Convert GC source files to valid C++ code

Convert GC source files to valid C++ code

Issue #206 (bdwgc).

* alloc.c (GC_copyright): Change type from char* const to
const char* const.
* alloc.c (GC_set_fl_marks, GC_clear_fl_marks, GC_finish_collection,
GC_allocobj): Add missing explicit casts from void* to ptr_t.
* backgraph.c [MAKE_BACK_GRAPH] (add_back_edges): Likewise.
* blacklst.c (GC_default_print_heap_obj_proc,
GC_print_blacklisted_ptr): Likewise.
* dbg_mlc.c (GC_get_back_ptr_info, GC_store_debug_info_inner,
GC_store_debug_info, GC_debug_malloc, GC_debug_malloc_ignore_off_page,
GC_debug_malloc_atomic_ignore_off_page, GC_debug_generic_malloc,
GC_debug_malloc_stubborn, GC_debug_malloc_atomic,
GC_debug_malloc_uncollectable, GC_debug_malloc_atomic_uncollectable,
GC_debug_free, GC_debug_free_inner, GC_debug_register_finalizer,
GC_debug_register_finalizer_no_order,
GC_debug_register_finalizer_unreachable,
GC_debug_register_finalizer_ignore_self): Likewise.
* finalize.c (GC_grow_table, push_and_mark_object,
ensure_toggleref_capacity, GC_dump_finalization_links,
GC_dump_finalization, GC_make_disappearing_links_disappear,
GC_remove_dangling_disappearing_links, GC_finalize): Likewise.
* gcj_mlc.c (GC_gcj_malloc, GC_debug_gcj_malloc,
GC_gcj_malloc_ignore_off_page): Likewise.
* include/private/gc_pmark.h (PUSH_CONTENTS_HDR): Likewise.
* mallocx.c (GC_memalign): Likewise.
* mark.c (GC_mark_from, GC_mark_and_push, GC_push_all_eager,
GC_push_all_stack, GC_push_marked1, GC_push_marked2, GC_push_marked4):
Likewise.
* mark_rts.c (GC_exclude_static_roots_inner): Likewise.
* misc.c (GC_base): Likewise.
* new_hblk.c (GC_new_hblk): Likewise.
* pthread_support.c (GC_register_altstack, GC_thr_init,
GC_record_stack_base): Likewise.
* ptr_chck.c (GC_is_visible): Likewise.
* reclaim.c (GC_reclaim_small_nonempty_block,
GC_disclaim_and_reclaim_or_free_small_block): Likewise.
* thread_local_alloc.c (GC_mark_thread_local_fls_for): Likewise.
* typd_mlc.c (GC_typed_mark_proc,
GC_malloc_explicitly_typed_ignore_off_page): Likewise.
* win32_threads.c (GC_record_stack_base, GC_get_stack_min,
GC_push_stack_for): Likewise.
* blacklst.c (GC_copy_bl): Rename "new" argument to "dest".
* dbg_mlc.c (GC_store_debug_info_inner, GC_print_smashed_obj): Change
type of p argument from ptr_t to void*.
* include/private/gc_priv.h (GC_is_heap_base, GC_is_static_root):
Likewise.
* mark_rts.c [!THREADS] (GC_is_static_root): Likewise.
* os_dep.c (GC_is_malloc_heap_base, GC_is_heap_base): Likewise.
* ptr_chck.c (GC_on_stack): Likewise.
* dbg_mlc.c (GC_print_obj): Change type of kind_str local variable
from char* to const char*.
* dbg_mlc.c (GC_debug_strdup, GC_debug_strndup): Cast result of
GC_debug_malloc_atomic() to char*.
* mallocx.c (GC_strdup, GC_strndup): Likewise.
* dbg_mlc.c (GC_debug_wcsdup): Cast result of GC_debug_malloc_atomic()
to wchar_t*.
* mallocx.c (GC_wcsdup): Likewise.
* dyn_load.c [MSWIN32 || MSWINCE || CYGWIN32]
(GC_register_dynamic_libraries): Cast p local variable to char*.
* os_dep.c (GC_register_data_segments): Likewise.
* fnlz_mlc.c [ENABLE_DISCLAIM] (GC_finalized_disclaim): Cast masked
fc_word to struct GC_finalizer_closure* (instead of void*).
* fnlz_mlc.c [ENABLE_DISCLAIM] (GC_finalized_malloc): Cast result of
GC_malloc_kind() to word*.
* typd_mlc.c (GC_malloc_explicitly_typed, GC_calloc_explicitly_typed):
Likewise.
* include/private/gc_priv.h (WARN): Cast away const qualifier for msg
(and the string literal).
* misc.c (GC_default_on_abort): Remove cast to void* for WRITE()
buf argument.
* misc.c (GC_new_free_list_inner): Cast result local variable to void**.
* misc.c (GC_new_free_list): Change type of result local variable from
void* to void**.
* pthread_support.c (GC_start_rtn_prepare_thread): Cast arg to
struct start_info*.
* win32_threads.c [GC_PTHREADS] (GC_pthread_start_inner): Likewise.
* reclaim.c (GC_print_free_list): Replace ptr_t flh to void *flh_next
local variable; remove redundant casts.
* tools/if_mach.c (EXECV_ARGV_T): New macro; add comment.
* tools/if_not_there.c (EXECV_ARGV_T): Likewise.
* tools/if_mach.c (main): Use EXECV_ARGV_T instead of void* for
execvp() argument.
* tools/if_not_there.c (main): Likewise.
* typd_mlc.c (LeafDescriptor, ComplexArrayDescriptor,
SequenceDescriptor): Move struct definition out of union
ComplexDescriptor.
* typd_mlc.c (GC_add_ext_descriptor): Rename "new" local variable to
newExtD.
* win32_threads.c (GC_CreateThread, GC_beginthreadex): Cast result
of GC_malloc_uncollectable() to thread_args*.
* win32_threads.c [PARALLEL_MARK && !MSWINCE && __cplusplus]
(GC_thr_init): Do not cast GetProcessAffinityMask() arguments to void*.