p): Set to 1.
(lang_mark_tree): New function.
(lang_mark_false_label_stack): New trivial function.
* com.h (ffecom_save_tree_forever): Declare as external.
* lex.c (ffelex_hash_): Use GC to allocate the filename string
even when ffelex_kludge_flag_.
* ste.c (ffeste_io_ialist_): Register a static root.
(ffeste_io_inlist_): Likewise.
(ffeste_io_icilist_): Likewise.
(ffeste_io_cllist_): Likewise.
(ffeste_io_cilist_): Likewise.
(ffeste_io_olist_): Likewise.
* Makefile.in (OBJS): Don't use ggc-callbacks.o.
(OBJDEPS): Likewise.
(GGC_H): New variable.
Update dependencies.
* where.c (ffewhere_head): New global.
(mark_ffewhere_head): New marker procedure for ffewhere_head.
(ffewhere_file_kill): Use GC to do memory management.
(ffewhere_file_new): Use GC to do memory management.
* ggc.j: New file.
From-SVN: r31142
